text: ( function () {
  
  	class ColladaLoader extends THREE.Loader {
  
  		constructor( manager ) {
  
  			super( manager );
  
  		}
  
  		load( url, onLoad, onProgress, onError ) {
  
  			const scope = this;
  			const path = scope.path === '' ? THREE.LoaderUtils.extractUrlBase( url ) : scope.path;
  			const loader = new THREE.FileLoader( scope.manager );
  			loader.setPath( scope.path );
  			loader.setRequestHeader( scope.requestHeader );
  			loader.setWithCredentials( scope.withCredentials );
  			loader.load( url, function ( text ) {
  
  				try {
  
  					onLoad( scope.parse( text, path ) );
  
  				} catch ( e ) {
  
  					if ( onError ) {
  
  						onError( e );
  
  					} else {
  
  						console.error( e );
  
  					}
  
  					scope.manager.itemError( url );
  
  				}
  
  			}, onProgress, onError );
  
  		}
  
  		parse( text, path ) {
  
  			function getElementsByTagName( xml, name ) {
  
  				// Non recursive xml.getElementsByTagName() ...
  				const array = [];
  				const childNodes = xml.childNodes;
  
  				for ( let i = 0, l = childNodes.length; i < l; i ++ ) {
  
  					const child = childNodes[ i ];
  
  					if ( child.nodeName === name ) {
  
  						array.push( child );
  
  					}
  
  				}
  
  				return array;
  
  			}
  
  			function parseStrings( text ) {
  
  				if ( text.length === 0 ) return [];
  				const parts = text.trim().split( /\s+/ );
  				const array = new Array( parts.length );
  
  				for ( let i = 0, l = parts.length; i < l; i ++ ) {
  
  					array[ i ] = parts[ i ];
  
  				}
  
  				return array;
  
  			}
  
  			function parseFloats( text ) {
  
  				if ( text.length === 0 ) return [];
  				const parts = text.trim().split( /\s+/ );
  				const array = new Array( parts.length );
  
  				for ( let i = 0, l = parts.length; i < l; i ++ ) {
  
  					array[ i ] = parseFloat( parts[ i ] );
  
  				}
  
  				return array;
  
  			}
  
  			function parseInts( text ) {
  
  				if ( text.length === 0 ) return [];
  				const parts = text.trim().split( /\s+/ );
  				const array = new Array( parts.length );
  
  				for ( let i = 0, l = parts.length; i < l; i ++ ) {
  
  					array[ i ] = parseInt( parts[ i ] );
  
  				}
  
  				return array;
  
  			}
  
  			function parseId( text ) {
  
  				return text.substring( 1 );
  
  			}
  
  			function generateId() {
  
  				return 'three_default_' + count ++;
  
  			}
  
  			function isEmpty( object ) {
  
  				return Object.keys( object ).length === 0;
  
  			} // asset
  
  
  			function parseAsset( xml ) {
  
  				return {
  					unit: parseAssetUnit( getElementsByTagName( xml, 'unit' )[ 0 ] ),
  					upAxis: parseAssetUpAxis( getElementsByTagName( xml, 'up_axis' )[ 0 ] )
  				};
  
  			}
  
  			function parseAssetUnit( xml ) {
  
  				if ( xml !== undefined && xml.hasAttribute( 'meter' ) === true ) {
  
  					return parseFloat( xml.getAttribute( 'meter' ) );
  
  				} else {
  
  					return 1; // default 1 meter
  
  				}
  
  			}
  
  			function parseAssetUpAxis( xml ) {
  
  				return xml !== undefined ? xml.textContent : 'Y_UP';
  
  			} // library
  
  
  			function parseLibrary( xml, libraryName, nodeName, parser ) {
  
  				const library = getElementsByTagName( xml, libraryName )[ 0 ];
  
  				if ( library !== undefined ) {
  
  					const elements = getElementsByTagName( library, nodeName );
  
  					for ( let i = 0; i < elements.length; i ++ ) {
  
  						parser( elements[ i ] );
  
  					}
  
  				}
  
  			}
  
  			function buildLibrary( data, builder ) {
  
  				for ( const name in data ) {
  
  					const object = data[ name ];
  					object.build = builder( data[ name ] );
  
  				}
  
  			} // get
  
  
  			function getBuild( data, builder ) {
  
  				if ( data.build !== undefined ) return data.build;
  				data.build = builder( data );
  				return data.build;
  
  			} // animation
  
  
  			function parseAnimation( xml ) {
  
  				const data = {
  					sources: {},
  					samplers: {},
  					channels: {}
  				};
  				let hasChildren = false;
  
  				for ( let i = 0, l = xml.childNodes.length; i < l; i ++ ) {
  
  					const child = xml.childNodes[ i ];
  					if ( child.nodeType !== 1 ) continue;
  					let id;
  
  					switch ( child.nodeName ) {
  
  						case 'source':
  							id = child.getAttribute( 'id' );
  							data.sources[ id ] = parseSource( child );
  							break;
  
  						case 'sampler':
  							id = child.getAttribute( 'id' );
  							data.samplers[ id ] = parseAnimationSampler( child );
  							break;
  
  						case 'channel':
  							id = child.getAttribute( 'target' );
  							data.channels[ id ] = parseAnimationChannel( child );
  							break;
  
  						case 'animation':
  							// hierarchy of related animations
  							parseAnimation( child );
  							hasChildren = true;
  							break;
  
  						default:
  							console.log( child );
  
  					}
  
  				}
  
  				if ( hasChildren === false ) {
  
  					// since 'id' attributes can be optional, it's necessary to generate a UUID for unqiue assignment
  					library.animations[ xml.getAttribute( 'id' ) || THREE.MathUtils.generateUUID() ] = data;
  
  				}
  
  			}
  
  			function parseAnimationSampler( xml ) {
  
  				const data = {
  					inputs: {}
  				};
  
  				for ( let i = 0, l = xml.childNodes.length; i < l; i ++ ) {
  
  					const child = xml.childNodes[ i ];
  					if ( child.nodeType !== 1 ) continue;
  
  					switch ( child.nodeName ) {
  
  						case 'input':
  							const id = parseId( child.getAttribute( 'source' ) );
  							const semantic = child.getAttribute( 'semantic' );
  							data.inputs[ semantic ] = id;
  							break;
  
  					}
  
  				}
  
  				return data;
  
  			}
  
  			function parseAnimationChannel( xml ) {
  
  				const data = {};
  				const target = xml.getAttribute( 'target' ); // parsing SID Addressing Syntax
  
  				let parts = target.split( '/' );
  				const id = parts.shift();
  				let sid = parts.shift(); // check selection syntax
  
  				const arraySyntax = sid.indexOf( '(' ) !== - 1;
  				const memberSyntax = sid.indexOf( '.' ) !== - 1;
  
  				if ( memberSyntax ) {
  
  					//  member selection access
  					parts = sid.split( '.' );
  					sid = parts.shift();
  					data.member = parts.shift();
  
  				} else if ( arraySyntax ) {
  
  					// array-access syntax. can be used to express fields in one-dimensional vectors or two-dimensional matrices.
  					const indices = sid.split( '(' );
  					sid = indices.shift();
  
  					for ( let i = 0; i < indices.length; i ++ ) {
  
  						indices[ i ] = parseInt( indices[ i ].replace( /\)/, '' ) );
  
  					}
  
  					data.indices = indices;
  
  				}
  
  				data.id = id;
  				data.sid = sid;
  				data.arraySyntax = arraySyntax;
  				data.memberSyntax = memberSyntax;
  				data.sampler = parseId( xml.getAttribute( 'source' ) );
  				return data;
  
  			}
  
  			function buildAnimation( data ) {
  
  				const tracks = [];
  				const channels = data.channels;
  				const samplers = data.samplers;
  				const sources = data.sources;
  
  				for ( const target in channels ) {
  
  					if ( channels.hasOwnProperty( target ) ) {
  
  						const channel = channels[ target ];
  						const sampler = samplers[ channel.sampler ];
  						const inputId = sampler.inputs.INPUT;
  						const outputId = sampler.inputs.OUTPUT;
  						const inputSource = sources[ inputId ];
  						const outputSource = sources[ outputId ];
  						const animation = buildAnimationChannel( channel, inputSource, outputSource );
  						createKeyframeTracks( animation, tracks );
  
  					}
  
  				}
  
  				return tracks;
  
  			}
  
  			function getAnimation( id ) {
  
  				return getBuild( library.animations[ id ], buildAnimation );
  
  			}
  
  			function buildAnimationChannel( channel, inputSource, outputSource ) {
  
  				const node = library.nodes[ channel.id ];
  				const object3D = getNode( node.id );
  				const transform = node.transforms[ channel.sid ];
  				const defaultMatrix = node.matrix.clone().transpose();
  				let time, stride;
  				let i, il, j, jl;
  				const data = {}; // the collada spec allows the animation of data in various ways.
  				// depending on the transform type (matrix, translate, rotate, scale), we execute different logic
  
  				switch ( transform ) {
  
  					case 'matrix':
  						for ( i = 0, il = inputSource.array.length; i < il; i ++ ) {
  
  							time = inputSource.array[ i ];
  							stride = i * outputSource.stride;
  							if ( data[ time ] === undefined ) data[ time ] = {};
  
  							if ( channel.arraySyntax === true ) {
  
  								const value = outputSource.array[ stride ];
  								const index = channel.indices[ 0 ] + 4 * channel.indices[ 1 ];
  								data[ time ][ index ] = value;
  
  							} else {
  
  								for ( j = 0, jl = outputSource.stride; j < jl; j ++ ) {
  
  									data[ time ][ j ] = outputSource.array[ stride + j ];
  
  								}
  
  							}
  
  						}
  
  						break;
  
  					case 'translate':
  						console.warn( 'THREE.ColladaLoader: Animation transform type "%s" not yet implemented.', transform );
  						break;
  
  					case 'rotate':
  						console.warn( 'THREE.ColladaLoader: Animation transform type "%s" not yet implemented.', transform );
  						break;
  
  					case 'scale':
  						console.warn( 'THREE.ColladaLoader: Animation transform type "%s" not yet implemented.', transform );
  						break;
  
  				}
  
  				const keyframes = prepareAnimationData( data, defaultMatrix );
  				const animation = {
  					name: object3D.uuid,
  					keyframes: keyframes
  				};
  				return animation;
  
  			}
  
  			function prepareAnimationData( data, defaultMatrix ) {
  
  				const keyframes = []; // transfer data into a sortable array
  
  				for ( const time in data ) {
  
  					keyframes.push( {
  						time: parseFloat( time ),
  						value: data[ time ]
  					} );
  
  				} // ensure keyframes are sorted by time
  
  
  				keyframes.sort( ascending ); // now we clean up all animation data, so we can use them for keyframe tracks
  
  				for ( let i = 0; i < 16; i ++ ) {
  
  					transformAnimationData( keyframes, i, defaultMatrix.elements[ i ] );
  
  				}
  
  				return keyframes; // array sort function
  
  				function ascending( a, b ) {
  
  					return a.time - b.time;
  
  				}
  
  			}
  
  			const position = new THREE.Vector3();
  			const scale = new THREE.Vector3();
  			const quaternion = new THREE.Quaternion();
  
  			function createKeyframeTracks( animation, tracks ) {
  
  				const keyframes = animation.keyframes;
  				const name = animation.name;
  				const times = [];
  				const positionData = [];
  				const quaternionData = [];
  				const scaleData = [];
  
  				for ( let i = 0, l = keyframes.length; i < l; i ++ ) {
  
  					const keyframe = keyframes[ i ];
  					const time = keyframe.time;
  					const value = keyframe.value;
  					matrix.fromArray( value ).transpose();
  					matrix.decompose( position, quaternion, scale );
  					times.push( time );
  					positionData.push( position.x, position.y, position.z );
  					quaternionData.push( quaternion.x, quaternion.y, quaternion.z, quaternion.w );
  					scaleData.push( scale.x, scale.y, scale.z );
  
  				}
  
  				if ( positionData.length > 0 ) tracks.push( new THREE.VectorKeyframeTrack( name + '.position', times, positionData ) );
  				if ( quaternionData.length > 0 ) tracks.push( new THREE.QuaternionKeyframeTrack( name + '.quaternion', times, quaternionData ) );
  				if ( scaleData.length > 0 ) tracks.push( new THREE.VectorKeyframeTrack( name + '.scale', times, scaleData ) );
  				return tracks;
  
  			}
  
  			function transformAnimationData( keyframes, property, defaultValue ) {
  
  				let keyframe;
  				let empty = true;
  				let i, l; // check, if values of a property are missing in our keyframes
  
  				for ( i = 0, l = keyframes.length; i < l; i ++ ) {
  
  					keyframe = keyframes[ i ];
  
  					if ( keyframe.value[ property ] === undefined ) {
  
  						keyframe.value[ property ] = null; // mark as missing
  
  					} else {
  
  						empty = false;
  
  					}
  
  				}
  
  				if ( empty === true ) {
  
  					// no values at all, so we set a default value
  					for ( i = 0, l = keyframes.length; i < l; i ++ ) {
  
  						keyframe = keyframes[ i ];
  						keyframe.value[ property ] = defaultValue;
  
  					}
  
  				} else {
  
  					// filling gaps
  					createMissingKeyframes( keyframes, property );
  
  				}
  
  			}
  
  			function createMissingKeyframes( keyframes, property ) {
  
  				let prev, next;
  
  				for ( let i = 0, l = keyframes.length; i < l; i ++ ) {
  
  					const keyframe = keyframes[ i ];
  
  					if ( keyframe.value[ property ] === null ) {
  
  						prev = getPrev( keyframes, i, property );
  						next = getNext( keyframes, i, property );
  
  						if ( prev === null ) {
  
  							keyframe.value[ property ] = next.value[ property ];
  							continue;
  
  						}
  
  						if ( next === null ) {
  
  							keyframe.value[ property ] = prev.value[ property ];
  							continue;
  
  						}
  
  						interpolate( keyframe, prev, next, property );
  
  					}
  
  				}
  
  			}
  
  			function getPrev( keyframes, i, property ) {
  
  				while ( i >= 0 ) {
  
  					const keyframe = keyframes[ i ];
  					if ( keyframe.value[ property ] !== null ) return keyframe;
  					i --;
  
  				}
  
  				return null;
  
  			}
  
  			function getNext( keyframes, i, property ) {
  
  				while ( i < keyframes.length ) {
  
  					const keyframe = keyframes[ i ];
  					if ( keyframe.value[ property ] !== null ) return keyframe;
  					i ++;
  
  				}
  
  				return null;
  
  			}
  
  			function interpolate( key, prev, next, property ) {
  
  				if ( next.time - prev.time === 0 ) {
  
  					key.value[ property ] = prev.value[ property ];
  					return;
  
  				}
  
  				key.value[ property ] = ( key.time - prev.time ) * ( next.value[ property ] - prev.value[ property ] ) / ( next.time - prev.time ) + prev.value[ property ];
  
  			} // animation clips
  
  
  			function parseAnimationClip( xml ) {
  
  				const data = {
  					name: xml.getAttribute( 'id' ) || 'default',
  					start: parseFloat( xml.getAttribute( 'start' ) || 0 ),
  					end: parseFloat( xml.getAttribute( 'end' ) || 0 ),
  					animations: []
  				};
  
  				for ( let i = 0, l = xml.childNodes.length; i < l; i ++ ) {
  
  					const child = xml.childNodes[ i ];
  					if ( child.nodeType !== 1 ) continue;
  
  					switch ( child.nodeName ) {
  
  						case 'instance_animation':
  							data.animations.push( parseId( child.getAttribute( 'url' ) ) );
  							break;
  
  					}
  
  				}
  
  				library.clips[ xml.getAttribute( 'id' ) ] = data;
  
  			}
  
  			function buildAnimationClip( data ) {
  
  				const tracks = [];
  				const name = data.name;
  				const duration = data.end - data.start || - 1;
  				const animations = data.animations;
  
  				for ( let i = 0, il = animations.length; i < il; i ++ ) {
  
  					const animationTracks = getAnimation( animations[ i ] );
  
  					for ( let j = 0, jl = animationTracks.length; j < jl; j ++ ) {
  
  						tracks.push( animationTracks[ j ] );
  
  					}
  
  				}
  
  				return new THREE.AnimationClip( name, duration, tracks );
  
  			}
  
  			function getAnimationClip( id ) {
  
  				return getBuild( library.clips[ id ], buildAnimationClip );
  
  			} // controller
  
  
  			function parseController( xml ) {
  
  				const data = {};
  
  				for ( let i = 0, l = xml.childNodes.length; i < l; i ++ ) {
  
  					const child = xml.childNodes[ i ];
  					if ( child.nodeType !== 1 ) continue;
  
  					switch ( child.nodeName ) {
  
  						case 'skin':
  							// there is exactly one skin per controller
  							data.id = parseId( child.getAttribute( 'source' ) );
  							data.skin = parseSkin( child );
  							break;
  
  						case 'morph':
  							data.id = parseId( child.getAttribute( 'source' ) );
  							console.warn( 'THREE.ColladaLoader: Morph target animation not supported yet.' );
  							break;
  
  					}
  
  				}
  
  				library.controllers[ xml.getAttribute( 'id' ) ] = data;
  
  			}
  
  			function parseSkin( xml ) {
  
  				const data = {
  					sources: {}
  				};
  
  				for ( let i = 0, l = xml.childNodes.length; i < l; i ++ ) {
  
  					const child = xml.childNodes[ i ];
  					if ( child.nodeType !== 1 ) continue;
  
  					switch ( child.nodeName ) {
  
  						case 'bind_shape_matrix':
  							data.bindShapeMatrix = parseFloats( child.textContent );
  							break;
  
  						case 'source':
  							const id = child.getAttribute( 'id' );
  							data.sources[ id ] = parseSource( child );
  							break;
  
  						case 'joints':
  							data.joints = parseJoints( child );
  							break;
  
  						case 'vertex_weights':
  							data.vertexWeights = parseVertexWeights( child );
  							break;
  
  					}
  
  				}
  
  				return data;
  
  			}
  
  			function parseJoints( xml ) {
  
  				const data = {
  					inputs: {}
  				};
  
  				for ( let i = 0, l = xml.childNodes.length; i < l; i ++ ) {
  
  					const child = xml.childNodes[ i ];
  					if ( child.nodeType !== 1 ) continue;
  
  					switch ( child.nodeName ) {
  
  						case 'input':
  							const semantic = child.getAttribute( 'semantic' );
  							const id = parseId( child.getAttribute( 'source' ) );
  							data.inputs[ semantic ] = id;
  							break;
  
  					}
  
  				}
  
  				return data;
  
  			}
  
  			function parseVertexWeights( xml ) {
  
  				const data = {
  					inputs: {}
  				};
  
  				for ( let i = 0, l = xml.childNodes.length; i < l; i ++ ) {
  
  					const child = xml.childNodes[ i ];
  					if ( child.nodeType !== 1 ) continue;
  
  					switch ( child.nodeName ) {
  
  						case 'input':
  							const semantic = child.getAttribute( 'semantic' );
  							const id = parseId( child.getAttribute( 'source' ) );
  							const offset = parseInt( child.getAttribute( 'offset' ) );
  							data.inputs[ semantic ] = {
  								id: id,
  								offset: offset
  							};
  							break;
  
  						case 'vcount':
  							data.vcount = parseInts( child.textContent );
  							break;
  
  						case 'v':
  							data.v = parseInts( child.textContent );
  							break;
  
  					}
  
  				}
  
  				return data;
  
  			}
  
  			function buildController( data ) {
  
  				const build = {
  					id: data.id
  				};
  				const geometry = library.geometries[ build.id ];
  
  				if ( data.skin !== undefined ) {
  
  					build.skin = buildSkin( data.skin ); // we enhance the 'sources' property of the corresponding geometry with our skin data
  
  					geometry.sources.skinIndices = build.skin.indices;
  					geometry.sources.skinWeights = build.skin.weights;
  
  				}
  
  				return build;
  
  			}
  
  			function buildSkin( data ) {
  
  				const BONE_LIMIT = 4;
  				const build = {
  					joints: [],
  					// this must be an array to preserve the joint order
  					indices: {
  						array: [],
  						stride: BONE_LIMIT
  					},
  					weights: {
  						array: [],
  						stride: BONE_LIMIT
  					}
  				};
  				const sources = data.sources;
  				const vertexWeights = data.vertexWeights;
  				const vcount = vertexWeights.vcount;
  				const v = vertexWeights.v;
  				const jointOffset = vertexWeights.inputs.JOINT.offset;
  				const weightOffset = vertexWeights.inputs.WEIGHT.offset;
  				const jointSource = data.sources[ data.joints.inputs.JOINT ];
  				const inverseSource = data.sources[ data.joints.inputs.INV_BIND_MATRIX ];
  				const weights = sources[ vertexWeights.inputs.WEIGHT.id ].array;
  				let stride = 0;
  				let i, j, l; // procces skin data for each vertex
  
  				for ( i = 0, l = vcount.length; i < l; i ++ ) {
  
  					const jointCount = vcount[ i ]; // this is the amount of joints that affect a single vertex
  
  					const vertexSkinData = [];
  
  					for ( j = 0; j < jointCount; j ++ ) {
  
  						const skinIndex = v[ stride + jointOffset ];
  						const weightId = v[ stride + weightOffset ];
  						const skinWeight = weights[ weightId ];
  						vertexSkinData.push( {
  							index: skinIndex,
  							weight: skinWeight
  						} );
  						stride += 2;
  
  					} // we sort the joints in descending order based on the weights.
  					// this ensures, we only procced the most important joints of the vertex
  
  
  					vertexSkinData.sort( descending ); // now we provide for each vertex a set of four index and weight values.
  					// the order of the skin data matches the order of vertices
  
  					for ( j = 0; j < BONE_LIMIT; j ++ ) {
  
  						const d = vertexSkinData[ j ];
  
  						if ( d !== undefined ) {
  
  							build.indices.array.push( d.index );
  							build.weights.array.push( d.weight );
  
  						} else {
  
  							build.indices.array.push( 0 );
  							build.weights.array.push( 0 );
  
  						}
  
  					}
  
  				} // setup bind matrix
  
  
  				if ( data.bindShapeMatrix ) {
  
  					build.bindMatrix = new THREE.Matrix4().fromArray( data.bindShapeMatrix ).transpose();
  
  				} else {
  
  					build.bindMatrix = new THREE.Matrix4().identity();
  
  				} // process bones and inverse bind matrix data
  
  
  				for ( i = 0, l = jointSource.array.length; i < l; i ++ ) {
  
  					const name = jointSource.array[ i ];
  					const boneInverse = new THREE.Matrix4().fromArray( inverseSource.array, i * inverseSource.stride ).transpose();
  					build.joints.push( {
  						name: name,
  						boneInverse: boneInverse
  					} );
  
  				}
  
  				return build; // array sort function
  
  				function descending( a, b ) {
  
  					return b.weight - a.weight;
  
  				}
  
  			}
  
  			function getController( id ) {
  
  				return getBuild( library.controllers[ id ], buildController );
  
  			} // image
  
  
  			function parseImage( xml ) {
  
  				const data = {
  					init_from: getElementsByTagName( xml, 'init_from' )[ 0 ].textContent
  				};
  				library.images[ xml.getAttribute( 'id' ) ] = data;
  
  			}
  
  			function buildImage( data ) {
  
  				if ( data.build !== undefined ) return data.build;
  				return data.init_from;
  
  			}
  
  			function getImage( id ) {
  
  				const data = library.images[ id ];
  
  				if ( data !== undefined ) {
  
  					return getBuild( data, buildImage );
  
  				}
  
  				console.warn( 'THREE.ColladaLoader: Couldn\'t find image with ID:', id );
  				return null;
  
  			} // effect
  
  
  			function parseEffect( xml ) {
  
  				const data = {};
  
  				for ( let i = 0, l = xml.childNodes.length; i < l; i ++ ) {
  
  					const child = xml.childNodes[ i ];
  					if ( child.nodeType !== 1 ) continue;
  
  					switch ( child.nodeName ) {
  
  						case 'profile_COMMON':
  							data.profile = parseEffectProfileCOMMON( child );
  							break;
  
  					}
  
  				}
  
  				library.effects[ xml.getAttribute( 'id' ) ] = data;
  
  			}
  
  			function parseEffectProfileCOMMON( xml ) {
  
  				const data = {
  					surfaces: {},
  					samplers: {}
  				};
  
  				for ( let i = 0, l = xml.childNodes.length; i < l; i ++ ) {
  
  					const child = xml.childNodes[ i ];
  					if ( child.nodeType !== 1 ) continue;
  
  					switch ( child.nodeName ) {
  
  						case 'newparam':
  							parseEffectNewparam( child, data );
  							break;
  
  						case 'technique':
  							data.technique = parseEffectTechnique( child );
  							break;
  
  						case 'extra':
  							data.extra = parseEffectExtra( child );
  							break;
  
  					}
  
  				}
  
  				return data;
  
  			}
  
  			function parseEffectNewparam( xml, data ) {
  
  				const sid = xml.getAttribute( 'sid' );
  
  				for ( let i = 0, l = xml.childNodes.length; i < l; i ++ ) {
  
  					const child = xml.childNodes[ i ];
  					if ( child.nodeType !== 1 ) continue;
  
  					switch ( child.nodeName ) {
  
  						case 'surface':
  							data.surfaces[ sid ] = parseEffectSurface( child );
  							break;
  
  						case 'sampler2D':
  							data.samplers[ sid ] = parseEffectSampler( child );
  							break;
  
  					}
  
  				}
  
  			}
  
  			function parseEffectSurface( xml ) {
  
  				const data = {};
  
  				for ( let i = 0, l = xml.childNodes.length; i < l; i ++ ) {
  
  					const child = xml.childNodes[ i ];
  					if ( child.nodeType !== 1 ) continue;
  
  					switch ( child.nodeName ) {
  
  						case 'init_from':
  							data.init_from = child.textContent;
  							break;
  
  					}
  
  				}
  
  				return data;
  
  			}
  
  			function parseEffectSampler( xml ) {
  
  				const data = {};
  
  				for ( let i = 0, l = xml.childNodes.length; i < l; i ++ ) {
  
  					const child = xml.childNodes[ i ];
  					if ( child.nodeType !== 1 ) continue;
  
  					switch ( child.nodeName ) {
  
  						case 'source':
  							data.source = child.textContent;
  							break;
  
  					}
  
  				}
  
  				return data;
  
  			}
  
  			function parseEffectTechnique( xml ) {
  
  				const data = {};
  
  				for ( let i = 0, l = xml.childNodes.length; i < l; i ++ ) {
  
  					const child = xml.childNodes[ i ];
  					if ( child.nodeType !== 1 ) continue;
  
  					switch ( child.nodeName ) {
  
  						case 'constant':
  						case 'lambert':
  						case 'blinn':
  						case 'phong':
  							data.type = child.nodeName;
  							data.parameters = parseEffectParameters( child );
  							break;
  
  						case 'extra':
  							data.extra = parseEffectExtra( child );
  							break;
  
  					}
  
  				}
  
  				return data;
  
  			}
  
  			function parseEffectParameters( xml ) {
  
  				const data = {};
  
  				for ( let i = 0, l = xml.childNodes.length; i < l; i ++ ) {
  
  					const child = xml.childNodes[ i ];
  					if ( child.nodeType !== 1 ) continue;
  
  					switch ( child.nodeName ) {
  
  						case 'emission':
  						case 'diffuse':
  						case 'specular':
  						case 'bump':
  						case 'ambient':
  						case 'shininess':
  						case 'transparency':
  							data[ child.nodeName ] = parseEffectParameter( child );
  							break;
  
  						case 'transparent':
  							data[ child.nodeName ] = {
  								opaque: child.hasAttribute( 'opaque' ) ? child.getAttribute( 'opaque' ) : 'A_ONE',
  								data: parseEffectParameter( child )
  							};
  							break;
  
  					}
  
  				}
  
  				return data;
  
  			}
  
  			function parseEffectParameter( xml ) {
  
  				const data = {};
  
  				for ( let i = 0, l = xml.childNodes.length; i < l; i ++ ) {
  
  					const child = xml.childNodes[ i ];
  					if ( child.nodeType !== 1 ) continue;
  
  					switch ( child.nodeName ) {
  
  						case 'color':
  							data[ child.nodeName ] = parseFloats( child.textContent );
  							break;
  
  						case 'float':
  							data[ child.nodeName ] = parseFloat( child.textContent );
  							break;
  
  						case 'texture':
  							data[ child.nodeName ] = {
  								id: child.getAttribute( 'texture' ),
  								extra: parseEffectParameterTexture( child )
  							};
  							break;
  
  					}
  
  				}
  
  				return data;
  
  			}
  
  			function parseEffectParameterTexture( xml ) {
  
  				const data = {
  					technique: {}
  				};
  
  				for ( let i = 0, l = xml.childNodes.length; i < l; i ++ ) {
  
  					const child = xml.childNodes[ i ];
  					if ( child.nodeType !== 1 ) continue;
  
  					switch ( child.nodeName ) {
  
  						case 'extra':
  							parseEffectParameterTextureExtra( child, data );
  							break;
  
  					}
  
  				}
  
  				return data;
  
  			}
  
  			function parseEffectParameterTextureExtra( xml, data ) {
  
  				for ( let i = 0, l = xml.childNodes.length; i < l; i ++ ) {
  
  					const child = xml.childNodes[ i ];
  					if ( child.nodeType !== 1 ) continue;
  
  					switch ( child.nodeName ) {
  
  						case 'technique':
  							parseEffectParameterTextureExtraTechnique( child, data );
  							break;
  
  					}
  
  				}
  
  			}
  
  			function parseEffectParameterTextureExtraTechnique( xml, data ) {
  
  				for ( let i = 0, l = xml.childNodes.length; i < l; i ++ ) {
  
  					const child = xml.childNodes[ i ];
  					if ( child.nodeType !== 1 ) continue;
  
  					switch ( child.nodeName ) {
  
  						case 'repeatU':
  						case 'repeatV':
  						case 'offsetU':
  						case 'offsetV':
  							data.technique[ child.nodeName ] = parseFloat( child.textContent );
  							break;
  
  						case 'wrapU':
  						case 'wrapV':
  							// some files have values for wrapU/wrapV which become NaN via parseInt
  							if ( child.textContent.toUpperCase() === 'TRUE' ) {
  
  								data.technique[ child.nodeName ] = 1;
  
  							} else if ( child.textContent.toUpperCase() === 'FALSE' ) {
  
  								data.technique[ child.nodeName ] = 0;
  
  							} else {
  
  								data.technique[ child.nodeName ] = parseInt( child.textContent );
  
  							}
  
  							break;
  
  						case 'bump':
  							data[ child.nodeName ] = parseEffectExtraTechniqueBump( child );
  							break;
  
  					}
  
  				}
  
  			}
  
  			function parseEffectExtra( xml ) {
  
  				const data = {};
  
  				for ( let i = 0, l = xml.childNodes.length; i < l; i ++ ) {
  
  					const child = xml.childNodes[ i ];
  					if ( child.nodeType !== 1 ) continue;
  
  					switch ( child.nodeName ) {
  
  						case 'technique':
  							data.technique = parseEffectExtraTechnique( child );
  							break;
  
  					}
  
  				}
  
  				return data;
  
  			}
  
  			function parseEffectExtraTechnique( xml ) {
  
  				const data = {};
  
  				for ( let i = 0, l = xml.childNodes.length; i < l; i ++ ) {
  
  					const child = xml.childNodes[ i ];
  					if ( child.nodeType !== 1 ) continue;
  
  					switch ( child.nodeName ) {
  
  						case 'double_sided':
  							data[ child.nodeName ] = parseInt( child.textContent );
  							break;
  
  						case 'bump':
  							data[ child.nodeName ] = parseEffectExtraTechniqueBump( child );
  							break;
  
  					}
  
  				}
  
  				return data;
  
  			}
  
  			function parseEffectExtraTechniqueBump( xml ) {
  
  				var data = {};
  
  				for ( var i = 0, l = xml.childNodes.length; i < l; i ++ ) {
  
  					var child = xml.childNodes[ i ];
  					if ( child.nodeType !== 1 ) continue;
  
  					switch ( child.nodeName ) {
  
  						case 'texture':
  							data[ child.nodeName ] = {
  								id: child.getAttribute( 'texture' ),
  								texcoord: child.getAttribute( 'texcoord' ),
  								extra: parseEffectParameterTexture( child )
  							};
  							break;
  
  					}
  
  				}
  
  				return data;
  
  			}
  
  			function buildEffect( data ) {
  
  				return data;
  
  			}
  
  			function getEffect( id ) {
  
  				return getBuild( library.effects[ id ], buildEffect );
  
  			} // material
  
  
  			function parseMaterial( xml ) {
  
  				const data = {
  					name: xml.getAttribute( 'name' )
  				};
  
  				for ( let i = 0, l = xml.childNodes.length; i < l; i ++ ) {
  
  					const child = xml.childNodes[ i ];
  					if ( child.nodeType !== 1 ) continue;
  
  					switch ( child.nodeName ) {
  
  						case 'instance_effect':
  							data.url = parseId( child.getAttribute( 'url' ) );
  							break;
  
  					}
  
  				}
  
  				library.materials[ xml.getAttribute( 'id' ) ] = data;
  
  			}
  
  			function getTextureLoader( image ) {
  
  				let loader;
  				let extension = image.slice( ( image.lastIndexOf( '.' ) - 1 >>> 0 ) + 2 ); // http://www.jstips.co/en/javascript/get-file-extension/
  
  				extension = extension.toLowerCase();
  
  				switch ( extension ) {
  
  					case 'tga':
  						loader = tgaLoader;
  						break;
  
  					default:
  						loader = textureLoader;
  
  				}
  
  				return loader;
  
  			}
  
  			function buildMaterial( data ) {
  
  				const effect = getEffect( data.url );
  				const technique = effect.profile.technique;
  				let material;
  
  				switch ( technique.type ) {
  
  					case 'phong':
  					case 'blinn':
  						material = new THREE.MeshPhongMaterial();
  						break;
  
  					case 'lambert':
  						material = new THREE.MeshLambertMaterial();
  						break;
  
  					default:
  						material = new THREE.MeshBasicMaterial();
  						break;
  
  				}
  
  				material.name = data.name || '';
  
  				function getTexture( textureObject ) {
  
  					const sampler = effect.profile.samplers[ textureObject.id ];
  					let image = null; // get image
  
  					if ( sampler !== undefined ) {
  
  						const surface = effect.profile.surfaces[ sampler.source ];
  						image = getImage( surface.init_from );
  
  					} else {
  
  						console.warn( 'THREE.ColladaLoader: Undefined sampler. Access image directly (see #12530).' );
  						image = getImage( textureObject.id );
  
  					} // create texture if image is avaiable
  
  
  					if ( image !== null ) {
  
  						const loader = getTextureLoader( image );
  
  						if ( loader !== undefined ) {
  
  							const texture = loader.load( image );
  							const extra = textureObject.extra;
  
  							if ( extra !== undefined && extra.technique !== undefined && isEmpty( extra.technique ) === false ) {
  
  								const technique = extra.technique;
  								texture.wrapS = technique.wrapU ? THREE.RepeatWrapping : THREE.ClampToEdgeWrapping;
  								texture.wrapT = technique.wrapV ? THREE.RepeatWrapping : THREE.ClampToEdgeWrapping;
  								texture.offset.set( technique.offsetU || 0, technique.offsetV || 0 );
  								texture.repeat.set( technique.repeatU || 1, technique.repeatV || 1 );
  
  							} else {
  
  								texture.wrapS = THREE.RepeatWrapping;
  								texture.wrapT = THREE.RepeatWrapping;
  
  							}
  
  							return texture;
  
  						} else {
  
  							console.warn( 'THREE.ColladaLoader: THREE.Loader for texture %s not found.', image );
  							return null;
  
  						}
  
  					} else {
  
  						console.warn( 'THREE.ColladaLoader: Couldn\'t create texture with ID:', textureObject.id );
  						return null;
  
  					}
  
  				}
  
  				const parameters = technique.parameters;
  
  				for ( const key in parameters ) {
  
  					const parameter = parameters[ key ];
  
  					switch ( key ) {
  
  						case 'diffuse':
  							if ( parameter.color ) material.color.fromArray( parameter.color );
  							if ( parameter.texture ) material.map = getTexture( parameter.texture );
  							break;
  
  						case 'specular':
  							if ( parameter.color && material.specular ) material.specular.fromArray( parameter.color );
  							if ( parameter.texture ) material.specularMap = getTexture( parameter.texture );
  							break;
  
  						case 'bump':
  							if ( parameter.texture ) material.normalMap = getTexture( parameter.texture );
  							break;
  
  						case 'ambient':
  							if ( parameter.texture ) material.lightMap = getTexture( parameter.texture );
  							break;
  
  						case 'shininess':
  							if ( parameter.float && material.shininess ) material.shininess = parameter.float;
  							break;
  
  						case 'emission':
  							if ( parameter.color && material.emissive ) material.emissive.fromArray( parameter.color );
  							if ( parameter.texture ) material.emissiveMap = getTexture( parameter.texture );
  							break;
  
  					}
  
  				} //
  
  
  				let transparent = parameters[ 'transparent' ];
  				let transparency = parameters[ 'transparency' ]; // <transparency> does not exist but <transparent>
  
  				if ( transparency === undefined && transparent ) {
  
  					transparency = {
  						float: 1
  					};
  
  				} // <transparent> does not exist but <transparency>
  
  
  				if ( transparent === undefined && transparency ) {
  
  					transparent = {
  						opaque: 'A_ONE',
  						data: {
  							color: [ 1, 1, 1, 1 ]
  						}
  					};
  
  				}
  
  				if ( transparent && transparency ) {
  
  					// handle case if a texture exists but no color
  					if ( transparent.data.texture ) {
  
  						// we do not set an alpha map (see #13792)
  						material.transparent = true;
  
  					} else {
  
  						const color = transparent.data.color;
  
  						switch ( transparent.opaque ) {
  
  							case 'A_ONE':
  								material.opacity = color[ 3 ] * transparency.float;
  								break;
  
  							case 'RGB_ZERO':
  								material.opacity = 1 - color[ 0 ] * transparency.float;
  								break;
  
  							case 'A_ZERO':
  								material.opacity = 1 - color[ 3 ] * transparency.float;
  								break;
  
  							case 'RGB_ONE':
  								material.opacity = color[ 0 ] * transparency.float;
  								break;
  
  							default:
  								console.warn( 'THREE.ColladaLoader: Invalid opaque type "%s" of transparent tag.', transparent.opaque );
  
  						}
  
  						if ( material.opacity < 1 ) material.transparent = true;
  
  					}
  
  				} //
  
  
  				if ( technique.extra !== undefined && technique.extra.technique !== undefined ) {
  
  					const techniques = technique.extra.technique;
  
  					for ( const k in techniques ) {
  
  						const v = techniques[ k ];
  
  						switch ( k ) {
  
  							case 'double_sided':
  								material.side = v === 1 ? THREE.DoubleSide : THREE.FrontSide;
  								break;
  
  							case 'bump':
  								material.normalMap = getTexture( v.texture );
  								material.normalScale = new THREE.Vector2( 1, 1 );
  								break;
  
  						}
  
  					}
  
  				}
  
  				return material;
  
  			}
  
  			function getMaterial( id ) {
  
  				return getBuild( library.materials[ id ], buildMaterial );
  
  			} // camera
  
  
  			function parseCamera( xml ) {
  
  				const data = {
  					name: xml.getAttribute( 'name' )
  				};
  
  				for ( let i = 0, l = xml.childNodes.length; i < l; i ++ ) {
  
  					const child = xml.childNodes[ i ];
  					if ( child.nodeType !== 1 ) continue;
  
  					switch ( child.nodeName ) {
  
  						case 'optics':
  							data.optics = parseCameraOptics( child );
  							break;
  
  					}
  
  				}
  
  				library.cameras[ xml.getAttribute( 'id' ) ] = data;
  
  			}
  
  			function parseCameraOptics( xml ) {
  
  				for ( let i = 0; i < xml.childNodes.length; i ++ ) {
  
  					const child = xml.childNodes[ i ];
  
  					switch ( child.nodeName ) {
  
  						case 'technique_common':
  							return parseCameraTechnique( child );
  
  					}
  
  				}
  
  				return {};
  
  			}
  
  			function parseCameraTechnique( xml ) {
  
  				const data = {};
  
  				for ( let i = 0; i < xml.childNodes.length; i ++ ) {
  
  					const child = xml.childNodes[ i ];
  
  					switch ( child.nodeName ) {
  
  						case 'perspective':
  						case 'orthographic':
  							data.technique = child.nodeName;
  							data.parameters = parseCameraParameters( child );
  							break;
  
  					}
  
  				}
  
  				return data;
  
  			}
  
  			function parseCameraParameters( xml ) {
  
  				const data = {};
  
  				for ( let i = 0; i < xml.childNodes.length; i ++ ) {
  
  					const child = xml.childNodes[ i ];
  
  					switch ( child.nodeName ) {
  
  						case 'xfov':
  						case 'yfov':
  						case 'xmag':
  						case 'ymag':
  						case 'znear':
  						case 'zfar':
  						case 'aspect_ratio':
  							data[ child.nodeName ] = parseFloat( child.textContent );
  							break;
  
  					}
  
  				}
  
  				return data;
  
  			}
  
  			function buildCamera( data ) {
  
  				let camera;
  
  				switch ( data.optics.technique ) {
  
  					case 'perspective':
  						camera = new THREE.PerspectiveCamera( data.optics.parameters.yfov, data.optics.parameters.aspect_ratio, data.optics.parameters.znear, data.optics.parameters.zfar );
  						break;
  
  					case 'orthographic':
  						let ymag = data.optics.parameters.ymag;
  						let xmag = data.optics.parameters.xmag;
  						const aspectRatio = data.optics.parameters.aspect_ratio;
  						xmag = xmag === undefined ? ymag * aspectRatio : xmag;
  						ymag = ymag === undefined ? xmag / aspectRatio : ymag;
  						xmag *= 0.5;
  						ymag *= 0.5;
  						camera = new THREE.OrthographicCamera( - xmag, xmag, ymag, - ymag, // left, right, top, bottom
  							data.optics.parameters.znear, data.optics.parameters.zfar );
  						break;
  
  					default:
  						camera = new THREE.PerspectiveCamera();
  						break;
  
  				}
  
  				camera.name = data.name || '';
  				return camera;
  
  			}
  
  			function getCamera( id ) {
  
  				const data = library.cameras[ id ];
  
  				if ( data !== undefined ) {
  
  					return getBuild( data, buildCamera );
  
  				}
  
  				console.warn( 'THREE.ColladaLoader: Couldn\'t find camera with ID:', id );
  				return null;
  
  			} // light
  
  
  			function parseLight( xml ) {
  
  				let data = {};
  
  				for ( let i = 0, l = xml.childNodes.length; i < l; i ++ ) {
  
  					const child = xml.childNodes[ i ];
  					if ( child.nodeType !== 1 ) continue;
  
  					switch ( child.nodeName ) {
  
  						case 'technique_common':
  							data = parseLightTechnique( child );
  							break;
  
  					}
  
  				}
  
  				library.lights[ xml.getAttribute( 'id' ) ] = data;
  
  			}
  
  			function parseLightTechnique( xml ) {
  
  				const data = {};
  
  				for ( let i = 0, l = xml.childNodes.length; i < l; i ++ ) {
  
  					const child = xml.childNodes[ i ];
  					if ( child.nodeType !== 1 ) continue;
  
  					switch ( child.nodeName ) {
  
  						case 'directional':
  						case 'point':
  						case 'spot':
  						case 'ambient':
  							data.technique = child.nodeName;
  							data.parameters = parseLightParameters( child );
  
  					}
  
  				}
  
  				return data;
  
  			}
  
  			function parseLightParameters( xml ) {
  
  				const data = {};
  
  				for ( let i = 0, l = xml.childNodes.length; i < l; i ++ ) {
  
  					const child = xml.childNodes[ i ];
  					if ( child.nodeType !== 1 ) continue;
  
  					switch ( child.nodeName ) {
  
  						case 'color':
  							const array = parseFloats( child.textContent );
  							data.color = new THREE.Color().fromArray( array );
  							break;
  
  						case 'falloff_angle':
  							data.falloffAngle = parseFloat( child.textContent );
  							break;
  
  						case 'quadratic_attenuation':
  							const f = parseFloat( child.textContent );
  							data.distance = f ? Math.sqrt( 1 / f ) : 0;
  							break;
  
  					}
  
  				}
  
  				return data;
  
  			}
  
  			function buildLight( data ) {
  
  				let light;
  
  				switch ( data.technique ) {
  
  					case 'directional':
  						light = new THREE.DirectionalLight();
  						break;
  
  					case 'point':
  						light = new THREE.PointLight();
  						break;
  
  					case 'spot':
  						light = new THREE.SpotLight();
  						break;
  
  					case 'ambient':
  						light = new THREE.AmbientLight();
  						break;
  
  				}
  
  				if ( data.parameters.color ) light.color.copy( data.parameters.color );
  				if ( data.parameters.distance ) light.distance = data.parameters.distance;
  				return light;
  
  			}
  
  			function getLight( id ) {
  
  				const data = library.lights[ id ];
  
  				if ( data !== undefined ) {
  
  					return getBuild( data, buildLight );
  
  				}
  
  				console.warn( 'THREE.ColladaLoader: Couldn\'t find light with ID:', id );
  				return null;
  
  			} // geometry
  
  
  			function parseGeometry( xml ) {
  
  				const data = {
  					name: xml.getAttribute( 'name' ),
  					sources: {},
  					vertices: {},
  					primitives: []
  				};
  				const mesh = getElementsByTagName( xml, 'mesh' )[ 0 ]; // the following tags inside geometry are not supported yet (see https://github.com/mrdoob/three.js/pull/12606): convex_mesh, spline, brep
  
  				if ( mesh === undefined ) return;
  
  				for ( let i = 0; i < mesh.childNodes.length; i ++ ) {
  
  					const child = mesh.childNodes[ i ];
  					if ( child.nodeType !== 1 ) continue;
  					const id = child.getAttribute( 'id' );
  
  					switch ( child.nodeName ) {
  
  						case 'source':
  							data.sources[ id ] = parseSource( child );
  							break;
  
  						case 'vertices':
  							// data.sources[ id ] = data.sources[ parseId( getElementsByTagName( child, 'input' )[ 0 ].getAttribute( 'source' ) ) ];
  							data.vertices = parseGeometryVertices( child );
  							break;
  
  						case 'polygons':
  							console.warn( 'THREE.ColladaLoader: Unsupported primitive type: ', child.nodeName );
  							break;
  
  						case 'lines':
  						case 'linestrips':
  						case 'polylist':
  						case 'triangles':
  							data.primitives.push( parseGeometryPrimitive( child ) );
  							break;
  
  						default:
  							console.log( child );
  
  					}
  
  				}
  
  				library.geometries[ xml.getAttribute( 'id' ) ] = data;
  
  			}
  
  			function parseSource( xml ) {
  
  				const data = {
  					array: [],
  					stride: 3
  				};
  
  				for ( let i = 0; i < xml.childNodes.length; i ++ ) {
  
  					const child = xml.childNodes[ i ];
  					if ( child.nodeType !== 1 ) continue;
  
  					switch ( child.nodeName ) {
  
  						case 'float_array':
  							data.array = parseFloats( child.textContent );
  							break;
  
  						case 'Name_array':
  							data.array = parseStrings( child.textContent );
  							break;
  
  						case 'technique_common':
  							const accessor = getElementsByTagName( child, 'accessor' )[ 0 ];
  
  							if ( accessor !== undefined ) {
  
  								data.stride = parseInt( accessor.getAttribute( 'stride' ) );
  
  							}
  
  							break;
  
  					}
  
  				}
  
  				return data;
  
  			}
  
  			function parseGeometryVertices( xml ) {
  
  				const data = {};
  
  				for ( let i = 0; i < xml.childNodes.length; i ++ ) {
  
  					const child = xml.childNodes[ i ];
  					if ( child.nodeType !== 1 ) continue;
  					data[ child.getAttribute( 'semantic' ) ] = parseId( child.getAttribute( 'source' ) );
  
  				}
  
  				return data;
  
  			}
  
  			function parseGeometryPrimitive( xml ) {
  
  				const primitive = {
  					type: xml.nodeName,
  					material: xml.getAttribute( 'material' ),
  					count: parseInt( xml.getAttribute( 'count' ) ),
  					inputs: {},
  					stride: 0,
  					hasUV: false
  				};
  
  				for ( let i = 0, l = xml.childNodes.length; i < l; i ++ ) {
  
  					const child = xml.childNodes[ i ];
  					if ( child.nodeType !== 1 ) continue;
  
  					switch ( child.nodeName ) {
  
  						case 'input':
  							const id = parseId( child.getAttribute( 'source' ) );
  							const semantic = child.getAttribute( 'semantic' );
  							const offset = parseInt( child.getAttribute( 'offset' ) );
  							const set = parseInt( child.getAttribute( 'set' ) );
  							const inputname = set > 0 ? semantic + set : semantic;
  							primitive.inputs[ inputname ] = {
  								id: id,
  								offset: offset
  							};
  							primitive.stride = Math.max( primitive.stride, offset + 1 );
  							if ( semantic === 'TEXCOORD' ) primitive.hasUV = true;
  							break;
  
  						case 'vcount':
  							primitive.vcount = parseInts( child.textContent );
  							break;
  
  						case 'p':
  							primitive.p = parseInts( child.textContent );
  							break;
  
  					}
  
  				}
  
  				return primitive;
  
  			}
  
  			function groupPrimitives( primitives ) {
  
  				const build = {};
  
  				for ( let i = 0; i < primitives.length; i ++ ) {
  
  					const primitive = primitives[ i ];
  					if ( build[ primitive.type ] === undefined ) build[ primitive.type ] = [];
  					build[ primitive.type ].push( primitive );
  
  				}
  
  				return build;
  
  			}
  
  			function checkUVCoordinates( primitives ) {
  
  				let count = 0;
  
  				for ( let i = 0, l = primitives.length; i < l; i ++ ) {
  
  					const primitive = primitives[ i ];
  
  					if ( primitive.hasUV === true ) {
  
  						count ++;
  
  					}
  
  				}
  
  				if ( count > 0 && count < primitives.length ) {
  
  					primitives.uvsNeedsFix = true;
  
  				}
  
  			}
  
  			function buildGeometry( data ) {
  
  				const build = {};
  				const sources = data.sources;
  				const vertices = data.vertices;
  				const primitives = data.primitives;
  				if ( primitives.length === 0 ) return {}; // our goal is to create one buffer geometry for a single type of primitives
  				// first, we group all primitives by their type
  
  				const groupedPrimitives = groupPrimitives( primitives );
  
  				for ( const type in groupedPrimitives ) {
  
  					const primitiveType = groupedPrimitives[ type ]; // second, ensure consistent uv coordinates for each type of primitives (polylist,triangles or lines)
  
  					checkUVCoordinates( primitiveType ); // third, create a buffer geometry for each type of primitives
  
  					build[ type ] = buildGeometryType( primitiveType, sources, vertices );
  
  				}
  
  				return build;
  
  			}
  
  			function buildGeometryType( primitives, sources, vertices ) {
  
  				const build = {};
  				const position = {
  					array: [],
  					stride: 0
  				};
  				const normal = {
  					array: [],
  					stride: 0
  				};
  				const uv = {
  					array: [],
  					stride: 0
  				};
  				const uv2 = {
  					array: [],
  					stride: 0
  				};
  				const color = {
  					array: [],
  					stride: 0
  				};
  				const skinIndex = {
  					array: [],
  					stride: 4
  				};
  				const skinWeight = {
  					array: [],
  					stride: 4
  				};
  				const geometry = new THREE.BufferGeometry();
  				const materialKeys = [];
  				let start = 0;
  
  				for ( let p = 0; p < primitives.length; p ++ ) {
  
  					const primitive = primitives[ p ];
  					const inputs = primitive.inputs; // groups
  
  					let count = 0;
  
  					switch ( primitive.type ) {
  
  						case 'lines':
  						case 'linestrips':
  							count = primitive.count * 2;
  							break;
  
  						case 'triangles':
  							count = primitive.count * 3;
  							break;
  
  						case 'polylist':
  							for ( let g = 0; g < primitive.count; g ++ ) {
  
  								const vc = primitive.vcount[ g ];
  
  								switch ( vc ) {
  
  									case 3:
  										count += 3; // single triangle
  
  										break;
  
  									case 4:
  										count += 6; // quad, subdivided into two triangles
  
  										break;
  
  									default:
  										count += ( vc - 2 ) * 3; // polylist with more than four vertices
  
  										break;
  
  								}
  
  							}
  
  							break;
  
  						default:
  							console.warn( 'THREE.ColladaLoader: Unknow primitive type:', primitive.type );
  
  					}
  
  					geometry.addGroup( start, count, p );
  					start += count; // material
  
  					if ( primitive.material ) {
  
  						materialKeys.push( primitive.material );
  
  					} // geometry data
  
  
  					for ( const name in inputs ) {
  
  						const input = inputs[ name ];
  
  						switch ( name ) {
  
  							case 'VERTEX':
  								for ( const key in vertices ) {
  
  									const id = vertices[ key ];
  
  									switch ( key ) {
  
  										case 'POSITION':
  											const prevLength = position.array.length;
  											buildGeometryData( primitive, sources[ id ], input.offset, position.array );
  											position.stride = sources[ id ].stride;
  
  											if ( sources.skinWeights && sources.skinIndices ) {
  
  												buildGeometryData( primitive, sources.skinIndices, input.offset, skinIndex.array );
  												buildGeometryData( primitive, sources.skinWeights, input.offset, skinWeight.array );
  
  											} // see #3803
  
  
  											if ( primitive.hasUV === false && primitives.uvsNeedsFix === true ) {
  
  												const count = ( position.array.length - prevLength ) / position.stride;
  
  												for ( let i = 0; i < count; i ++ ) {
  
  													// fill missing uv coordinates
  													uv.array.push( 0, 0 );
  
  												}
  
  											}
  
  											break;
  
  										case 'NORMAL':
  											buildGeometryData( primitive, sources[ id ], input.offset, normal.array );
  											normal.stride = sources[ id ].stride;
  											break;
  
  										case 'COLOR':
  											buildGeometryData( primitive, sources[ id ], input.offset, color.array );
  											color.stride = sources[ id ].stride;
  											break;
  
  										case 'TEXCOORD':
  											buildGeometryData( primitive, sources[ id ], input.offset, uv.array );
  											uv.stride = sources[ id ].stride;
  											break;
  
  										case 'TEXCOORD1':
  											buildGeometryData( primitive, sources[ id ], input.offset, uv2.array );
  											uv.stride = sources[ id ].stride;
  											break;
  
  										default:
  											console.warn( 'THREE.ColladaLoader: Semantic "%s" not handled in geometry build process.', key );
  
  									}
  
  								}
  
  								break;
  
  							case 'NORMAL':
  								buildGeometryData( primitive, sources[ input.id ], input.offset, normal.array );
  								normal.stride = sources[ input.id ].stride;
  								break;
  
  							case 'COLOR':
  								buildGeometryData( primitive, sources[ input.id ], input.offset, color.array );
  								color.stride = sources[ input.id ].stride;
  								break;
  
  							case 'TEXCOORD':
  								buildGeometryData( primitive, sources[ input.id ], input.offset, uv.array );
  								uv.stride = sources[ input.id ].stride;
  								break;
  
  							case 'TEXCOORD1':
  								buildGeometryData( primitive, sources[ input.id ], input.offset, uv2.array );
  								uv2.stride = sources[ input.id ].stride;
  								break;
  
  						}
  
  					}
  
  				} // build geometry
  
  
  				if ( position.array.length > 0 ) geometry.setAttribute( 'position', new THREE.Float32BufferAttribute( position.array, position.stride ) );
  				if ( normal.array.length > 0 ) geometry.setAttribute( 'normal', new THREE.Float32BufferAttribute( normal.array, normal.stride ) );
  				if ( color.array.length > 0 ) geometry.setAttribute( 'color', new THREE.Float32BufferAttribute( color.array, color.stride ) );
  				if ( uv.array.length > 0 ) geometry.setAttribute( 'uv', new THREE.Float32BufferAttribute( uv.array, uv.stride ) );
  				if ( uv2.array.length > 0 ) geometry.setAttribute( 'uv2', new THREE.Float32BufferAttribute( uv2.array, uv2.stride ) );
  				if ( skinIndex.array.length > 0 ) geometry.setAttribute( 'skinIndex', new THREE.Float32BufferAttribute( skinIndex.array, skinIndex.stride ) );
  				if ( skinWeight.array.length > 0 ) geometry.setAttribute( 'skinWeight', new THREE.Float32BufferAttribute( skinWeight.array, skinWeight.stride ) );
  				build.data = geometry;
  				build.type = primitives[ 0 ].type;
  				build.materialKeys = materialKeys;
  				return build;
  
  			}
  
  			function buildGeometryData( primitive, source, offset, array ) {
  
  				const indices = primitive.p;
  				const stride = primitive.stride;
  				const vcount = primitive.vcount;
  
  				function pushVector( i ) {
  
  					let index = indices[ i + offset ] * sourceStride;
  					const length = index + sourceStride;
  
  					for ( ; index < length; index ++ ) {
  
  						array.push( sourceArray[ index ] );
  
  					}
  
  				}
  
  				const sourceArray = source.array;
  				const sourceStride = source.stride;
  
  				if ( primitive.vcount !== undefined ) {
  
  					let index = 0;
  
  					for ( let i = 0, l = vcount.length; i < l; i ++ ) {
  
  						const count = vcount[ i ];
  
  						if ( count === 4 ) {
  
  							const a = index + stride * 0;
  							const b = index + stride * 1;
  							const c = index + stride * 2;
  							const d = index + stride * 3;
  							pushVector( a );
  							pushVector( b );
  							pushVector( d );
  							pushVector( b );
  							pushVector( c );
  							pushVector( d );
  
  						} else if ( count === 3 ) {
  
  							const a = index + stride * 0;
  							const b = index + stride * 1;
  							const c = index + stride * 2;
  							pushVector( a );
  							pushVector( b );
  							pushVector( c );
  
  						} else if ( count > 4 ) {
  
  							for ( let k = 1, kl = count - 2; k <= kl; k ++ ) {
  
  								const a = index + stride * 0;
  								const b = index + stride * k;
  								const c = index + stride * ( k + 1 );
  								pushVector( a );
  								pushVector( b );
  								pushVector( c );
  
  							}
  
  						}
  
  						index += stride * count;
  
  					}
  
  				} else {
  
  					for ( let i = 0, l = indices.length; i < l; i += stride ) {
  
  						pushVector( i );
  
  					}
  
  				}
  
  			}
  
  			function getGeometry( id ) {
  
  				return getBuild( library.geometries[ id ], buildGeometry );
  
  			} // kinematics
  
  
  			function parseKinematicsModel( xml ) {
  
  				const data = {
  					name: xml.getAttribute( 'name' ) || '',
  					joints: {},
  					links: []
  				};
  
  				for ( let i = 0; i < xml.childNodes.length; i ++ ) {
  
  					const child = xml.childNodes[ i ];
  					if ( child.nodeType !== 1 ) continue;
  
  					switch ( child.nodeName ) {
  
  						case 'technique_common':
  							parseKinematicsTechniqueCommon( child, data );
  							break;
  
  					}
  
  				}
  
  				library.kinematicsModels[ xml.getAttribute( 'id' ) ] = data;
  
  			}
  
  			function buildKinematicsModel( data ) {
  
  				if ( data.build !== undefined ) return data.build;
  				return data;
  
  			}
  
  			function getKinematicsModel( id ) {
  
  				return getBuild( library.kinematicsModels[ id ], buildKinematicsModel );
  
  			}
  
  			function parseKinematicsTechniqueCommon( xml, data ) {
  
  				for ( let i = 0; i < xml.childNodes.length; i ++ ) {
  
  					const child = xml.childNodes[ i ];
  					if ( child.nodeType !== 1 ) continue;
  
  					switch ( child.nodeName ) {
  
  						case 'joint':
  							data.joints[ child.getAttribute( 'sid' ) ] = parseKinematicsJoint( child );
  							break;
  
  						case 'link':
  							data.links.push( parseKinematicsLink( child ) );
  							break;
  
  					}
  
  				}
  
  			}
  
  			function parseKinematicsJoint( xml ) {
  
  				let data;
  
  				for ( let i = 0; i < xml.childNodes.length; i ++ ) {
  
  					const child = xml.childNodes[ i ];
  					if ( child.nodeType !== 1 ) continue;
  
  					switch ( child.nodeName ) {
  
  						case 'prismatic':
  						case 'revolute':
  							data = parseKinematicsJointParameter( child );
  							break;
  
  					}
  
  				}
  
  				return data;
  
  			}
  
  			function parseKinematicsJointParameter( xml ) {
  
  				const data = {
  					sid: xml.getAttribute( 'sid' ),
  					name: xml.getAttribute( 'name' ) || '',
  					axis: new THREE.Vector3(),
  					limits: {
  						min: 0,
  						max: 0
  					},
  					type: xml.nodeName,
  					static: false,
  					zeroPosition: 0,
  					middlePosition: 0
  				};
  
  				for ( let i = 0; i < xml.childNodes.length; i ++ ) {
  
  					const child = xml.childNodes[ i ];
  					if ( child.nodeType !== 1 ) continue;
  
  					switch ( child.nodeName ) {
  
  						case 'axis':
  							const array = parseFloats( child.textContent );
  							data.axis.fromArray( array );
  							break;
  
  						case 'limits':
  							const max = child.getElementsByTagName( 'max' )[ 0 ];
  							const min = child.getElementsByTagName( 'min' )[ 0 ];
  							data.limits.max = parseFloat( max.textContent );
  							data.limits.min = parseFloat( min.textContent );
  							break;
  
  					}
  
  				} // if min is equal to or greater than max, consider the joint static
  
  
  				if ( data.limits.min >= data.limits.max ) {
  
  					data.static = true;
  
  				} // calculate middle position
  
  
  				data.middlePosition = ( data.limits.min + data.limits.max ) / 2.0;
  				return data;
  
  			}
  
  			function parseKinematicsLink( xml ) {
  
  				const data = {
  					sid: xml.getAttribute( 'sid' ),
  					name: xml.getAttribute( 'name' ) || '',
  					attachments: [],
  					transforms: []
  				};
  
  				for ( let i = 0; i < xml.childNodes.length; i ++ ) {
  
  					const child = xml.childNodes[ i ];
  					if ( child.nodeType !== 1 ) continue;
  
  					switch ( child.nodeName ) {
  
  						case 'attachment_full':
  							data.attachments.push( parseKinematicsAttachment( child ) );
  							break;
  
  						case 'matrix':
  						case 'translate':
  						case 'rotate':
  							data.transforms.push( parseKinematicsTransform( child ) );
  							break;
  
  					}
  
  				}
  
  				return data;
  
  			}
  
  			function parseKinematicsAttachment( xml ) {
  
  				const data = {
  					joint: xml.getAttribute( 'joint' ).split( '/' ).pop(),
  					transforms: [],
  					links: []
  				};
  
  				for ( let i = 0; i < xml.childNodes.length; i ++ ) {
  
  					const child = xml.childNodes[ i ];
  					if ( child.nodeType !== 1 ) continue;
  
  					switch ( child.nodeName ) {
  
  						case 'link':
  							data.links.push( parseKinematicsLink( child ) );
  							break;
  
  						case 'matrix':
  						case 'translate':
  						case 'rotate':
  							data.transforms.push( parseKinematicsTransform( child ) );
  							break;
  
  					}
  
  				}
  
  				return data;
  
  			}
  
  			function parseKinematicsTransform( xml ) {
  
  				const data = {
  					type: xml.nodeName
  				};
  				const array = parseFloats( xml.textContent );
  
  				switch ( data.type ) {
  
  					case 'matrix':
  						data.obj = new THREE.Matrix4();
  						data.obj.fromArray( array ).transpose();
  						break;
  
  					case 'translate':
  						data.obj = new THREE.Vector3();
  						data.obj.fromArray( array );
  						break;
  
  					case 'rotate':
  						data.obj = new THREE.Vector3();
  						data.obj.fromArray( array );
  						data.angle = THREE.MathUtils.degToRad( array[ 3 ] );
  						break;
  
  				}
  
  				return data;
  
  			} // physics
  
  
  			function parsePhysicsModel( xml ) {
  
  				const data = {
  					name: xml.getAttribute( 'name' ) || '',
  					rigidBodies: {}
  				};
  
  				for ( let i = 0; i < xml.childNodes.length; i ++ ) {
  
  					const child = xml.childNodes[ i ];
  					if ( child.nodeType !== 1 ) continue;
  
  					switch ( child.nodeName ) {
  
  						case 'rigid_body':
  							data.rigidBodies[ child.getAttribute( 'name' ) ] = {};
  							parsePhysicsRigidBody( child, data.rigidBodies[ child.getAttribute( 'name' ) ] );
  							break;
  
  					}
  
  				}
  
  				library.physicsModels[ xml.getAttribute( 'id' ) ] = data;
  
  			}
  
  			function parsePhysicsRigidBody( xml, data ) {
  
  				for ( let i = 0; i < xml.childNodes.length; i ++ ) {
  
  					const child = xml.childNodes[ i ];
  					if ( child.nodeType !== 1 ) continue;
  
  					switch ( child.nodeName ) {
  
  						case 'technique_common':
  							parsePhysicsTechniqueCommon( child, data );
  							break;
  
  					}
  
  				}
  
  			}
  
  			function parsePhysicsTechniqueCommon( xml, data ) {
  
  				for ( let i = 0; i < xml.childNodes.length; i ++ ) {
  
  					const child = xml.childNodes[ i ];
  					if ( child.nodeType !== 1 ) continue;
  
  					switch ( child.nodeName ) {
  
  						case 'inertia':
  							data.inertia = parseFloats( child.textContent );
  							break;
  
  						case 'mass':
  							data.mass = parseFloats( child.textContent )[ 0 ];
  							break;
  
  					}
  
  				}
  
  			} // scene
  
  
  			function parseKinematicsScene( xml ) {
  
  				const data = {
  					bindJointAxis: []
  				};
  
  				for ( let i = 0; i < xml.childNodes.length; i ++ ) {
  
  					const child = xml.childNodes[ i ];
  					if ( child.nodeType !== 1 ) continue;
  
  					switch ( child.nodeName ) {
  
  						case 'bind_joint_axis':
  							data.bindJointAxis.push( parseKinematicsBindJointAxis( child ) );
  							break;
  
  					}
  
  				}
  
  				library.kinematicsScenes[ parseId( xml.getAttribute( 'url' ) ) ] = data;
  
  			}
  
  			function parseKinematicsBindJointAxis( xml ) {
  
  				const data = {
  					target: xml.getAttribute( 'target' ).split( '/' ).pop()
  				};
  
  				for ( let i = 0; i < xml.childNodes.length; i ++ ) {
  
  					const child = xml.childNodes[ i ];
  					if ( child.nodeType !== 1 ) continue;
  
  					switch ( child.nodeName ) {
  
  						case 'axis':
  							const param = child.getElementsByTagName( 'param' )[ 0 ];
  							data.axis = param.textContent;
  							const tmpJointIndex = data.axis.split( 'inst_' ).pop().split( 'axis' )[ 0 ];
  							data.jointIndex = tmpJointIndex.substr( 0, tmpJointIndex.length - 1 );
  							break;
  
  					}
  
  				}
  
  				return data;
  
  			}
  
  			function buildKinematicsScene( data ) {
  
  				if ( data.build !== undefined ) return data.build;
  				return data;
  
  			}
  
  			function getKinematicsScene( id ) {
  
  				return getBuild( library.kinematicsScenes[ id ], buildKinematicsScene );
  
  			}
  
  			function setupKinematics() {
  
  				const kinematicsModelId = Object.keys( library.kinematicsModels )[ 0 ];
  				const kinematicsSceneId = Object.keys( library.kinematicsScenes )[ 0 ];
  				const visualSceneId = Object.keys( library.visualScenes )[ 0 ];
  				if ( kinematicsModelId === undefined || kinematicsSceneId === undefined ) return;
  				const kinematicsModel = getKinematicsModel( kinematicsModelId );
  				const kinematicsScene = getKinematicsScene( kinematicsSceneId );
  				const visualScene = getVisualScene( visualSceneId );
  				const bindJointAxis = kinematicsScene.bindJointAxis;
  				const jointMap = {};
  
  				for ( let i = 0, l = bindJointAxis.length; i < l; i ++ ) {
  
  					const axis = bindJointAxis[ i ]; // the result of the following query is an element of type 'translate', 'rotate','scale' or 'matrix'
  
  					const targetElement = collada.querySelector( '[sid="' + axis.target + '"]' );
  
  					if ( targetElement ) {
  
  						// get the parent of the transform element
  						const parentVisualElement = targetElement.parentElement; // connect the joint of the kinematics model with the element in the visual scene
  
  						connect( axis.jointIndex, parentVisualElement );
  
  					}
  
  				}
  
  				function connect( jointIndex, visualElement ) {
  
  					const visualElementName = visualElement.getAttribute( 'name' );
  					const joint = kinematicsModel.joints[ jointIndex ];
  					visualScene.traverse( function ( object ) {
  
  						if ( object.name === visualElementName ) {
  
  							jointMap[ jointIndex ] = {
  								object: object,
  								transforms: buildTransformList( visualElement ),
  								joint: joint,
  								position: joint.zeroPosition
  							};
  
  						}
  
  					} );
  
  				}
  
  				const m0 = new THREE.Matrix4();
  				kinematics = {
  					joints: kinematicsModel && kinematicsModel.joints,
  					getJointValue: function ( jointIndex ) {
  
  						const jointData = jointMap[ jointIndex ];
  
  						if ( jointData ) {
  
  							return jointData.position;
  
  						} else {
  
  							console.warn( 'THREE.ColladaLoader: Joint ' + jointIndex + ' doesn\'t exist.' );
  
  						}
  
  					},
  					setJointValue: function ( jointIndex, value ) {
  
  						const jointData = jointMap[ jointIndex ];
  
  						if ( jointData ) {
  
  							const joint = jointData.joint;
  
  							if ( value > joint.limits.max || value < joint.limits.min ) {
  
  								console.warn( 'THREE.ColladaLoader: Joint ' + jointIndex + ' value ' + value + ' outside of limits (min: ' + joint.limits.min + ', max: ' + joint.limits.max + ').' );
  
  							} else if ( joint.static ) {
  
  								console.warn( 'THREE.ColladaLoader: Joint ' + jointIndex + ' is static.' );
  
  							} else {
  
  								const object = jointData.object;
  								const axis = joint.axis;
  								const transforms = jointData.transforms;
  								matrix.identity(); // each update, we have to apply all transforms in the correct order
  
  								for ( let i = 0; i < transforms.length; i ++ ) {
  
  									const transform = transforms[ i ]; // if there is a connection of the transform node with a joint, apply the joint value
  
  									if ( transform.sid && transform.sid.indexOf( jointIndex ) !== - 1 ) {
  
  										switch ( joint.type ) {
  
  											case 'revolute':
  												matrix.multiply( m0.makeRotationAxis( axis, THREE.MathUtils.degToRad( value ) ) );
  												break;
  
  											case 'prismatic':
  												matrix.multiply( m0.makeTranslation( axis.x * value, axis.y * value, axis.z * value ) );
  												break;
  
  											default:
  												console.warn( 'THREE.ColladaLoader: Unknown joint type: ' + joint.type );
  												break;
  
  										}
  
  									} else {
  
  										switch ( transform.type ) {
  
  											case 'matrix':
  												matrix.multiply( transform.obj );
  												break;
  
  											case 'translate':
  												matrix.multiply( m0.makeTranslation( transform.obj.x, transform.obj.y, transform.obj.z ) );
  												break;
  
  											case 'scale':
  												matrix.scale( transform.obj );
  												break;
  
  											case 'rotate':
  												matrix.multiply( m0.makeRotationAxis( transform.obj, transform.angle ) );
  												break;
  
  										}
  
  									}
  
  								}
  
  								object.matrix.copy( matrix );
  								object.matrix.decompose( object.position, object.quaternion, object.scale );
  								jointMap[ jointIndex ].position = value;
  
  							}
  
  						} else {
  
  							console.log( 'THREE.ColladaLoader: ' + jointIndex + ' does not exist.' );
  
  						}
  
  					}
  				};
  
  			}
  
  			function buildTransformList( node ) {
  
  				const transforms = [];
  				const xml = collada.querySelector( '[id="' + node.id + '"]' );
  
  				for ( let i = 0; i < xml.childNodes.length; i ++ ) {
  
  					const child = xml.childNodes[ i ];
  					if ( child.nodeType !== 1 ) continue;
  					let array, vector;
  
  					switch ( child.nodeName ) {
  
  						case 'matrix':
  							array = parseFloats( child.textContent );
  							const matrix = new THREE.Matrix4().fromArray( array ).transpose();
  							transforms.push( {
  								sid: child.getAttribute( 'sid' ),
  								type: child.nodeName,
  								obj: matrix
  							} );
  							break;
  
  						case 'translate':
  						case 'scale':
  							array = parseFloats( child.textContent );
  							vector = new THREE.Vector3().fromArray( array );
  							transforms.push( {
  								sid: child.getAttribute( 'sid' ),
  								type: child.nodeName,
  								obj: vector
  							} );
  							break;
  
  						case 'rotate':
  							array = parseFloats( child.textContent );
  							vector = new THREE.Vector3().fromArray( array );
  							const angle = THREE.MathUtils.degToRad( array[ 3 ] );
  							transforms.push( {
  								sid: child.getAttribute( 'sid' ),
  								type: child.nodeName,
  								obj: vector,
  								angle: angle
  							} );
  							break;
  
  					}
  
  				}
  
  				return transforms;
  
  			} // nodes
  
  
  			function prepareNodes( xml ) {
  
  				const elements = xml.getElementsByTagName( 'node' ); // ensure all node elements have id attributes
  
  				for ( let i = 0; i < elements.length; i ++ ) {
  
  					const element = elements[ i ];
  
  					if ( element.hasAttribute( 'id' ) === false ) {
  
  						element.setAttribute( 'id', generateId() );
  
  					}
  
  				}
  
  			}
  
  			const matrix = new THREE.Matrix4();
  			const vector = new THREE.Vector3();
  
  			function parseNode( xml ) {
  
  				const data = {
  					name: xml.getAttribute( 'name' ) || '',
  					type: xml.getAttribute( 'type' ),
  					id: xml.getAttribute( 'id' ),
  					sid: xml.getAttribute( 'sid' ),
  					matrix: new THREE.Matrix4(),
  					nodes: [],
  					instanceCameras: [],
  					instanceControllers: [],
  					instanceLights: [],
  					instanceGeometries: [],
  					instanceNodes: [],
  					transforms: {}
  				};
  
  				for ( let i = 0; i < xml.childNodes.length; i ++ ) {
  
  					const child = xml.childNodes[ i ];
  					if ( child.nodeType !== 1 ) continue;
  					let array;
  
  					switch ( child.nodeName ) {
  
  						case 'node':
  							data.nodes.push( child.getAttribute( 'id' ) );
  							parseNode( child );
  							break;
  
  						case 'instance_camera':
  							data.instanceCameras.push( parseId( child.getAttribute( 'url' ) ) );
  							break;
  
  						case 'instance_controller':
  							data.instanceControllers.push( parseNodeInstance( child ) );
  							break;
  
  						case 'instance_light':
  							data.instanceLights.push( parseId( child.getAttribute( 'url' ) ) );
  							break;
  
  						case 'instance_geometry':
  							data.instanceGeometries.push( parseNodeInstance( child ) );
  							break;
  
  						case 'instance_node':
  							data.instanceNodes.push( parseId( child.getAttribute( 'url' ) ) );
  							break;
  
  						case 'matrix':
  							array = parseFloats( child.textContent );
  							data.matrix.multiply( matrix.fromArray( array ).transpose() );
  							data.transforms[ child.getAttribute( 'sid' ) ] = child.nodeName;
  							break;
  
  						case 'translate':
  							array = parseFloats( child.textContent );
  							vector.fromArray( array );
  							data.matrix.multiply( matrix.makeTranslation( vector.x, vector.y, vector.z ) );
  							data.transforms[ child.getAttribute( 'sid' ) ] = child.nodeName;
  							break;
  
  						case 'rotate':
  							array = parseFloats( child.textContent );
  							const angle = THREE.MathUtils.degToRad( array[ 3 ] );
  							data.matrix.multiply( matrix.makeRotationAxis( vector.fromArray( array ), angle ) );
  							data.transforms[ child.getAttribute( 'sid' ) ] = child.nodeName;
  							break;
  
  						case 'scale':
  							array = parseFloats( child.textContent );
  							data.matrix.scale( vector.fromArray( array ) );
  							data.transforms[ child.getAttribute( 'sid' ) ] = child.nodeName;
  							break;
  
  						case 'extra':
  							break;
  
  						default:
  							console.log( child );
  
  					}
  
  				}
  
  				if ( hasNode( data.id ) ) {
  
  					console.warn( 'THREE.ColladaLoader: There is already a node with ID %s. Exclude current node from further processing.', data.id );
  
  				} else {
  
  					library.nodes[ data.id ] = data;
  
  				}
  
  				return data;
  
  			}
  
  			function parseNodeInstance( xml ) {
  
  				const data = {
  					id: parseId( xml.getAttribute( 'url' ) ),
  					materials: {},
  					skeletons: []
  				};
  
  				for ( let i = 0; i < xml.childNodes.length; i ++ ) {
  
  					const child = xml.childNodes[ i ];
  
  					switch ( child.nodeName ) {
  
  						case 'bind_material':
  							const instances = child.getElementsByTagName( 'instance_material' );
  
  							for ( let j = 0; j < instances.length; j ++ ) {
  
  								const instance = instances[ j ];
  								const symbol = instance.getAttribute( 'symbol' );
  								const target = instance.getAttribute( 'target' );
  								data.materials[ symbol ] = parseId( target );
  
  							}
  
  							break;
  
  						case 'skeleton':
  							data.skeletons.push( parseId( child.textContent ) );
  							break;
  
  						default:
  							break;
  
  					}
  
  				}
  
  				return data;
  
  			}
  
  			function buildSkeleton( skeletons, joints ) {
  
  				const boneData = [];
  				const sortedBoneData = [];
  				let i, j, data; // a skeleton can have multiple root bones. collada expresses this
  				// situtation with multiple "skeleton" tags per controller instance
  
  				for ( i = 0; i < skeletons.length; i ++ ) {
  
  					const skeleton = skeletons[ i ];
  					let root;
  
  					if ( hasNode( skeleton ) ) {
  
  						root = getNode( skeleton );
  						buildBoneHierarchy( root, joints, boneData );
  
  					} else if ( hasVisualScene( skeleton ) ) {
  
  						// handle case where the skeleton refers to the visual scene (#13335)
  						const visualScene = library.visualScenes[ skeleton ];
  						const children = visualScene.children;
  
  						for ( let j = 0; j < children.length; j ++ ) {
  
  							const child = children[ j ];
  
  							if ( child.type === 'JOINT' ) {
  
  								const root = getNode( child.id );
  								buildBoneHierarchy( root, joints, boneData );
  
  							}
  
  						}
  
  					} else {
  
  						console.error( 'THREE.ColladaLoader: Unable to find root bone of skeleton with ID:', skeleton );
  
  					}
  
  				} // sort bone data (the order is defined in the corresponding controller)
  
  
  				for ( i = 0; i < joints.length; i ++ ) {
  
  					for ( j = 0; j < boneData.length; j ++ ) {
  
  						data = boneData[ j ];
  
  						if ( data.bone.name === joints[ i ].name ) {
  
  							sortedBoneData[ i ] = data;
  							data.processed = true;
  							break;
  
  						}
  
  					}
  
  				} // add unprocessed bone data at the end of the list
  
  
  				for ( i = 0; i < boneData.length; i ++ ) {
  
  					data = boneData[ i ];
  
  					if ( data.processed === false ) {
  
  						sortedBoneData.push( data );
  						data.processed = true;
  
  					}
  
  				} // setup arrays for skeleton creation
  
  
  				const bones = [];
  				const boneInverses = [];
  
  				for ( i = 0; i < sortedBoneData.length; i ++ ) {
  
  					data = sortedBoneData[ i ];
  					bones.push( data.bone );
  					boneInverses.push( data.boneInverse );
  
  				}
  
  				return new THREE.Skeleton( bones, boneInverses );
  
  			}
  
  			function buildBoneHierarchy( root, joints, boneData ) {
  
  				// setup bone data from visual scene
  				root.traverse( function ( object ) {
  
  					if ( object.isBone === true ) {
  
  						let boneInverse; // retrieve the boneInverse from the controller data
  
  						for ( let i = 0; i < joints.length; i ++ ) {
  
  							const joint = joints[ i ];
  
  							if ( joint.name === object.name ) {
  
  								boneInverse = joint.boneInverse;
  								break;
  
  							}
  
  						}
  
  						if ( boneInverse === undefined ) {
  
  							// Unfortunately, there can be joints in the visual scene that are not part of the
  							// corresponding controller. In this case, we have to create a dummy boneInverse matrix
  							// for the respective bone. This bone won't affect any vertices, because there are no skin indices
  							// and weights defined for it. But we still have to add the bone to the sorted bone list in order to
  							// ensure a correct animation of the model.
  							boneInverse = new THREE.Matrix4();
  
  						}
  
  						boneData.push( {
  							bone: object,
  							boneInverse: boneInverse,
  							processed: false
  						} );
  
  					}
  
  				} );
  
  			}
  
  			function buildNode( data ) {
  
  				const objects = [];
  				const matrix = data.matrix;
  				const nodes = data.nodes;
  				const type = data.type;
  				const instanceCameras = data.instanceCameras;
  				const instanceControllers = data.instanceControllers;
  				const instanceLights = data.instanceLights;
  				const instanceGeometries = data.instanceGeometries;
  				const instanceNodes = data.instanceNodes; // nodes
  
  				for ( let i = 0, l = nodes.length; i < l; i ++ ) {
  
  					objects.push( getNode( nodes[ i ] ) );
  
  				} // instance cameras
  
  
  				for ( let i = 0, l = instanceCameras.length; i < l; i ++ ) {
  
  					const instanceCamera = getCamera( instanceCameras[ i ] );
  
  					if ( instanceCamera !== null ) {
  
  						objects.push( instanceCamera.clone() );
  
  					}
  
  				} // instance controllers
  
  
  				for ( let i = 0, l = instanceControllers.length; i < l; i ++ ) {
  
  					const instance = instanceControllers[ i ];
  					const controller = getController( instance.id );
  					const geometries = getGeometry( controller.id );
  					const newObjects = buildObjects( geometries, instance.materials );
  					const skeletons = instance.skeletons;
  					const joints = controller.skin.joints;
  					const skeleton = buildSkeleton( skeletons, joints );
  
  					for ( let j = 0, jl = newObjects.length; j < jl; j ++ ) {
  
  						const object = newObjects[ j ];
  
  						if ( object.isSkinnedMesh ) {
  
  							object.bind( skeleton, controller.skin.bindMatrix );
  							object.normalizeSkinWeights();
  
  						}
  
  						objects.push( object );
  
  					}
  
  				} // instance lights
  
  
  				for ( let i = 0, l = instanceLights.length; i < l; i ++ ) {
  
  					const instanceLight = getLight( instanceLights[ i ] );
  
  					if ( instanceLight !== null ) {
  
  						objects.push( instanceLight.clone() );
  
  					}
  
  				} // instance geometries
  
  
  				for ( let i = 0, l = instanceGeometries.length; i < l; i ++ ) {
  
  					const instance = instanceGeometries[ i ]; // a single geometry instance in collada can lead to multiple object3Ds.
  					// this is the case when primitives are combined like triangles and lines
  
  					const geometries = getGeometry( instance.id );
  					const newObjects = buildObjects( geometries, instance.materials );
  
  					for ( let j = 0, jl = newObjects.length; j < jl; j ++ ) {
  
  						objects.push( newObjects[ j ] );
  
  					}
  
  				} // instance nodes
  
  
  				for ( let i = 0, l = instanceNodes.length; i < l; i ++ ) {
  
  					objects.push( getNode( instanceNodes[ i ] ).clone() );
  
  				}
  
  				let object;
  
  				if ( nodes.length === 0 && objects.length === 1 ) {
  
  					object = objects[ 0 ];
  
  				} else {
  
  					object = type === 'JOINT' ? new THREE.Bone() : new THREE.Group();
  
  					for ( let i = 0; i < objects.length; i ++ ) {
  
  						object.add( objects[ i ] );
  
  					}
  
  				}
  
  				object.name = type === 'JOINT' ? data.sid : data.name;
  				object.matrix.copy( matrix );
  				object.matrix.decompose( object.position, object.quaternion, object.scale );
  				return object;
  
  			}
  
  			const fallbackMaterial = new THREE.MeshBasicMaterial( {
  				color: 0xff00ff
  			} );
  
  			function resolveMaterialBinding( keys, instanceMaterials ) {
  
  				const materials = [];
  
  				for ( let i = 0, l = keys.length; i < l; i ++ ) {
  
  					const id = instanceMaterials[ keys[ i ] ];
  
  					if ( id === undefined ) {
  
  						console.warn( 'THREE.ColladaLoader: Material with key %s not found. Apply fallback material.', keys[ i ] );
  						materials.push( fallbackMaterial );
  
  					} else {
  
  						materials.push( getMaterial( id ) );
  
  					}
  
  				}
  
  				return materials;
  
  			}
  
  			function buildObjects( geometries, instanceMaterials ) {
  
  				const objects = [];
  
  				for ( const type in geometries ) {
  
  					const geometry = geometries[ type ];
  					const materials = resolveMaterialBinding( geometry.materialKeys, instanceMaterials ); // handle case if no materials are defined
  
  					if ( materials.length === 0 ) {
  
  						if ( type === 'lines' || type === 'linestrips' ) {
  
  							materials.push( new THREE.LineBasicMaterial() );
  
  						} else {
  
  							materials.push( new THREE.MeshPhongMaterial() );
  
  						}
  
  					} // regard skinning
  
  
  					const skinning = geometry.data.attributes.skinIndex !== undefined; // choose between a single or multi materials (material array)
  
  					const material = materials.length === 1 ? materials[ 0 ] : materials; // now create a specific 3D object
  
  					let object;
  
  					switch ( type ) {
  
  						case 'lines':
  							object = new THREE.LineSegments( geometry.data, material );
  							break;
  
  						case 'linestrips':
  							object = new THREE.Line( geometry.data, material );
  							break;
  
  						case 'triangles':
  						case 'polylist':
  							if ( skinning ) {
  
  								object = new THREE.SkinnedMesh( geometry.data, material );
  
  							} else {
  
  								object = new THREE.Mesh( geometry.data, material );
  
  							}
  
  							break;
  
  					}
  
  					objects.push( object );
  
  				}
  
  				return objects;
  
  			}
  
  			function hasNode( id ) {
  
  				return library.nodes[ id ] !== undefined;
  
  			}
  
  			function getNode( id ) {
  
  				return getBuild( library.nodes[ id ], buildNode );
  
  			} // visual scenes
  
  
  			function parseVisualScene( xml ) {
  
  				const data = {
  					name: xml.getAttribute( 'name' ),
  					children: []
  				};
  				prepareNodes( xml );
  				const elements = getElementsByTagName( xml, 'node' );
  
  				for ( let i = 0; i < elements.length; i ++ ) {
  
  					data.children.push( parseNode( elements[ i ] ) );
  
  				}
  
  				library.visualScenes[ xml.getAttribute( 'id' ) ] = data;
  
  			}
  
  			function buildVisualScene( data ) {
  
  				const group = new THREE.Group();
  				group.name = data.name;
  				const children = data.children;
  
  				for ( let i = 0; i < children.length; i ++ ) {
  
  					const child = children[ i ];
  					group.add( getNode( child.id ) );
  
  				}
  
  				return group;
  
  			}
  
  			function hasVisualScene( id ) {
  
  				return library.visualScenes[ id ] !== undefined;
  
  			}
  
  			function getVisualScene( id ) {
  
  				return getBuild( library.visualScenes[ id ], buildVisualScene );
  
  			} // scenes
  
  
  			function parseScene( xml ) {
  
  				const instance = getElementsByTagName( xml, 'instance_visual_scene' )[ 0 ];
  				return getVisualScene( parseId( instance.getAttribute( 'url' ) ) );
  
  			}
  
  			function setupAnimations() {
  
  				const clips = library.clips;
  
  				if ( isEmpty( clips ) === true ) {
  
  					if ( isEmpty( library.animations ) === false ) {
  
  						// if there are animations but no clips, we create a default clip for playback
  						const tracks = [];
  
  						for ( const id in library.animations ) {
  
  							const animationTracks = getAnimation( id );
  
  							for ( let i = 0, l = animationTracks.length; i < l; i ++ ) {
  
  								tracks.push( animationTracks[ i ] );
  
  							}
  
  						}
  
  						animations.push( new THREE.AnimationClip( 'default', - 1, tracks ) );
  
  					}
  
  				} else {
  
  					for ( const id in clips ) {
  
  						animations.push( getAnimationClip( id ) );
  
  					}
  
  				}
  
  			} // convert the parser error element into text with each child elements text
  			// separated by new lines.
  
  
  			function parserErrorToText( parserError ) {
  
  				let result = '';
  				const stack = [ parserError ];
  
  				while ( stack.length ) {
  
  					const node = stack.shift();
  
  					if ( node.nodeType === Node.TEXT_NODE ) {
  
  						result += node.textContent;
  
  					} else {
  
  						result += '\n';
  						stack.push.apply( stack, node.childNodes );
  
  					}
  
  				}
  
  				return result.trim();
  
  			}
  
  			if ( text.length === 0 ) {
  
  				return {
  					scene: new THREE.Scene()
  				};
  
  			}
  
  			const xml = new DOMParser().parseFromString( text, 'application/xml' );
  			const collada = getElementsByTagName( xml, 'COLLADA' )[ 0 ];
  			const parserError = xml.getElementsByTagName( 'parsererror' )[ 0 ];
  
  			if ( parserError !== undefined ) {
  
  				// Chrome will return parser error with a div in it
  				const errorElement = getElementsByTagName( parserError, 'div' )[ 0 ];
  				let errorText;
  
  				if ( errorElement ) {
  
  					errorText = errorElement.textContent;
  
  				} else {
  
  					errorText = parserErrorToText( parserError );
  
  				}
  
  				console.error( 'THREE.ColladaLoader: Failed to parse collada file.\n', errorText );
  				return null;
  
  			} // metadata
  
  
  			const version = collada.getAttribute( 'version' );
  			console.log( 'THREE.ColladaLoader: File version', version );
  			const asset = parseAsset( getElementsByTagName( collada, 'asset' )[ 0 ] );
  			const textureLoader = new THREE.TextureLoader( this.manager );
  			textureLoader.setPath( this.resourcePath || path ).setCrossOrigin( this.crossOrigin );
  			let tgaLoader;
  
  			if ( THREE.TGALoader ) {
  
  				tgaLoader = new THREE.TGALoader( this.manager );
  				tgaLoader.setPath( this.resourcePath || path );
  
  			} //
  
  
  			const animations = [];
  			let kinematics = {};
  			let count = 0; //
  
  			const library = {
  				animations: {},
  				clips: {},
  				controllers: {},
  				images: {},
  				effects: {},
  				materials: {},
  				cameras: {},
  				lights: {},
  				geometries: {},
  				nodes: {},
  				visualScenes: {},
  				kinematicsModels: {},
  				physicsModels: {},
  				kinematicsScenes: {}
  			};
  			parseLibrary( collada, 'library_animations', 'animation', parseAnimation );
  			parseLibrary( collada, 'library_animation_clips', 'animation_clip', parseAnimationClip );
  			parseLibrary( collada, 'library_controllers', 'controller', parseController );
  			parseLibrary( collada, 'library_images', 'image', parseImage );
  			parseLibrary( collada, 'library_effects', 'effect', parseEffect );
  			parseLibrary( collada, 'library_materials', 'material', parseMaterial );
  			parseLibrary( collada, 'library_cameras', 'camera', parseCamera );
  			parseLibrary( collada, 'library_lights', 'light', parseLight );
  			parseLibrary( collada, 'library_geometries', 'geometry', parseGeometry );
  			parseLibrary( collada, 'library_nodes', 'node', parseNode );
  			parseLibrary( collada, 'library_visual_scenes', 'visual_scene', parseVisualScene );
  			parseLibrary( collada, 'library_kinematics_models', 'kinematics_model', parseKinematicsModel );
  			parseLibrary( collada, 'library_physics_models', 'physics_model', parsePhysicsModel );
  			parseLibrary( collada, 'scene', 'instance_kinematics_scene', parseKinematicsScene );
  			buildLibrary( library.animations, buildAnimation );
  			buildLibrary( library.clips, buildAnimationClip );
  			buildLibrary( library.controllers, buildController );
  			buildLibrary( library.images, buildImage );
  			buildLibrary( library.effects, buildEffect );
  			buildLibrary( library.materials, buildMaterial );
  			buildLibrary( library.cameras, buildCamera );
  			buildLibrary( library.lights, buildLight );
  			buildLibrary( library.geometries, buildGeometry );
  			buildLibrary( library.visualScenes, buildVisualScene );
  			setupAnimations();
  			setupKinematics();
  			const scene = parseScene( getElementsByTagName( collada, 'scene' )[ 0 ] );
  			scene.animations = animations;
  
  			if ( asset.upAxis === 'Z_UP' ) {
  
  				scene.quaternion.setFromEuler( new THREE.Euler( - Math.PI / 2, 0, 0 ) );
  
  			}
  
  			scene.scale.multiplyScalar( asset.unit );
  			return {
  				get animations() {
  
  					console.warn( 'THREE.ColladaLoader: Please access animations over scene.animations now.' );
  					return animations;
  
  				},
  
  				kinematics: kinematics,
  				library: library,
  				scene: scene
  			};
  
  		}
  
  	}
  
  	THREE.ColladaLoader = ColladaLoader;
  
  } )();
  