mirror of
https://github.com/Doodle3D/Doodle3D-Slicer.git
synced 2024-06-28 23:51:22 +02:00
434 lines
11 KiB
JavaScript
434 lines
11 KiB
JavaScript
/**
|
|
* @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 );
|
|
|
|
},
|
|
|
|
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 (!(result instanceof Array)) {
|
|
|
|
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];
|
|
}
|
|
|
|
};
|
|
|
|
}
|