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487 lines
18 KiB
487 lines
18 KiB
( function () {
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/**
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* https://github.com/gkjohnson/collada-exporter-js
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*
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* Usage:
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* const exporter = new ColladaExporter();
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*
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* const data = exporter.parse(mesh);
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*
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* Format Definition:
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* https://www.khronos.org/collada/
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*/
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class ColladaExporter {
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parse( object, onDone, options = {} ) {
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options = Object.assign( {
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version: '1.4.1',
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author: null,
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textureDirectory: '',
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upAxis: 'Y_UP',
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unitName: null,
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unitMeter: null
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}, options );
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if ( options.upAxis.match( /^[XYZ]_UP$/ ) === null ) {
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console.error( 'ColladaExporter: Invalid upAxis: valid values are X_UP, Y_UP or Z_UP.' );
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return null;
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}
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if ( options.unitName !== null && options.unitMeter === null ) {
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console.error( 'ColladaExporter: unitMeter needs to be specified if unitName is specified.' );
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return null;
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}
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if ( options.unitMeter !== null && options.unitName === null ) {
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console.error( 'ColladaExporter: unitName needs to be specified if unitMeter is specified.' );
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return null;
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}
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if ( options.textureDirectory !== '' ) {
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options.textureDirectory = `${options.textureDirectory}/`.replace( /\\/g, '/' ).replace( /\/+/g, '/' );
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}
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const version = options.version;
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if ( version !== '1.4.1' && version !== '1.5.0' ) {
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console.warn( `ColladaExporter : Version ${version} not supported for export. Only 1.4.1 and 1.5.0.` );
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return null;
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}
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// Convert the urdf xml into a well-formatted, indented format
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function format( urdf ) {
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const IS_END_TAG = /^<\//;
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const IS_SELF_CLOSING = /(\?>$)|(\/>$)/;
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const HAS_TEXT = /<[^>]+>[^<]*<\/[^<]+>/;
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const pad = ( ch, num ) => num > 0 ? ch + pad( ch, num - 1 ) : '';
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let tagnum = 0;
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return urdf.match( /(<[^>]+>[^<]+<\/[^<]+>)|(<[^>]+>)/g ).map( tag => {
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if ( ! HAS_TEXT.test( tag ) && ! IS_SELF_CLOSING.test( tag ) && IS_END_TAG.test( tag ) ) {
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tagnum --;
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}
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const res = `${pad( ' ', tagnum )}${tag}`;
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if ( ! HAS_TEXT.test( tag ) && ! IS_SELF_CLOSING.test( tag ) && ! IS_END_TAG.test( tag ) ) {
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tagnum ++;
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}
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return res;
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} ).join( '\n' );
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}
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// Convert an image into a png format for saving
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function base64ToBuffer( str ) {
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const b = atob( str );
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const buf = new Uint8Array( b.length );
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for ( let i = 0, l = buf.length; i < l; i ++ ) {
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buf[ i ] = b.charCodeAt( i );
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}
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return buf;
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}
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let canvas, ctx;
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function imageToData( image, ext ) {
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canvas = canvas || document.createElement( 'canvas' );
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ctx = ctx || canvas.getContext( '2d' );
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canvas.width = image.width;
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canvas.height = image.height;
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ctx.drawImage( image, 0, 0 );
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// Get the base64 encoded data
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const base64data = canvas.toDataURL( `image/${ext}`, 1 ).replace( /^data:image\/(png|jpg);base64,/, '' );
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// Convert to a uint8 array
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return base64ToBuffer( base64data );
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}
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// gets the attribute array. Generate a new array if the attribute is interleaved
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const getFuncs = [ 'getX', 'getY', 'getZ', 'getW' ];
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const tempColor = new THREE.Color();
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function attrBufferToArray( attr, isColor = false ) {
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if ( isColor ) {
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// convert the colors to srgb before export
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// colors are always written as floats
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const arr = new Float32Array( attr.count * 3 );
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for ( let i = 0, l = attr.count; i < l; i ++ ) {
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tempColor.fromBufferAttribute( attr, i ).convertLinearToSRGB();
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arr[ 3 * i + 0 ] = tempColor.r;
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arr[ 3 * i + 1 ] = tempColor.g;
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arr[ 3 * i + 2 ] = tempColor.b;
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}
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return arr;
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} else if ( attr.isInterleavedBufferAttribute ) {
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// use the typed array constructor to save on memory
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const arr = new attr.array.constructor( attr.count * attr.itemSize );
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const size = attr.itemSize;
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for ( let i = 0, l = attr.count; i < l; i ++ ) {
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for ( let j = 0; j < size; j ++ ) {
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arr[ i * size + j ] = attr[ getFuncs[ j ] ]( i );
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}
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}
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return arr;
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} else {
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return attr.array;
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}
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}
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// Returns an array of the same type starting at the `st` index,
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// and `ct` length
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function subArray( arr, st, ct ) {
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if ( Array.isArray( arr ) ) return arr.slice( st, st + ct ); else return new arr.constructor( arr.buffer, st * arr.BYTES_PER_ELEMENT, ct );
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}
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// Returns the string for a geometry's attribute
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function getAttribute( attr, name, params, type, isColor = false ) {
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const array = attrBufferToArray( attr, isColor );
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const res = `<source id="${name}">` + `<float_array id="${name}-array" count="${array.length}">` + array.join( ' ' ) + '</float_array>' + '<technique_common>' + `<accessor source="#${name}-array" count="${Math.floor( array.length / attr.itemSize )}" stride="${attr.itemSize}">` + params.map( n => `<param name="${n}" type="${type}" />` ).join( '' ) + '</accessor>' + '</technique_common>' + '</source>';
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return res;
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}
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// Returns the string for a node's transform information
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let transMat;
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function getTransform( o ) {
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// ensure the object's matrix is up to date
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// before saving the transform
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o.updateMatrix();
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transMat = transMat || new THREE.Matrix4();
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transMat.copy( o.matrix );
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transMat.transpose();
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return `<matrix>${transMat.toArray().join( ' ' )}</matrix>`;
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}
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// Process the given piece of geometry into the geometry library
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// Returns the mesh id
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function processGeometry( bufferGeometry ) {
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let info = geometryInfo.get( bufferGeometry );
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if ( ! info ) {
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const meshid = `Mesh${libraryGeometries.length + 1}`;
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const indexCount = bufferGeometry.index ? bufferGeometry.index.count * bufferGeometry.index.itemSize : bufferGeometry.attributes.position.count;
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const groups = bufferGeometry.groups != null && bufferGeometry.groups.length !== 0 ? bufferGeometry.groups : [ {
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start: 0,
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count: indexCount,
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materialIndex: 0
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} ];
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const gname = bufferGeometry.name ? ` name="${bufferGeometry.name}"` : '';
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let gnode = `<geometry id="${meshid}"${gname}><mesh>`;
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// define the geometry node and the vertices for the geometry
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const posName = `${meshid}-position`;
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const vertName = `${meshid}-vertices`;
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gnode += getAttribute( bufferGeometry.attributes.position, posName, [ 'X', 'Y', 'Z' ], 'float' );
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gnode += `<vertices id="${vertName}"><input semantic="POSITION" source="#${posName}" /></vertices>`;
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// NOTE: We're not optimizing the attribute arrays here, so they're all the same length and
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// can therefore share the same triangle indices. However, MeshLab seems to have trouble opening
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// models with attributes that share an offset.
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// MeshLab Bug#424: https://sourceforge.net/p/meshlab/bugs/424/
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// serialize normals
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let triangleInputs = `<input semantic="VERTEX" source="#${vertName}" offset="0" />`;
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if ( 'normal' in bufferGeometry.attributes ) {
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const normName = `${meshid}-normal`;
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gnode += getAttribute( bufferGeometry.attributes.normal, normName, [ 'X', 'Y', 'Z' ], 'float' );
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triangleInputs += `<input semantic="NORMAL" source="#${normName}" offset="0" />`;
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}
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// serialize uvs
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if ( 'uv' in bufferGeometry.attributes ) {
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const uvName = `${meshid}-texcoord`;
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gnode += getAttribute( bufferGeometry.attributes.uv, uvName, [ 'S', 'T' ], 'float' );
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triangleInputs += `<input semantic="TEXCOORD" source="#${uvName}" offset="0" set="0" />`;
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}
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// serialize lightmap uvs
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if ( 'uv2' in bufferGeometry.attributes ) {
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const uvName = `${meshid}-texcoord2`;
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gnode += getAttribute( bufferGeometry.attributes.uv2, uvName, [ 'S', 'T' ], 'float' );
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triangleInputs += `<input semantic="TEXCOORD" source="#${uvName}" offset="0" set="1" />`;
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}
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// serialize colors
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if ( 'color' in bufferGeometry.attributes ) {
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// colors are always written as floats
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const colName = `${meshid}-color`;
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gnode += getAttribute( bufferGeometry.attributes.color, colName, [ 'R', 'G', 'B' ], 'float', true );
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triangleInputs += `<input semantic="COLOR" source="#${colName}" offset="0" />`;
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}
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let indexArray = null;
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if ( bufferGeometry.index ) {
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indexArray = attrBufferToArray( bufferGeometry.index );
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} else {
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indexArray = new Array( indexCount );
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for ( let i = 0, l = indexArray.length; i < l; i ++ ) indexArray[ i ] = i;
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}
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for ( let i = 0, l = groups.length; i < l; i ++ ) {
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const group = groups[ i ];
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const subarr = subArray( indexArray, group.start, group.count );
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const polycount = subarr.length / 3;
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gnode += `<triangles material="MESH_MATERIAL_${group.materialIndex}" count="${polycount}">`;
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gnode += triangleInputs;
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gnode += `<p>${subarr.join( ' ' )}</p>`;
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gnode += '</triangles>';
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}
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gnode += '</mesh></geometry>';
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libraryGeometries.push( gnode );
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info = {
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meshid: meshid,
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bufferGeometry: bufferGeometry
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};
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geometryInfo.set( bufferGeometry, info );
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}
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return info;
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}
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// Process the given texture into the image library
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// Returns the image library
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function processTexture( tex ) {
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let texid = imageMap.get( tex );
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if ( texid == null ) {
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texid = `image-${libraryImages.length + 1}`;
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const ext = 'png';
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const name = tex.name || texid;
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let imageNode = `<image id="${texid}" name="${name}">`;
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if ( version === '1.5.0' ) {
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imageNode += `<init_from><ref>${options.textureDirectory}${name}.${ext}</ref></init_from>`;
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} else {
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// version image node 1.4.1
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imageNode += `<init_from>${options.textureDirectory}${name}.${ext}</init_from>`;
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}
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imageNode += '</image>';
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libraryImages.push( imageNode );
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imageMap.set( tex, texid );
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textures.push( {
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directory: options.textureDirectory,
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name,
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ext,
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data: imageToData( tex.image, ext ),
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original: tex
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} );
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}
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return texid;
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}
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// Process the given material into the material and effect libraries
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// Returns the material id
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function processMaterial( m ) {
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let matid = materialMap.get( m );
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if ( matid == null ) {
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matid = `Mat${libraryEffects.length + 1}`;
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let type = 'phong';
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if ( m.isMeshLambertMaterial === true ) {
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type = 'lambert';
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} else if ( m.isMeshBasicMaterial === true ) {
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type = 'constant';
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if ( m.map !== null ) {
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// The Collada spec does not support diffuse texture maps with the
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// constant shader type.
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// mrdoob/three.js#15469
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console.warn( 'ColladaExporter: Texture maps not supported with THREE.MeshBasicMaterial.' );
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}
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}
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const emissive = m.emissive ? m.emissive : new THREE.Color( 0, 0, 0 );
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const diffuse = m.color ? m.color : new THREE.Color( 0, 0, 0 );
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const specular = m.specular ? m.specular : new THREE.Color( 1, 1, 1 );
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const shininess = m.shininess || 0;
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const reflectivity = m.reflectivity || 0;
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emissive.convertLinearToSRGB();
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specular.convertLinearToSRGB();
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diffuse.convertLinearToSRGB();
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// Do not export and alpha map for the reasons mentioned in issue (#13792)
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// in three.js alpha maps are black and white, but collada expects the alpha
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// channel to specify the transparency
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let transparencyNode = '';
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if ( m.transparent === true ) {
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transparencyNode += '<transparent>' + ( m.map ? '<texture texture="diffuse-sampler"></texture>' : '<float>1</float>' ) + '</transparent>';
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if ( m.opacity < 1 ) {
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transparencyNode += `<transparency><float>${m.opacity}</float></transparency>`;
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}
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}
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const techniqueNode = `<technique sid="common"><${type}>` + '<emission>' + ( m.emissiveMap ? '<texture texture="emissive-sampler" texcoord="TEXCOORD" />' : `<color sid="emission">${emissive.r} ${emissive.g} ${emissive.b} 1</color>` ) + '</emission>' + ( type !== 'constant' ? '<diffuse>' + ( m.map ? '<texture texture="diffuse-sampler" texcoord="TEXCOORD" />' : `<color sid="diffuse">${diffuse.r} ${diffuse.g} ${diffuse.b} 1</color>` ) + '</diffuse>' : '' ) + ( type !== 'constant' ? '<bump>' + ( m.normalMap ? '<texture texture="bump-sampler" texcoord="TEXCOORD" />' : '' ) + '</bump>' : '' ) + ( type === 'phong' ? `<specular><color sid="specular">${specular.r} ${specular.g} ${specular.b} 1</color></specular>` + '<shininess>' + ( m.specularMap ? '<texture texture="specular-sampler" texcoord="TEXCOORD" />' : `<float sid="shininess">${shininess}</float>` ) + '</shininess>' : '' ) + `<reflective><color>${diffuse.r} ${diffuse.g} ${diffuse.b} 1</color></reflective>` + `<reflectivity><float>${reflectivity}</float></reflectivity>` + transparencyNode + `</${type}></technique>`;
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const effectnode = `<effect id="${matid}-effect">` + '<profile_COMMON>' + ( m.map ? '<newparam sid="diffuse-surface"><surface type="2D">' + `<init_from>${processTexture( m.map )}</init_from>` + '</surface></newparam>' + '<newparam sid="diffuse-sampler"><sampler2D><source>diffuse-surface</source></sampler2D></newparam>' : '' ) + ( m.specularMap ? '<newparam sid="specular-surface"><surface type="2D">' + `<init_from>${processTexture( m.specularMap )}</init_from>` + '</surface></newparam>' + '<newparam sid="specular-sampler"><sampler2D><source>specular-surface</source></sampler2D></newparam>' : '' ) + ( m.emissiveMap ? '<newparam sid="emissive-surface"><surface type="2D">' + `<init_from>${processTexture( m.emissiveMap )}</init_from>` + '</surface></newparam>' + '<newparam sid="emissive-sampler"><sampler2D><source>emissive-surface</source></sampler2D></newparam>' : '' ) + ( m.normalMap ? '<newparam sid="bump-surface"><surface type="2D">' + `<init_from>${processTexture( m.normalMap )}</init_from>` + '</surface></newparam>' + '<newparam sid="bump-sampler"><sampler2D><source>bump-surface</source></sampler2D></newparam>' : '' ) + techniqueNode + ( m.side === THREE.DoubleSide ? '<extra><technique profile="THREEJS"><double_sided sid="double_sided" type="int">1</double_sided></technique></extra>' : '' ) + '</profile_COMMON>' + '</effect>';
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const materialName = m.name ? ` name="${m.name}"` : '';
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const materialNode = `<material id="${matid}"${materialName}><instance_effect url="#${matid}-effect" /></material>`;
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libraryMaterials.push( materialNode );
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libraryEffects.push( effectnode );
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materialMap.set( m, matid );
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}
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return matid;
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}
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// Recursively process the object into a scene
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function processObject( o ) {
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let node = `<node name="${o.name}">`;
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node += getTransform( o );
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if ( o.isMesh === true && o.geometry !== null ) {
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// function returns the id associated with the mesh and a "BufferGeometry" version
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// of the geometry in case it's not a geometry.
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const geomInfo = processGeometry( o.geometry );
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const meshid = geomInfo.meshid;
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const geometry = geomInfo.bufferGeometry;
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// ids of the materials to bind to the geometry
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let matids = null;
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let matidsArray;
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// get a list of materials to bind to the sub groups of the geometry.
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// If the amount of subgroups is greater than the materials, than reuse
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// the materials.
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const mat = o.material || new THREE.MeshBasicMaterial();
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const materials = Array.isArray( mat ) ? mat : [ mat ];
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if ( geometry.groups.length > materials.length ) {
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matidsArray = new Array( geometry.groups.length );
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} else {
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matidsArray = new Array( materials.length );
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}
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matids = matidsArray.fill().map( ( v, i ) => processMaterial( materials[ i % materials.length ] ) );
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node += `<instance_geometry url="#${meshid}">` + ( matids.length > 0 ? '<bind_material><technique_common>' + matids.map( ( id, i ) => `<instance_material symbol="MESH_MATERIAL_${i}" target="#${id}" >` + '<bind_vertex_input semantic="TEXCOORD" input_semantic="TEXCOORD" input_set="0" />' + '</instance_material>' ).join( '' ) + '</technique_common></bind_material>' : '' ) + '</instance_geometry>';
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}
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o.children.forEach( c => node += processObject( c ) );
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node += '</node>';
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return node;
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}
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const geometryInfo = new WeakMap();
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const materialMap = new WeakMap();
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const imageMap = new WeakMap();
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const textures = [];
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const libraryImages = [];
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const libraryGeometries = [];
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const libraryEffects = [];
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const libraryMaterials = [];
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const libraryVisualScenes = processObject( object );
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const specLink = version === '1.4.1' ? 'http://www.collada.org/2005/11/COLLADASchema' : 'https://www.khronos.org/collada/';
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let dae = '<?xml version="1.0" encoding="UTF-8" standalone="no" ?>' + `<COLLADA xmlns="${specLink}" version="${version}">` + '<asset>' + ( '<contributor>' + '<authoring_tool>three.js Collada Exporter</authoring_tool>' + ( options.author !== null ? `<author>${options.author}</author>` : '' ) + '</contributor>' + `<created>${new Date().toISOString()}</created>` + `<modified>${new Date().toISOString()}</modified>` + ( options.unitName !== null ? `<unit name="${options.unitName}" meter="${options.unitMeter}" />` : '' ) + `<up_axis>${options.upAxis}</up_axis>` ) + '</asset>';
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dae += `<library_images>${libraryImages.join( '' )}</library_images>`;
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dae += `<library_effects>${libraryEffects.join( '' )}</library_effects>`;
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dae += `<library_materials>${libraryMaterials.join( '' )}</library_materials>`;
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dae += `<library_geometries>${libraryGeometries.join( '' )}</library_geometries>`;
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dae += `<library_visual_scenes><visual_scene id="Scene" name="scene">${libraryVisualScenes}</visual_scene></library_visual_scenes>`;
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dae += '<scene><instance_visual_scene url="#Scene"/></scene>';
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dae += '</COLLADA>';
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const res = {
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data: format( dae ),
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textures
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};
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if ( typeof onDone === 'function' ) {
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requestAnimationFrame( () => onDone( res ) );
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}
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return res;
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}
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}
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THREE.ColladaExporter = ColladaExporter;
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} )();
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