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/*
* @author zz85 / http://github.com/zz85
* @author WestLangley / http://github.com/WestLangley
* @author Mugen87 / https://github.com/Mugen87
*
* tool for "unwrapping" and debugging three.js geometries UV mapping
*
* Sample usage:
* document.body.appendChild( THREE.UVsDebug( new THREE.SphereBufferGeometry( 10, 10, 10, 10 ) );
*
*/
THREE.UVsDebug = function ( geometry, size ) {
// handles wrapping of uv.x > 1 only
var abc = 'abc';
var a = new THREE.Vector2();
var b = new THREE.Vector2();
var uvs = [
new THREE.Vector2(),
new THREE.Vector2(),
new THREE.Vector2()
];
var face = [];
var canvas = document.createElement( 'canvas' );
var width = size || 1024; // power of 2 required for wrapping
var height = size || 1024;
canvas.width = width;
canvas.height = height;
var ctx = canvas.getContext( '2d' );
ctx.lineWidth = 2;
ctx.strokeStyle = 'rgba( 0, 0, 0, 1.0 )';
ctx.textAlign = 'center';
// paint background white
ctx.fillStyle = 'rgba( 255, 255, 255, 1.0 )';
ctx.fillRect( 0, 0, width, height );
if ( geometry.isGeometry ) {
var faces = geometry.faces;
var uvSet = geometry.faceVertexUvs[ 0 ];
for ( var i = 0, il = uvSet.length; i < il; i ++ ) {
var face = faces[ i ];
var uv = uvSet[ i ];
face[ 0 ] = face.a;
face[ 1 ] = face.b;
face[ 2 ] = face.c;
uvs[ 0 ].copy( uv[ 0 ] );
uvs[ 1 ].copy( uv[ 1 ] );
uvs[ 2 ].copy( uv[ 2 ] );
processFace( face, uvs, i );
}
} else {
var index = geometry.index;
var uvAttribute = geometry.attributes.uv;
if ( index ) {
// indexed geometry
for ( var i = 0, il = index.count; i < il; i += 3 ) {
face[ 0 ] = index.getX( i );
face[ 1 ] = index.getX( i + 1 );
face[ 2 ] = index.getX( i + 2 );
uvs[ 0 ].fromBufferAttribute( uvAttribute, face[ 0 ] );
uvs[ 1 ].fromBufferAttribute( uvAttribute, face[ 1 ] );
uvs[ 2 ].fromBufferAttribute( uvAttribute, face[ 2 ] );
processFace( face, uvs, i / 3 );
}
} else {
// non-indexed geometry
for ( var i = 0, il = uvAttribute.count; i < il; i += 3 ) {
face[ 0 ] = i;
face[ 1 ] = i + 1;
face[ 2 ] = i + 2;
uvs[ 0 ].fromBufferAttribute( uvAttribute, face[ 0 ] );
uvs[ 1 ].fromBufferAttribute( uvAttribute, face[ 1 ] );
uvs[ 2 ].fromBufferAttribute( uvAttribute, face[ 2 ] );
processFace( face, uvs, i / 3 );
}
}
}
return canvas;
function processFace( face, uvs, index ) {
// draw contour of face
ctx.beginPath();
a.set( 0, 0 );
for ( var j = 0, jl = uvs.length; j < jl; j ++ ) {
var uv = uvs[ j ];
a.x += uv.x;
a.y += uv.y;
if ( j === 0 ) {
ctx.moveTo( uv.x * width, ( 1 - uv.y ) * height );
} else {
ctx.lineTo( uv.x * width, ( 1 - uv.y ) * height );
}
}
ctx.closePath();
ctx.stroke();
// calculate center of face
a.divideScalar( uvs.length );
// label the face number
ctx.font = '12pt Arial bold';
ctx.fillStyle = 'rgba( 0, 0, 0, 1.0 )';
ctx.fillText( index, a.x * width, ( 1 - a.y ) * height );
if ( a.x > 0.95 ) {
// wrap x // 0.95 is arbitrary
ctx.fillText( index, ( a.x % 1 ) * width, ( 1 - a.y ) * height );
}
//
ctx.font = '8pt Arial bold';
ctx.fillStyle = 'rgba( 0, 0, 0, 1.0 )';
// label uv edge orders
for ( j = 0, jl = uvs.length; j < jl; j ++ ) {
var uv = uvs[ j ];
b.addVectors( a, uv ).divideScalar( 2 );
var vnum = face[ j ];
ctx.fillText( abc[ j ] + vnum, b.x * width, ( 1 - b.y ) * height );
if ( b.x > 0.95 ) {
// wrap x
ctx.fillText( abc[ j ] + vnum, ( b.x % 1 ) * width, ( 1 - b.y ) * height );
}
}
}
};
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