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{\n\tBufferAttribute,\n\tBufferGeometry,\n\tColor,\n\tFileLoader,\n\tFloat32BufferAttribute,\n\tLoader,\n\tVector3\n} from 'three';\n\n/**\n * Description: A THREE loader for STL ASCII files, as created by Solidworks and other CAD programs.\n *\n * Supports both binary and ASCII encoded files, with automatic detection of type.\n *\n * The loader returns a non-indexed buffer geometry.\n *\n * Limitations:\n *  Binary decoding supports \"Magics\" color format (http://en.wikipedia.org/wiki/STL_(file_format)#Color_in_binary_STL).\n *  There is perhaps some question as to how valid it is to always assume little-endian-ness.\n *  ASCII decoding assumes file is UTF-8.\n *\n * Usage:\n *  const loader = new STLLoader();\n *  loader.load( './models/stl/slotted_disk.stl', function ( geometry ) {\n *    scene.add( new THREE.Mesh( geometry ) );\n *  });\n *\n * For binary STLs geometry might contain colors for vertices. To use it:\n *  // use the same code to load STL as above\n *  if (geometry.hasColors) {\n *    material = new THREE.MeshPhongMaterial({ opacity: geometry.alpha, vertexColors: true });\n *  } else { .... }\n *  const mesh = new THREE.Mesh( geometry, material );\n *\n * For ASCII STLs containing multiple solids, each solid is assigned to a different group.\n * Groups can be used to assign a different color by defining an array of materials with the same length of\n * geometry.groups and passing it to the Mesh constructor:\n *\n * const mesh = new THREE.Mesh( geometry, material );\n *\n * For example:\n *\n *  const materials = [];\n *  const nGeometryGroups = geometry.groups.length;\n *\n *  const colorMap = ...; // Some logic to index colors.\n *\n *  for (let i = 0; i \u003c nGeometryGroups; i++) {\n *\n *\t\tconst material = new THREE.MeshPhongMaterial({\n *\t\t\tcolor: colorMap[i],\n *\t\t\twireframe: false\n *\t\t});\n *\n *  }\n *\n *  materials.push(material);\n *  const mesh = new THREE.Mesh(geometry, materials);\n */\n\n\nclass STLLoader extends Loader {\n\n\tconstructor( manager ) {\n\n\t\tsuper( manager );\n\n\t}\n\n\tload( url, onLoad, onProgress, onError ) {\n\n\t\tconst scope = this;\n\n\t\tconst loader = new FileLoader( this.manager );\n\t\tloader.setPath( this.path );\n\t\tloader.setResponseType( 'arraybuffer' );\n\t\tloader.setRequestHeader( this.requestHeader );\n\t\tloader.setWithCredentials( this.withCredentials );\n\n\t\tloader.load( url, function ( text ) {\n\n\t\t\ttry {\n\n\t\t\t\tonLoad( scope.parse( text ) );\n\n\t\t\t} catch ( e ) {\n\n\t\t\t\tif ( onError ) {\n\n\t\t\t\t\tonError( e );\n\n\t\t\t\t} else {\n\n\t\t\t\t\tconsole.error( e );\n\n\t\t\t\t}\n\n\t\t\t\tscope.manager.itemError( url );\n\n\t\t\t}\n\n\t\t}, onProgress, onError );\n\n\t}\n\n\tparse( data ) {\n\n\t\tfunction isBinary( data ) {\n\n\t\t\tconst reader = new DataView( data );\n\t\t\tconst face_size = ( 32 / 8 * 3 ) + ( ( 32 / 8 * 3 ) * 3 ) + ( 16 / 8 );\n\t\t\tconst n_faces = reader.getUint32( 80, true );\n\t\t\tconst expect = 80 + ( 32 / 8 ) + ( n_faces * face_size );\n\n\t\t\tif ( expect === reader.byteLength ) {\n\n\t\t\t\treturn true;\n\n\t\t\t}\n\n\t\t\t// An ASCII STL data must begin with 'solid ' as the first six bytes.\n\t\t\t// However, ASCII STLs lacking the SPACE after the 'd' are known to be\n\t\t\t// plentiful.  So, check the first 5 bytes for 'solid'.\n\n\t\t\t// Several encodings, such as UTF-8, precede the text with up to 5 bytes:\n\t\t\t// https://en.wikipedia.org/wiki/Byte_order_mark#Byte_order_marks_by_encoding\n\t\t\t// Search for \"solid\" to start anywhere after those prefixes.\n\n\t\t\t// US-ASCII ordinal values for 's', 'o', 'l', 'i', 'd'\n\n\t\t\tconst solid = [ 115, 111, 108, 105, 100 ];\n\n\t\t\tfor ( let off = 0; off \u003c 5; off ++ ) {\n\n\t\t\t\t// If \"solid\" text is matched to the current offset, declare it to be an ASCII STL.\n\n\t\t\t\tif ( matchDataViewAt( solid, reader, off ) ) return false;\n\n\t\t\t}\n\n\t\t\t// Couldn't find \"solid\" text at the beginning; it is binary STL.\n\n\t\t\treturn true;\n\n\t\t}\n\n\t\tfunction matchDataViewAt( query, reader, offset ) {\n\n\t\t\t// Check if each byte in query matches the corresponding byte from the current offset\n\n\t\t\tfor ( let i = 0, il = query.length; i \u003c il; i ++ ) {\n\n\t\t\t\tif ( query[ i ] !== reader.getUint8( offset + i ) ) return false;\n\n\t\t\t}\n\n\t\t\treturn true;\n\n\t\t}\n\n\t\tfunction parseBinary( data ) {\n\n\t\t\tconst reader = new DataView( data );\n\t\t\tconst faces = reader.getUint32( 80, true );\n\n\t\t\tlet r, g, b, hasColors = false, colors;\n\t\t\tlet defaultR, defaultG, defaultB, alpha;\n\n\t\t\t// process STL header\n\t\t\t// check for default color in header (\"COLOR=rgba\" sequence).\n\n\t\t\tfor ( let index = 0; index \u003c 80 - 10; index ++ ) {\n\n\t\t\t\tif ( ( reader.getUint32( index, false ) == 0x434F4C4F /*COLO*/ ) \u0026\u0026\n\t\t\t\t\t( reader.getUint8( index + 4 ) == 0x52 /*'R'*/ ) \u0026\u0026\n\t\t\t\t\t( reader.getUint8( index + 5 ) == 0x3D /*'='*/ ) ) {\n\n\t\t\t\t\thasColors = true;\n\t\t\t\t\tcolors = new Float32Array( faces * 3 * 3 );\n\n\t\t\t\t\tdefaultR = reader.getUint8( index + 6 ) / 255;\n\t\t\t\t\tdefaultG = reader.getUint8( index + 7 ) / 255;\n\t\t\t\t\tdefaultB = reader.getUint8( index + 8 ) / 255;\n\t\t\t\t\talpha = reader.getUint8( index + 9 ) / 255;\n\n\t\t\t\t}\n\n\t\t\t}\n\n\t\t\tconst dataOffset = 84;\n\t\t\tconst faceLength = 12 * 4 + 2;\n\n\t\t\tconst geometry = new BufferGeometry();\n\n\t\t\tconst vertices = new Float32Array( faces * 3 * 3 );\n\t\t\tconst normals = new Float32Array( faces * 3 * 3 );\n\n\t\t\tconst color = new Color();\n\n\t\t\tfor ( let face = 0; face \u003c faces; face ++ ) {\n\n\t\t\t\tconst start = dataOffset + face * faceLength;\n\t\t\t\tconst normalX = reader.getFloat32( start, true );\n\t\t\t\tconst normalY = reader.getFloat32( start + 4, true );\n\t\t\t\tconst normalZ = reader.getFloat32( start + 8, true );\n\n\t\t\t\tif ( hasColors ) {\n\n\t\t\t\t\tconst packedColor = reader.getUint16( start + 48, true );\n\n\t\t\t\t\tif ( ( packedColor \u0026 0x8000 ) === 0 ) {\n\n\t\t\t\t\t\t// facet has its own unique color\n\n\t\t\t\t\t\tr = ( packedColor \u0026 0x1F ) / 31;\n\t\t\t\t\t\tg = ( ( packedColor \u003e\u003e 5 ) \u0026 0x1F ) / 31;\n\t\t\t\t\t\tb = ( ( packedColor \u003e\u003e 10 ) \u0026 0x1F ) / 31;\n\n\t\t\t\t\t} else {\n\n\t\t\t\t\t\tr = defaultR;\n\t\t\t\t\t\tg = defaultG;\n\t\t\t\t\t\tb = defaultB;\n\n\t\t\t\t\t}\n\n\t\t\t\t}\n\n\t\t\t\tfor ( let i = 1; i \u003c= 3; i ++ ) {\n\n\t\t\t\t\tconst vertexstart = start + i * 12;\n\t\t\t\t\tconst componentIdx = ( face * 3 * 3 ) + ( ( i - 1 ) * 3 );\n\n\t\t\t\t\tvertices[ componentIdx ] = reader.getFloat32( vertexstart, true );\n\t\t\t\t\tvertices[ componentIdx + 1 ] = reader.getFloat32( vertexstart + 4, true );\n\t\t\t\t\tvertices[ componentIdx + 2 ] = reader.getFloat32( vertexstart + 8, true );\n\n\t\t\t\t\tnormals[ componentIdx ] = normalX;\n\t\t\t\t\tnormals[ componentIdx + 1 ] = normalY;\n\t\t\t\t\tnormals[ componentIdx + 2 ] = normalZ;\n\n\t\t\t\t\tif ( hasColors ) {\n\n\t\t\t\t\t\tcolor.set( r, g, b ).convertSRGBToLinear();\n\n\t\t\t\t\t\tcolors[ componentIdx ] = color.r;\n\t\t\t\t\t\tcolors[ componentIdx + 1 ] = color.g;\n\t\t\t\t\t\tcolors[ componentIdx + 2 ] = color.b;\n\n\t\t\t\t\t}\n\n\t\t\t\t}\n\n\t\t\t}\n\n\t\t\tgeometry.setAttribute( 'position', new BufferAttribute( vertices, 3 ) );\n\t\t\tgeometry.setAttribute( 'normal', new BufferAttribute( normals, 3 ) );\n\n\t\t\tif ( hasColors ) {\n\n\t\t\t\tgeometry.setAttribute( 'color', new BufferAttribute( colors, 3 ) );\n\t\t\t\tgeometry.hasColors = true;\n\t\t\t\tgeometry.alpha = alpha;\n\n\t\t\t}\n\n\t\t\treturn geometry;\n\n\t\t}\n\n\t\tfunction parseASCII( data ) {\n\n\t\t\tconst geometry = new BufferGeometry();\n\t\t\tconst patternSolid = /solid([\\s\\S]*?)endsolid/g;\n\t\t\tconst patternFace = /facet([\\s\\S]*?)endfacet/g;\n\t\t\tconst patternName = /solid\\s(.+)/;\n\t\t\tlet faceCounter = 0;\n\n\t\t\tconst patternFloat = /[\\s]+([+-]?(?:\\d*)(?:\\.\\d*)?(?:[eE][+-]?\\d+)?)/.source;\n\t\t\tconst patternVertex = new RegExp( 'vertex' + patternFloat + patternFloat + patternFloat, 'g' );\n\t\t\tconst patternNormal = new RegExp( 'normal' + patternFloat + patternFloat + patternFloat, 'g' );\n\n\t\t\tconst vertices = [];\n\t\t\tconst normals = [];\n\t\t\tconst groupNames = [];\n\n\t\t\tconst normal = new Vector3();\n\n\t\t\tlet result;\n\n\t\t\tlet groupCount = 0;\n\t\t\tlet startVertex = 0;\n\t\t\tlet endVertex = 0;\n\n\t\t\twhile ( ( result = patternSolid.exec( data ) ) !== null ) {\n\n\t\t\t\tstartVertex = endVertex;\n\n\t\t\t\tconst solid = result[ 0 ];\n\n\t\t\t\tconst name = ( result = patternName.exec( solid ) ) !== null ? result[ 1 ] : '';\n\t\t\t\tgroupNames.push( name );\n\n\t\t\t\twhile ( ( result = patternFace.exec( solid ) ) !== null ) {\n\n\t\t\t\t\tlet vertexCountPerFace = 0;\n\t\t\t\t\tlet normalCountPerFace = 0;\n\n\t\t\t\t\tconst text = result[ 0 ];\n\n\t\t\t\t\twhile ( ( result = patternNormal.exec( text ) ) !== null ) {\n\n\t\t\t\t\t\tnormal.x = parseFloat( result[ 1 ] );\n\t\t\t\t\t\tnormal.y = parseFloat( result[ 2 ] );\n\t\t\t\t\t\tnormal.z = parseFloat( result[ 3 ] );\n\t\t\t\t\t\tnormalCountPerFace ++;\n\n\t\t\t\t\t}\n\n\t\t\t\t\twhile ( ( result = patternVertex.exec( text ) ) !== null ) {\n\n\t\t\t\t\t\tvertices.push( parseFloat( result[ 1 ] ), parseFloat( result[ 2 ] ), parseFloat( result[ 3 ] ) );\n\t\t\t\t\t\tnormals.push( normal.x, normal.y, normal.z );\n\t\t\t\t\t\tvertexCountPerFace ++;\n\t\t\t\t\t\tendVertex ++;\n\n\t\t\t\t\t}\n\n\t\t\t\t\t// every face have to own ONE valid normal\n\n\t\t\t\t\tif ( normalCountPerFace !== 1 ) {\n\n\t\t\t\t\t\tconsole.error( 'THREE.STLLoader: Something isn\\'t right with the normal of face number ' + faceCounter );\n\n\t\t\t\t\t}\n\n\t\t\t\t\t// each face have to own THREE valid vertices\n\n\t\t\t\t\tif ( vertexCountPerFace !== 3 ) {\n\n\t\t\t\t\t\tconsole.error( 'THREE.STLLoader: Something isn\\'t right with the vertices of face number ' + faceCounter );\n\n\t\t\t\t\t}\n\n\t\t\t\t\tfaceCounter ++;\n\n\t\t\t\t}\n\n\t\t\t\tconst start = startVertex;\n\t\t\t\tconst count = endVertex - startVertex;\n\n\t\t\t\tgeometry.userData.groupNames = groupNames;\n\n\t\t\t\tgeometry.addGroup( start, count, groupCount );\n\t\t\t\tgroupCount ++;\n\n\t\t\t}\n\n\t\t\tgeometry.setAttribute( 'position', new Float32BufferAttribute( vertices, 3 ) );\n\t\t\tgeometry.setAttribute( 'normal', new Float32BufferAttribute( normals, 3 ) );\n\n\t\t\treturn geometry;\n\n\t\t}\n\n\t\tfunction ensureString( buffer ) {\n\n\t\t\tif ( typeof buffer !== 'string' ) {\n\n\t\t\t\treturn new TextDecoder().decode( buffer );\n\n\t\t\t}\n\n\t\t\treturn buffer;\n\n\t\t}\n\n\t\tfunction ensureBinary( buffer ) {\n\n\t\t\tif ( typeof buffer === 'string' ) {\n\n\t\t\t\tconst array_buffer = new Uint8Array( buffer.length );\n\t\t\t\tfor ( let i = 0; i \u003c buffer.length; i ++ ) {\n\n\t\t\t\t\tarray_buffer[ i ] = buffer.charCodeAt( i ) \u0026 0xff; // implicitly assumes little-endian\n\n\t\t\t\t}\n\n\t\t\t\treturn array_buffer.buffer || array_buffer;\n\n\t\t\t} else {\n\n\t\t\t\treturn buffer;\n\n\t\t\t}\n\n\t\t}\n\n\t\t// start\n\n\t\tconst binData = ensureBinary( data );\n\n\t\treturn isBinary( binData ) ? parseBinary( binData ) : parseASCII( ensureString( data ) );\n\n\t}\n\n}\n\nexport { STLLoader };\n"],"version":3}