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/**
* @author mrdoob / http://mrdoob.com/
* @author WestLangley / http://github.com/WestLangley
*/
import { Matrix3 } from '../math/Matrix3.js';
import { Vector3 } from '../math/Vector3.js';
import { LineSegments } from '../objects/LineSegments.js';
import { LineBasicMaterial } from '../materials/LineBasicMaterial.js';
import { Float32BufferAttribute } from '../core/BufferAttribute.js';
import { BufferGeometry } from '../core/BufferGeometry.js';
function FaceNormalsHelper( object, size, hex, linewidth ) {
// FaceNormalsHelper only supports THREE.Geometry
this.object = object;
this.size = ( size !== undefined ) ? size : 1;
var color = ( hex !== undefined ) ? hex : 0xffff00;
var width = ( linewidth !== undefined ) ? linewidth : 1;
//
var nNormals = 0;
var objGeometry = this.object.geometry;
if ( objGeometry && objGeometry.isGeometry ) {
nNormals = objGeometry.faces.length;
} else {
console.warn( 'THREE.FaceNormalsHelper: only THREE.Geometry is supported. Use THREE.VertexNormalsHelper, instead.' );
}
//
var geometry = new BufferGeometry();
var positions = new Float32BufferAttribute( nNormals * 2 * 3, 3 );
geometry.addAttribute( 'position', positions );
LineSegments.call( this, geometry, new LineBasicMaterial( { color: color, linewidth: width } ) );
//
this.matrixAutoUpdate = false;
this.update();
}
FaceNormalsHelper.prototype = Object.create( LineSegments.prototype );
FaceNormalsHelper.prototype.constructor = FaceNormalsHelper;
FaceNormalsHelper.prototype.update = ( function () {
var v1 = new Vector3();
var v2 = new Vector3();
var normalMatrix = new Matrix3();
return function update() {
this.object.updateMatrixWorld( true );
normalMatrix.getNormalMatrix( this.object.matrixWorld );
var matrixWorld = this.object.matrixWorld;
var position = this.geometry.attributes.position;
//
var objGeometry = this.object.geometry;
var vertices = objGeometry.vertices;
var faces = objGeometry.faces;
var idx = 0;
for ( var i = 0, l = faces.length; i < l; i ++ ) {
var face = faces[ i ];
var normal = face.normal;
v1.copy( vertices[ face.a ] )
.add( vertices[ face.b ] )
.add( vertices[ face.c ] )
.divideScalar( 3 )
.applyMatrix4( matrixWorld );
v2.copy( normal ).applyMatrix3( normalMatrix ).normalize().multiplyScalar( this.size ).add( v1 );
position.setXYZ( idx, v1.x, v1.y, v1.z );
idx = idx + 1;
position.setXYZ( idx, v2.x, v2.y, v2.z );
idx = idx + 1;
}
position.needsUpdate = true;
};
}() );
export { FaceNormalsHelper };
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