Thu, 06 Apr 2017 17:18:24 +0200
finishing first release
/** * @author aleeper / http://adamleeper.com/ * @author mrdoob / http://mrdoob.com/ * @author gero3 / https://github.com/gero3 * @author Mugen87 / https://github.com/Mugen87 * * Description: A THREE loader for STL ASCII files, as created by Solidworks and other CAD programs. * * Supports both binary and ASCII encoded files, with automatic detection of type. * * The loader returns a non-indexed buffer geometry. * * Limitations: * Binary decoding supports "Magics" color format (http://en.wikipedia.org/wiki/STL_(file_format)#Color_in_binary_STL). * There is perhaps some question as to how valid it is to always assume little-endian-ness. * ASCII decoding assumes file is UTF-8. * * Usage: * var loader = new THREE.STLLoader(); * loader.load( './models/stl/slotted_disk.stl', function ( geometry ) { * scene.add( new THREE.Mesh( geometry ) ); * }); * * For binary STLs geometry might contain colors for vertices. To use it: * // use the same code to load STL as above * if (geometry.hasColors) { * material = new THREE.MeshPhongMaterial({ opacity: geometry.alpha, vertexColors: THREE.VertexColors }); * } else { .... } * var mesh = new THREE.Mesh( geometry, material ); */ THREE.STLLoader = function ( manager ) { this.manager = ( manager !== undefined ) ? manager : THREE.DefaultLoadingManager; }; THREE.STLLoader.prototype = { constructor: THREE.STLLoader, load: function ( url, onLoad, onProgress, onError ) { var scope = this; var loader = new THREE.FileLoader( scope.manager ); loader.setResponseType( 'arraybuffer' ); loader.load( url, function ( text ) { onLoad( scope.parse( text ) ); }, onProgress, onError ); }, parse: function ( data ) { var isBinary = function () { var expect, face_size, n_faces, reader; reader = new DataView( binData ); face_size = ( 32 / 8 * 3 ) + ( ( 32 / 8 * 3 ) * 3 ) + ( 16 / 8 ); n_faces = reader.getUint32( 80, true ); expect = 80 + ( 32 / 8 ) + ( n_faces * face_size ); if ( expect === reader.byteLength ) { return true; } // some binary files will have different size from expected, // checking characters higher than ASCII to confirm is binary var fileLength = reader.byteLength; for ( var index = 0; index < fileLength; index ++ ) { if ( reader.getUint8( index, false ) > 127 ) { return true; } } return false; }; var binData = this.ensureBinary( data ); return isBinary() ? this.parseBinary( binData ) : this.parseASCII( this.ensureString( data ) ); }, parseBinary: function ( data ) { var reader = new DataView( data ); var faces = reader.getUint32( 80, true ); var r, g, b, hasColors = false, colors; var defaultR, defaultG, defaultB, alpha; // process STL header // check for default color in header ("COLOR=rgba" sequence). for ( var index = 0; index < 80 - 10; index ++ ) { if ( ( reader.getUint32( index, false ) == 0x434F4C4F /*COLO*/ ) && ( reader.getUint8( index + 4 ) == 0x52 /*'R'*/ ) && ( reader.getUint8( index + 5 ) == 0x3D /*'='*/ ) ) { hasColors = true; colors = []; defaultR = reader.getUint8( index + 6 ) / 255; defaultG = reader.getUint8( index + 7 ) / 255; defaultB = reader.getUint8( index + 8 ) / 255; alpha = reader.getUint8( index + 9 ) / 255; } } var dataOffset = 84; var faceLength = 12 * 4 + 2; var geometry = new THREE.BufferGeometry(); var vertices = []; var normals = []; for ( var face = 0; face < faces; face ++ ) { var start = dataOffset + face * faceLength; var normalX = reader.getFloat32( start, true ); var normalY = reader.getFloat32( start + 4, true ); var normalZ = reader.getFloat32( start + 8, true ); if ( hasColors ) { var packedColor = reader.getUint16( start + 48, true ); if ( ( packedColor & 0x8000 ) === 0 ) { // facet has its own unique color r = ( packedColor & 0x1F ) / 31; g = ( ( packedColor >> 5 ) & 0x1F ) / 31; b = ( ( packedColor >> 10 ) & 0x1F ) / 31; } else { r = defaultR; g = defaultG; b = defaultB; } } for ( var i = 1; i <= 3; i ++ ) { var vertexstart = start + i * 12; vertices.push( reader.getFloat32( vertexstart, true ) ); vertices.push( reader.getFloat32( vertexstart + 4, true ) ); vertices.push( reader.getFloat32( vertexstart + 8, true ) ); normals.push( normalX, normalY, normalZ ); if ( hasColors ) { colors.push( r, g, b ); } } } geometry.addAttribute( 'position', new THREE.BufferAttribute( new Float32Array( vertices ), 3 ) ); geometry.addAttribute( 'normal', new THREE.BufferAttribute( new Float32Array( normals ), 3 ) ); if ( hasColors ) { geometry.addAttribute( 'color', new THREE.BufferAttribute( new Float32Array( colors ), 3 ) ); geometry.hasColors = true; geometry.alpha = alpha; } return geometry; }, parseASCII: function ( data ) { var geometry, length, patternFace, patternNormal, patternVertex, result, text; geometry = new THREE.BufferGeometry(); patternFace = /facet([\s\S]*?)endfacet/g; var vertices = []; var normals = []; var normal = new THREE.Vector3(); while ( ( result = patternFace.exec( data ) ) !== null ) { text = result[ 0 ]; patternNormal = /normal[\s]+([\-+]?[0-9]+\.?[0-9]*([eE][\-+]?[0-9]+)?)+[\s]+([\-+]?[0-9]*\.?[0-9]+([eE][\-+]?[0-9]+)?)+[\s]+([\-+]?[0-9]*\.?[0-9]+([eE][\-+]?[0-9]+)?)+/g; while ( ( result = patternNormal.exec( text ) ) !== null ) { normal.x = parseFloat( result[ 1 ] ); normal.y = parseFloat( result[ 3 ] ); normal.z = parseFloat( result[ 5 ] ); } patternVertex = /vertex[\s]+([\-+]?[0-9]+\.?[0-9]*([eE][\-+]?[0-9]+)?)+[\s]+([\-+]?[0-9]*\.?[0-9]+([eE][\-+]?[0-9]+)?)+[\s]+([\-+]?[0-9]*\.?[0-9]+([eE][\-+]?[0-9]+)?)+/g; while ( ( result = patternVertex.exec( text ) ) !== null ) { vertices.push( parseFloat( result[ 1 ] ), parseFloat( result[ 3 ] ), parseFloat( result[ 5 ] ) ); normals.push( normal.x, normal.y, normal.z ); } } geometry.addAttribute( 'position', new THREE.BufferAttribute( new Float32Array( vertices ), 3 ) ); geometry.addAttribute( 'normal', new THREE.BufferAttribute( new Float32Array( normals ), 3 ) ); return geometry; }, ensureString: function ( buf ) { if ( typeof buf !== "string" ) { var array_buffer = new Uint8Array( buf ); var strArray = []; for ( var i = 0; i < buf.byteLength; i ++ ) { strArray.push(String.fromCharCode( array_buffer[ i ] )); // implicitly assumes little-endian } return strArray.join(''); } else { return buf; } }, ensureBinary: function ( buf ) { if ( typeof buf === "string" ) { var array_buffer = new Uint8Array( buf.length ); for ( var i = 0; i < buf.length; i ++ ) { array_buffer[ i ] = buf.charCodeAt( i ) & 0xff; // implicitly assumes little-endian } return array_buffer.buffer || array_buffer; } else { return buf; } } };