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/**
* @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 );
*/
module.exports = function (THREE) {
var STLLoader = function ( manager ) {
this.manager = ( manager !== undefined ) ? manager : THREE.DefaultLoadingManager;
};
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;
}
// An ASCII STL data must begin with 'solid ' as the first six bytes.
// However, ASCII STLs lacking the SPACE after the 'd' are known to be
// plentiful. So, check the first 5 bytes for 'solid'.
// US-ASCII ordinal values for 's', 'o', 'l', 'i', 'd'
var solid = [ 115, 111, 108, 105, 100 ];
for ( var i = 0; i < 5; i ++ ) {
// If solid[ i ] does not match the i-th byte, then it is not an
// ASCII STL; hence, it is binary and return true.
if ( solid[ i ] != reader.getUint8( i, false ) ) return true;
}
// First 5 bytes read "solid"; declare it to be an ASCII STL
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;
}
}
}
return STLLoader
}
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