https://github.com/mrdoob/three.js/blob/master/examples/js/loaders/STLLoader.js
Код: Выделить всё
/**
* @author aleeper / http://adamleeper.com/
* @author mrdoob / http://mrdoob.com/
* @author gero3 / https://github.com/gero3
*
* 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.
*
* 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. Seems to work for the examples...
*
* 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.XHRLoader( scope.manager );
loader.setCrossOrigin( this.crossOrigin );
loader.setResponseType( 'arraybuffer' );
loader.load( url, function ( text ) {
onLoad( scope.parse( text ) );
}, onProgress, onError );
},
setCrossOrigin: function ( value ) {
this.crossOrigin = value;
},
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 = new Float32Array( faces * 3 * 3 );
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 offset = 0;
var geometry = new THREE.BufferGeometry();
var vertices = new Float32Array( faces * 3 * 3 );
var normals = new Float32Array( faces * 3 * 3 );
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[ offset ] = reader.getFloat32( vertexstart, true );
vertices[ offset + 1 ] = reader.getFloat32( vertexstart + 4, true );
vertices[ offset + 2 ] = reader.getFloat32( vertexstart + 8, true );
normals[ offset ] = normalX;
normals[ offset + 1 ] = normalY;
normals[ offset + 2 ] = normalZ;
if ( hasColors ) {
colors[ offset ] = r;
colors[ offset + 1 ] = g;
colors[ offset + 2 ] = b;
}
offset += 3;
}
}
geometry.addAttribute( 'position', new THREE.BufferAttribute( vertices, 3 ) );
geometry.addAttribute( 'normal', new THREE.BufferAttribute( normals, 3 ) );
if ( hasColors ) {
geometry.addAttribute( 'color', new THREE.BufferAttribute( colors, 3 ) );
geometry.hasColors = true;
geometry.alpha = alpha;
}
return geometry;
},
parseASCII: function ( data ) {
var geometry, length, normal, patternFace, patternNormal, patternVertex, result, text;
geometry = new THREE.Geometry();
patternFace = /facet([\s\S]*?)endfacet/g;
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 = new THREE.Vector3( parseFloat( result[ 1 ] ), parseFloat( result[ 3 ] ), 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 ) {
geometry.vertices.push( new THREE.Vector3( parseFloat( result[ 1 ] ), parseFloat( result[ 3 ] ), parseFloat( result[ 5 ] ) ) );
}
length = geometry.vertices.length;
geometry.faces.push( new THREE.Face3( length - 3, length - 2, length - 1, normal ) );
}
geometry.computeBoundingBox();
geometry.computeBoundingSphere();
return geometry;
},
ensureString: function ( buf ) {
if ( typeof buf !== "string" ) {
var array_buffer = new Uint8Array( buf );
var str = '';
for ( var i = 0; i < buf.byteLength; i ++ ) {
str += String.fromCharCode( array_buffer[ i ] ); // implicitly assumes little-endian
}
return str;
} 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;
}
}
};
if ( typeof DataView === 'undefined' ) {
DataView = function( buffer, byteOffset, byteLength ) {
this.buffer = buffer;
this.byteOffset = byteOffset || 0;
this.byteLength = byteLength || buffer.byteLength || buffer.length;
this._isString = typeof buffer === "string";
};
DataView.prototype = {
_getCharCodes: function( buffer, start, length ) {
start = start || 0;
length = length || buffer.length;
var end = start + length;
var codes = [];
for ( var i = start; i < end; i ++ ) {
codes.push( buffer.charCodeAt( i ) & 0xff );
}
return codes;
},
_getBytes: function ( length, byteOffset, littleEndian ) {
var result;
// Handle the lack of endianness
if ( littleEndian === undefined ) {
littleEndian = this._littleEndian;
}
// Handle the lack of byteOffset
if ( byteOffset === undefined ) {
byteOffset = this.byteOffset;
} else {
byteOffset = this.byteOffset + byteOffset;
}
if ( length === undefined ) {
length = this.byteLength - byteOffset;
}
// Error Checking
if ( typeof byteOffset !== 'number' ) {
throw new TypeError( 'DataView byteOffset is not a number' );
}
if ( length < 0 || byteOffset + length > this.byteLength ) {
throw new Error( 'DataView length or (byteOffset+length) value is out of bounds' );
}
if ( this.isString ) {
result = this._getCharCodes( this.buffer, byteOffset, byteOffset + length );
} else {
result = this.buffer.slice( byteOffset, byteOffset + length );
}
if ( ! littleEndian && length > 1 ) {
if ( Array.isArray( result ) === false ) {
result = Array.prototype.slice.call( result );
}
result.reverse();
}
return result;
},
// Compatibility functions on a String Buffer
getFloat64: function ( byteOffset, littleEndian ) {
var b = this._getBytes( 8, byteOffset, littleEndian ),
sign = 1 - ( 2 * ( b[ 7 ] >> 7 ) ),
exponent = ( ( ( ( b[ 7 ] << 1 ) & 0xff ) << 3 ) | ( b[ 6 ] >> 4 ) ) - ( ( 1 << 10 ) - 1 ),
// Binary operators such as | and << operate on 32 bit values, using + and Math.pow(2) instead
mantissa = ( ( b[ 6 ] & 0x0f ) * Math.pow( 2, 48 ) ) + ( b[ 5 ] * Math.pow( 2, 40 ) ) + ( b[ 4 ] * Math.pow( 2, 32 ) ) +
( b[ 3 ] * Math.pow( 2, 24 ) ) + ( b[ 2 ] * Math.pow( 2, 16 ) ) + ( b[ 1 ] * Math.pow( 2, 8 ) ) + b[ 0 ];
if ( exponent === 1024 ) {
if ( mantissa !== 0 ) {
return NaN;
} else {
return sign * Infinity;
}
}
if ( exponent === - 1023 ) {
// Denormalized
return sign * mantissa * Math.pow( 2, - 1022 - 52 );
}
return sign * ( 1 + mantissa * Math.pow( 2, - 52 ) ) * Math.pow( 2, exponent );
},
getFloat32: function ( byteOffset, littleEndian ) {
var b = this._getBytes( 4, byteOffset, littleEndian ),
sign = 1 - ( 2 * ( b[ 3 ] >> 7 ) ),
exponent = ( ( ( b[ 3 ] << 1 ) & 0xff ) | ( b[ 2 ] >> 7 ) ) - 127,
mantissa = ( ( b[ 2 ] & 0x7f ) << 16 ) | ( b[ 1 ] << 8 ) | b[ 0 ];
if ( exponent === 128 ) {
if ( mantissa !== 0 ) {
return NaN;
} else {
return sign * Infinity;
}
}
if ( exponent === - 127 ) {
// Denormalized
return sign * mantissa * Math.pow( 2, - 126 - 23 );
}
return sign * ( 1 + mantissa * Math.pow( 2, - 23 ) ) * Math.pow( 2, exponent );
},
getInt32: function ( byteOffset, littleEndian ) {
var b = this._getBytes( 4, byteOffset, littleEndian );
return ( b[ 3 ] << 24 ) | ( b[ 2 ] << 16 ) | ( b[ 1 ] << 8 ) | b[ 0 ];
},
getUint32: function ( byteOffset, littleEndian ) {
return this.getInt32( byteOffset, littleEndian ) >>> 0;
},
getInt16: function ( byteOffset, littleEndian ) {
return ( this.getUint16( byteOffset, littleEndian ) << 16 ) >> 16;
},
getUint16: function ( byteOffset, littleEndian ) {
var b = this._getBytes( 2, byteOffset, littleEndian );
return ( b[ 1 ] << 8 ) | b[ 0 ];
},
getInt8: function ( byteOffset ) {
return ( this.getUint8( byteOffset ) << 24 ) >> 24;
},
getUint8: function ( byteOffset ) {
return this._getBytes( 1, byteOffset )[ 0 ];
}
};
}
