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https://github.com/Doodle3D/Doodle3D-Slicer.git
synced 2024-07-05 10:20:44 +02:00
120 lines
2.2 KiB
JavaScript
Executable File
120 lines
2.2 KiB
JavaScript
Executable File
/*
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* @author zz85 / http://github.com/zz85
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* @author WestLangley / http://github.com/WestLangley
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*
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* tool for "unwrapping" and debugging three.js
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* geometries UV mapping
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*
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* Sample usage:
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* document.body.appendChild(
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* THREE.UVsDebug(
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* new THREE.SphereGeometry(10,10,10,10));
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*
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*/
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THREE.UVsDebug = function( geometry, size ) {
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// handles wrapping of uv.x > 1 only
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var abc = 'abcd';
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var uv, u, ax, ay;
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var i, il, j, jl;
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var vnum;
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var a = new THREE.Vector2();
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var b = new THREE.Vector2();
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var faces = geometry.faces;
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var uvs = geometry.faceVertexUvs[ 0 ];
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var canvas = document.createElement( 'canvas' );
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var width = size || 1024; // power of 2 required for wrapping
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var height = size || 1024;
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canvas.width = width;
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canvas.height = height;
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var ctx = canvas.getContext( '2d' );
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ctx.lineWidth = 2;
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ctx.strokeStyle = 'rgba( 0, 0, 0, 1.0 )';
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ctx.textAlign = 'center';
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// paint background white
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ctx.fillStyle = 'rgba( 255, 255, 255, 1.0 )';
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ctx.fillRect( 0, 0, width, height );
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for ( i = 0, il = uvs.length; i < il; i ++ ) {
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uv = uvs[ i ];
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// draw lines
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ctx.beginPath();
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a.set( 0, 0 );
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for ( j = 0, jl = uv.length; j < jl; j ++ ) {
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u = uv[ j ];
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a.x += u.x;
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a.y += u.y;
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if ( j == 0 ) {
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ctx.moveTo( u.x * width, ( 1 - u.y ) * height );
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} else {
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ctx.lineTo( u.x * width, ( 1 - u.y ) * height );
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}
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}
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ctx.closePath();
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ctx.stroke();
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a.divideScalar( jl );
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// label the face number
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ctx.font = "12pt Arial bold";
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ctx.fillStyle = 'rgba( 0, 0, 0, 1.0 )';
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ctx.fillText( i, a.x * width, ( 1 - a.y ) * height );
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if ( a.x > 0.95 ) { // wrap x // 0.95 is arbitrary
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ctx.fillText( i, ( a.x % 1 ) * width, ( 1 - a.y ) * height );
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}
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ctx.font = "8pt Arial bold";
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ctx.fillStyle = 'rgba( 0, 0, 0, 1.0 )';
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// label uv edge orders
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for ( j = 0, jl = uv.length; j < jl; j ++ ) {
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u = uv[ j ];
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b.addVectors( a, u ).divideScalar( 2 );
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vnum = faces[ i ][ abc[ j ] ];
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ctx.fillText( abc[ j ] + vnum, b.x * width, ( 1 - b.y ) * height );
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if ( b.x > 0.95 ) { // wrap x
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ctx.fillText( abc[ j ] + vnum, ( b.x % 1 ) * width, ( 1 - b.y ) * height );
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}
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}
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}
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return canvas;
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}
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