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713 lines
18 KiB
713 lines
18 KiB
import {
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Color,
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DoubleSide,
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Matrix4,
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MeshBasicMaterial
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} from 'three';
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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 }/`
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.replace( /\\/g, '/' )
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.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 ${ version } not supported for export. Only 1.4.1 and 1.5.0.` );
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return null;
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}
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// Convert the urdf xml into a well-formatted, indented format
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function format( urdf ) {
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const IS_END_TAG = /^<\//;
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const IS_SELF_CLOSING = /(\?>$)|(\/>$)/;
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const HAS_TEXT = /<[^>]+>[^<]*<\/[^<]+>/;
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const pad = ( ch, num ) => ( num > 0 ? ch + pad( ch, num - 1 ) : '' );
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let tagnum = 0;
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return urdf
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.match( /(<[^>]+>[^<]+<\/[^<]+>)|(<[^>]+>)/g )
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.map( tag => {
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if ( ! HAS_TEXT.test( tag ) && ! IS_SELF_CLOSING.test( tag ) && IS_END_TAG.test( tag ) ) {
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tagnum --;
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}
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const res = `${ 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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} )
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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
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.toDataURL( `image/${ ext }`, 1 )
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.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 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
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.fromBufferAttribute( attr, i )
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.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 );
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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 =
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`<source id="${ name }">` +
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`<float_array id="${ name }-array" count="${ array.length }">` +
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array.join( ' ' ) +
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'</float_array>' +
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'<technique_common>' +
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`<accessor source="#${ name }-array" count="${ Math.floor( array.length / attr.itemSize ) }" stride="${ attr.itemSize }">` +
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params.map( n => `<param name="${ n }" type="${ type }" />` ).join( '' ) +
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'</accessor>' +
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'</technique_common>' +
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'</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 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 =
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bufferGeometry.index ?
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bufferGeometry.index.count * bufferGeometry.index.itemSize :
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bufferGeometry.attributes.position.count;
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const groups =
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bufferGeometry.groups != null && bufferGeometry.groups.length !== 0 ?
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bufferGeometry.groups :
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[ { start: 0, count: indexCount, materialIndex: 0 } ];
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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>${ subarr.join( ' ' ) }</p>`;
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gnode += '</triangles>';
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}
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gnode += '</mesh></geometry>';
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libraryGeometries.push( gnode );
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info = { meshid: meshid, bufferGeometry: bufferGeometry };
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geometryInfo.set( bufferGeometry, info );
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}
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return info;
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}
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// Process the given texture into the image library
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// Returns the image library
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function processTexture( tex ) {
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let texid = imageMap.get( tex );
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if ( texid == null ) {
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texid = `image-${ 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 MeshBasicMaterial.' );
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}
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}
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const emissive = m.emissive ? m.emissive : new Color( 0, 0, 0 );
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const diffuse = m.color ? m.color : new Color( 0, 0, 0 );
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const specular = m.specular ? m.specular : new 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 +=
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'<transparent>' +
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(
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m.map ?
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'<texture texture="diffuse-sampler"></texture>' :
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'<float>1</float>'
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) +
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'</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"><${ type }>` +
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'<emission>' +
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(
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m.emissiveMap ?
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'<texture texture="emissive-sampler" texcoord="TEXCOORD" />' :
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`<color sid="emission">${ emissive.r } ${ emissive.g } ${ emissive.b } 1</color>`
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) +
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'</emission>' +
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(
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type !== 'constant' ?
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'<diffuse>' +
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(
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m.map ?
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'<texture texture="diffuse-sampler" texcoord="TEXCOORD" />' :
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`<color sid="diffuse">${ diffuse.r } ${ diffuse.g } ${ diffuse.b } 1</color>`
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) +
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'</diffuse>'
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: ''
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) +
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(
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type !== 'constant' ?
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'<bump>' +
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(
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m.normalMap ? '<texture texture="bump-sampler" texcoord="TEXCOORD" />' : ''
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) +
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'</bump>'
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: ''
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) +
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(
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type === 'phong' ?
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`<specular><color sid="specular">${ specular.r } ${ specular.g } ${ specular.b } 1</color></specular>` +
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'<shininess>' +
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(
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m.specularMap ?
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'<texture texture="specular-sampler" texcoord="TEXCOORD" />' :
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`<float sid="shininess">${ shininess }</float>`
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) +
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'</shininess>'
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: ''
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) +
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`<reflective><color>${ diffuse.r } ${ diffuse.g } ${ diffuse.b } 1</color></reflective>` +
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`<reflectivity><float>${ reflectivity }</float></reflectivity>` +
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transparencyNode +
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`</${ type }></technique>`;
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const effectnode =
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`<effect id="${ matid }-effect">` +
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'<profile_COMMON>' +
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(
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m.map ?
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'<newparam sid="diffuse-surface"><surface type="2D">' +
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`<init_from>${ processTexture( m.map ) }</init_from>` +
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'</surface></newparam>' +
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'<newparam sid="diffuse-sampler"><sampler2D><source>diffuse-surface</source></sampler2D></newparam>' :
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''
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) +
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(
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m.specularMap ?
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'<newparam sid="specular-surface"><surface type="2D">' +
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`<init_from>${ processTexture( m.specularMap ) }</init_from>` +
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'</surface></newparam>' +
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'<newparam sid="specular-sampler"><sampler2D><source>specular-surface</source></sampler2D></newparam>' :
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''
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) +
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(
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m.emissiveMap ?
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'<newparam sid="emissive-surface"><surface type="2D">' +
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`<init_from>${ processTexture( m.emissiveMap ) }</init_from>` +
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'</surface></newparam>' +
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'<newparam sid="emissive-sampler"><sampler2D><source>emissive-surface</source></sampler2D></newparam>' :
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''
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) +
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(
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m.normalMap ?
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'<newparam sid="bump-surface"><surface type="2D">' +
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`<init_from>${ processTexture( m.normalMap ) }</init_from>` +
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'</surface></newparam>' +
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'<newparam sid="bump-sampler"><sampler2D><source>bump-surface</source></sampler2D></newparam>' :
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''
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) +
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techniqueNode +
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(
|
|
m.side === DoubleSide ?
|
|
'<extra><technique profile="THREEJS"><double_sided sid="double_sided" type="int">1</double_sided></technique></extra>' :
|
|
''
|
|
) +
|
|
|
|
'</profile_COMMON>' +
|
|
|
|
'</effect>';
|
|
|
|
const materialName = m.name ? ` name="${ m.name }"` : '';
|
|
const materialNode = `<material id="${ matid }"${ materialName }><instance_effect url="#${ matid }-effect" /></material>`;
|
|
|
|
libraryMaterials.push( materialNode );
|
|
libraryEffects.push( effectnode );
|
|
materialMap.set( m, matid );
|
|
|
|
}
|
|
|
|
return matid;
|
|
|
|
}
|
|
|
|
// Recursively process the object into a scene
|
|
function processObject( o ) {
|
|
|
|
let node = `<node name="${ o.name }">`;
|
|
|
|
node += getTransform( o );
|
|
|
|
if ( o.isMesh === true && o.geometry !== null ) {
|
|
|
|
// function returns the id associated with the mesh and a "BufferGeometry" version
|
|
// of the geometry in case it's not a geometry.
|
|
const geomInfo = processGeometry( o.geometry );
|
|
const meshid = geomInfo.meshid;
|
|
const geometry = geomInfo.bufferGeometry;
|
|
|
|
// ids of the materials to bind to the geometry
|
|
let matids = null;
|
|
let matidsArray;
|
|
|
|
// get a list of materials to bind to the sub groups of the geometry.
|
|
// If the amount of subgroups is greater than the materials, than reuse
|
|
// the materials.
|
|
const mat = o.material || new MeshBasicMaterial();
|
|
const materials = Array.isArray( mat ) ? mat : [ mat ];
|
|
|
|
if ( geometry.groups.length > materials.length ) {
|
|
|
|
matidsArray = new Array( geometry.groups.length );
|
|
|
|
} else {
|
|
|
|
matidsArray = new Array( materials.length );
|
|
|
|
}
|
|
|
|
matids = matidsArray.fill().map( ( v, i ) => processMaterial( materials[ i % materials.length ] ) );
|
|
|
|
node +=
|
|
`<instance_geometry url="#${ 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>';
|
|
|
|
}
|
|
|
|
o.children.forEach( c => node += processObject( c ) );
|
|
|
|
node += '</node>';
|
|
|
|
return node;
|
|
|
|
}
|
|
|
|
const geometryInfo = new WeakMap();
|
|
const materialMap = new WeakMap();
|
|
const imageMap = new WeakMap();
|
|
const textures = [];
|
|
|
|
const libraryImages = [];
|
|
const libraryGeometries = [];
|
|
const libraryEffects = [];
|
|
const libraryMaterials = [];
|
|
const libraryVisualScenes = processObject( object );
|
|
|
|
const specLink = version === '1.4.1' ? 'http://www.collada.org/2005/11/COLLADASchema' : 'https://www.khronos.org/collada/';
|
|
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>';
|
|
|
|
dae += `<library_images>${ libraryImages.join( '' ) }</library_images>`;
|
|
|
|
dae += `<library_effects>${ libraryEffects.join( '' ) }</library_effects>`;
|
|
|
|
dae += `<library_materials>${ libraryMaterials.join( '' ) }</library_materials>`;
|
|
|
|
dae += `<library_geometries>${ libraryGeometries.join( '' ) }</library_geometries>`;
|
|
|
|
dae += `<library_visual_scenes><visual_scene id="Scene" name="scene">${ libraryVisualScenes }</visual_scene></library_visual_scenes>`;
|
|
|
|
dae += '<scene><instance_visual_scene url="#Scene"/></scene>';
|
|
|
|
dae += '</COLLADA>';
|
|
|
|
const res = {
|
|
data: format( dae ),
|
|
textures
|
|
};
|
|
|
|
if ( typeof onDone === 'function' ) {
|
|
|
|
requestAnimationFrame( () => onDone( res ) );
|
|
|
|
}
|
|
|
|
return res;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
export { ColladaExporter };
|
|
|