mirror of
https://github.com/Doodle3D/Doodle3D-Slicer.git
synced 2024-11-26 23:44:56 +01:00
662 lines
17 KiB
JavaScript
Executable File
662 lines
17 KiB
JavaScript
Executable File
/*
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Copyright (c) 2011 Juan Mellado
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Permission is hereby granted, free of charge, to any person obtaining a copy
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of this software and associated documentation files (the "Software"), to deal
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in the Software without restriction, including without limitation the rights
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to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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copies of the Software, and to permit persons to whom the Software is
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furnished to do so, subject to the following conditions:
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The above copyright notice and this permission notice shall be included in
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all copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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THE SOFTWARE.
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*/
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/*
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References:
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- "OpenCTM: The Open Compressed Triangle Mesh file format" by Marcus Geelnard
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http://openctm.sourceforge.net/
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*/
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var CTM = CTM || {};
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// browserify support
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if ( typeof module === 'object' ) {
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module.exports = CTM;
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}
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CTM.CompressionMethod = {
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RAW: 0x00574152,
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MG1: 0x0031474d,
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MG2: 0x0032474d
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};
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CTM.Flags = {
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NORMALS: 0x00000001
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};
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CTM.File = function(stream) {
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this.load(stream);
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};
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CTM.File.prototype.load = function(stream) {
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this.header = new CTM.FileHeader(stream);
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this.body = new CTM.FileBody(this.header);
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this.getReader().read(stream, this.body);
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};
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CTM.File.prototype.getReader = function() {
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var reader;
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switch (this.header.compressionMethod){
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case CTM.CompressionMethod.RAW:
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reader = new CTM.ReaderRAW();
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break;
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case CTM.CompressionMethod.MG1:
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reader = new CTM.ReaderMG1();
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break;
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case CTM.CompressionMethod.MG2:
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reader = new CTM.ReaderMG2();
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break;
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}
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return reader;
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};
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CTM.FileHeader = function(stream) {
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stream.readInt32(); //magic "OCTM"
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this.fileFormat = stream.readInt32();
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this.compressionMethod = stream.readInt32();
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this.vertexCount = stream.readInt32();
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this.triangleCount = stream.readInt32();
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this.uvMapCount = stream.readInt32();
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this.attrMapCount = stream.readInt32();
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this.flags = stream.readInt32();
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this.comment = stream.readString();
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};
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CTM.FileHeader.prototype.hasNormals = function() {
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return this.flags & CTM.Flags.NORMALS;
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};
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CTM.FileBody = function(header) {
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var i = header.triangleCount * 3,
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v = header.vertexCount * 3,
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n = header.hasNormals() ? header.vertexCount * 3 : 0,
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u = header.vertexCount * 2,
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a = header.vertexCount * 4,
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j = 0;
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var data = new ArrayBuffer(
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(i + v + n + (u * header.uvMapCount) + (a * header.attrMapCount) ) * 4);
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this.indices = new Uint32Array(data, 0, i);
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this.vertices = new Float32Array(data, i * 4, v);
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if ( header.hasNormals() ) {
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this.normals = new Float32Array(data, (i + v) * 4, n);
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}
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if (header.uvMapCount) {
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this.uvMaps = [];
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for (j = 0; j < header.uvMapCount; ++ j) {
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this.uvMaps[j] = { uv: new Float32Array(data,
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(i + v + n + (j * u) ) * 4, u) };
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}
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}
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if (header.attrMapCount) {
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this.attrMaps = [];
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for (j = 0; j < header.attrMapCount; ++ j) {
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this.attrMaps[j] = { attr: new Float32Array(data,
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(i + v + n + (u * header.uvMapCount) + (j * a) ) * 4, a) };
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}
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}
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};
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CTM.FileMG2Header = function(stream) {
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stream.readInt32(); //magic "MG2H"
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this.vertexPrecision = stream.readFloat32();
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this.normalPrecision = stream.readFloat32();
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this.lowerBoundx = stream.readFloat32();
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this.lowerBoundy = stream.readFloat32();
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this.lowerBoundz = stream.readFloat32();
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this.higherBoundx = stream.readFloat32();
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this.higherBoundy = stream.readFloat32();
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this.higherBoundz = stream.readFloat32();
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this.divx = stream.readInt32();
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this.divy = stream.readInt32();
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this.divz = stream.readInt32();
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this.sizex = (this.higherBoundx - this.lowerBoundx) / this.divx;
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this.sizey = (this.higherBoundy - this.lowerBoundy) / this.divy;
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this.sizez = (this.higherBoundz - this.lowerBoundz) / this.divz;
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};
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CTM.ReaderRAW = function() {
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};
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CTM.ReaderRAW.prototype.read = function(stream, body) {
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this.readIndices(stream, body.indices);
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this.readVertices(stream, body.vertices);
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if (body.normals) {
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this.readNormals(stream, body.normals);
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}
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if (body.uvMaps) {
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this.readUVMaps(stream, body.uvMaps);
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}
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if (body.attrMaps) {
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this.readAttrMaps(stream, body.attrMaps);
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}
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};
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CTM.ReaderRAW.prototype.readIndices = function(stream, indices) {
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stream.readInt32(); //magic "INDX"
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stream.readArrayInt32(indices);
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};
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CTM.ReaderRAW.prototype.readVertices = function(stream, vertices) {
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stream.readInt32(); //magic "VERT"
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stream.readArrayFloat32(vertices);
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};
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CTM.ReaderRAW.prototype.readNormals = function(stream, normals) {
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stream.readInt32(); //magic "NORM"
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stream.readArrayFloat32(normals);
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};
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CTM.ReaderRAW.prototype.readUVMaps = function(stream, uvMaps) {
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var i = 0;
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for (; i < uvMaps.length; ++ i) {
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stream.readInt32(); //magic "TEXC"
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uvMaps[i].name = stream.readString();
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uvMaps[i].filename = stream.readString();
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stream.readArrayFloat32(uvMaps[i].uv);
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}
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};
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CTM.ReaderRAW.prototype.readAttrMaps = function(stream, attrMaps) {
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var i = 0;
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for (; i < attrMaps.length; ++ i) {
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stream.readInt32(); //magic "ATTR"
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attrMaps[i].name = stream.readString();
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stream.readArrayFloat32(attrMaps[i].attr);
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}
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};
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CTM.ReaderMG1 = function() {
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};
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CTM.ReaderMG1.prototype.read = function(stream, body) {
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this.readIndices(stream, body.indices);
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this.readVertices(stream, body.vertices);
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if (body.normals) {
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this.readNormals(stream, body.normals);
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}
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if (body.uvMaps) {
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this.readUVMaps(stream, body.uvMaps);
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}
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if (body.attrMaps) {
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this.readAttrMaps(stream, body.attrMaps);
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}
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};
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CTM.ReaderMG1.prototype.readIndices = function(stream, indices) {
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stream.readInt32(); //magic "INDX"
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stream.readInt32(); //packed size
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var interleaved = new CTM.InterleavedStream(indices, 3);
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LZMA.decompress(stream, stream, interleaved, interleaved.data.length);
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CTM.restoreIndices(indices, indices.length);
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};
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CTM.ReaderMG1.prototype.readVertices = function(stream, vertices) {
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stream.readInt32(); //magic "VERT"
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stream.readInt32(); //packed size
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var interleaved = new CTM.InterleavedStream(vertices, 1);
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LZMA.decompress(stream, stream, interleaved, interleaved.data.length);
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};
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CTM.ReaderMG1.prototype.readNormals = function(stream, normals) {
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stream.readInt32(); //magic "NORM"
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stream.readInt32(); //packed size
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var interleaved = new CTM.InterleavedStream(normals, 3);
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LZMA.decompress(stream, stream, interleaved, interleaved.data.length);
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};
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CTM.ReaderMG1.prototype.readUVMaps = function(stream, uvMaps) {
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var i = 0;
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for (; i < uvMaps.length; ++ i) {
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stream.readInt32(); //magic "TEXC"
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uvMaps[i].name = stream.readString();
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uvMaps[i].filename = stream.readString();
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stream.readInt32(); //packed size
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var interleaved = new CTM.InterleavedStream(uvMaps[i].uv, 2);
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LZMA.decompress(stream, stream, interleaved, interleaved.data.length);
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}
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};
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CTM.ReaderMG1.prototype.readAttrMaps = function(stream, attrMaps) {
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var i = 0;
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for (; i < attrMaps.length; ++ i) {
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stream.readInt32(); //magic "ATTR"
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attrMaps[i].name = stream.readString();
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stream.readInt32(); //packed size
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var interleaved = new CTM.InterleavedStream(attrMaps[i].attr, 4);
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LZMA.decompress(stream, stream, interleaved, interleaved.data.length);
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}
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};
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CTM.ReaderMG2 = function() {
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};
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CTM.ReaderMG2.prototype.read = function(stream, body) {
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this.MG2Header = new CTM.FileMG2Header(stream);
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this.readVertices(stream, body.vertices);
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this.readIndices(stream, body.indices);
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if (body.normals) {
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this.readNormals(stream, body);
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}
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if (body.uvMaps) {
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this.readUVMaps(stream, body.uvMaps);
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}
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if (body.attrMaps) {
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this.readAttrMaps(stream, body.attrMaps);
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}
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};
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CTM.ReaderMG2.prototype.readVertices = function(stream, vertices) {
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stream.readInt32(); //magic "VERT"
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stream.readInt32(); //packed size
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var interleaved = new CTM.InterleavedStream(vertices, 3);
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LZMA.decompress(stream, stream, interleaved, interleaved.data.length);
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var gridIndices = this.readGridIndices(stream, vertices);
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CTM.restoreVertices(vertices, this.MG2Header, gridIndices, this.MG2Header.vertexPrecision);
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};
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CTM.ReaderMG2.prototype.readGridIndices = function(stream, vertices) {
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stream.readInt32(); //magic "GIDX"
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stream.readInt32(); //packed size
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var gridIndices = new Uint32Array(vertices.length / 3);
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var interleaved = new CTM.InterleavedStream(gridIndices, 1);
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LZMA.decompress(stream, stream, interleaved, interleaved.data.length);
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CTM.restoreGridIndices(gridIndices, gridIndices.length);
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return gridIndices;
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};
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CTM.ReaderMG2.prototype.readIndices = function(stream, indices) {
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stream.readInt32(); //magic "INDX"
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stream.readInt32(); //packed size
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var interleaved = new CTM.InterleavedStream(indices, 3);
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LZMA.decompress(stream, stream, interleaved, interleaved.data.length);
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CTM.restoreIndices(indices, indices.length);
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};
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CTM.ReaderMG2.prototype.readNormals = function(stream, body) {
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stream.readInt32(); //magic "NORM"
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stream.readInt32(); //packed size
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var interleaved = new CTM.InterleavedStream(body.normals, 3);
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LZMA.decompress(stream, stream, interleaved, interleaved.data.length);
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var smooth = CTM.calcSmoothNormals(body.indices, body.vertices);
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CTM.restoreNormals(body.normals, smooth, this.MG2Header.normalPrecision);
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};
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CTM.ReaderMG2.prototype.readUVMaps = function(stream, uvMaps) {
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var i = 0;
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for (; i < uvMaps.length; ++ i) {
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stream.readInt32(); //magic "TEXC"
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uvMaps[i].name = stream.readString();
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uvMaps[i].filename = stream.readString();
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var precision = stream.readFloat32();
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stream.readInt32(); //packed size
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var interleaved = new CTM.InterleavedStream(uvMaps[i].uv, 2);
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LZMA.decompress(stream, stream, interleaved, interleaved.data.length);
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CTM.restoreMap(uvMaps[i].uv, 2, precision);
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}
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};
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CTM.ReaderMG2.prototype.readAttrMaps = function(stream, attrMaps) {
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var i = 0;
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for (; i < attrMaps.length; ++ i) {
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stream.readInt32(); //magic "ATTR"
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attrMaps[i].name = stream.readString();
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var precision = stream.readFloat32();
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stream.readInt32(); //packed size
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var interleaved = new CTM.InterleavedStream(attrMaps[i].attr, 4);
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LZMA.decompress(stream, stream, interleaved, interleaved.data.length);
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CTM.restoreMap(attrMaps[i].attr, 4, precision);
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}
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};
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CTM.restoreIndices = function(indices, len) {
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var i = 3;
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if (len > 0) {
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indices[2] += indices[0];
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indices[1] += indices[0];
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}
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for (; i < len; i += 3) {
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indices[i] += indices[i - 3];
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if (indices[i] === indices[i - 3]) {
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indices[i + 1] += indices[i - 2];
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}else {
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indices[i + 1] += indices[i];
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}
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indices[i + 2] += indices[i];
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}
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};
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CTM.restoreGridIndices = function(gridIndices, len) {
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var i = 1;
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for (; i < len; ++ i) {
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gridIndices[i] += gridIndices[i - 1];
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}
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};
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CTM.restoreVertices = function(vertices, grid, gridIndices, precision) {
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var gridIdx, delta, x, y, z,
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intVertices = new Uint32Array(vertices.buffer, vertices.byteOffset, vertices.length),
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ydiv = grid.divx, zdiv = ydiv * grid.divy,
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prevGridIdx = 0x7fffffff, prevDelta = 0,
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i = 0, j = 0, len = gridIndices.length;
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for (; i < len; j += 3) {
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x = gridIdx = gridIndices[i ++];
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z = ~~(x / zdiv);
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x -= ~~(z * zdiv);
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y = ~~(x / ydiv);
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x -= ~~(y * ydiv);
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delta = intVertices[j];
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if (gridIdx === prevGridIdx) {
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delta += prevDelta;
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}
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vertices[j] = grid.lowerBoundx +
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x * grid.sizex + precision * delta;
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vertices[j + 1] = grid.lowerBoundy +
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y * grid.sizey + precision * intVertices[j + 1];
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vertices[j + 2] = grid.lowerBoundz +
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z * grid.sizez + precision * intVertices[j + 2];
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prevGridIdx = gridIdx;
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prevDelta = delta;
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}
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};
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CTM.restoreNormals = function(normals, smooth, precision) {
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var ro, phi, theta, sinPhi,
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nx, ny, nz, by, bz, len,
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intNormals = new Uint32Array(normals.buffer, normals.byteOffset, normals.length),
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i = 0, k = normals.length,
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PI_DIV_2 = 3.141592653589793238462643 * 0.5;
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for (; i < k; i += 3) {
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ro = intNormals[i] * precision;
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phi = intNormals[i + 1];
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if (phi === 0) {
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normals[i] = smooth[i] * ro;
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normals[i + 1] = smooth[i + 1] * ro;
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normals[i + 2] = smooth[i + 2] * ro;
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}else {
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if (phi <= 4) {
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theta = (intNormals[i + 2] - 2) * PI_DIV_2;
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}else {
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theta = ( (intNormals[i + 2] * 4 / phi) - 2) * PI_DIV_2;
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}
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phi *= precision * PI_DIV_2;
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sinPhi = ro * Math.sin(phi);
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nx = sinPhi * Math.cos(theta);
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ny = sinPhi * Math.sin(theta);
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nz = ro * Math.cos(phi);
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bz = smooth[i + 1];
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by = smooth[i] - smooth[i + 2];
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len = Math.sqrt(2 * bz * bz + by * by);
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if (len > 1e-20) {
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by /= len;
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bz /= len;
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}
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normals[i] = smooth[i] * nz +
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(smooth[i + 1] * bz - smooth[i + 2] * by) * ny - bz * nx;
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normals[i + 1] = smooth[i + 1] * nz -
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(smooth[i + 2] + smooth[i] ) * bz * ny + by * nx;
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normals[i + 2] = smooth[i + 2] * nz +
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(smooth[i] * by + smooth[i + 1] * bz) * ny + bz * nx;
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}
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}
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};
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CTM.restoreMap = function(map, count, precision) {
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var delta, value,
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intMap = new Uint32Array(map.buffer, map.byteOffset, map.length),
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i = 0, j, len = map.length;
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for (; i < count; ++ i) {
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delta = 0;
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for (j = i; j < len; j += count) {
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value = intMap[j];
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delta += value & 1 ? -( (value + 1) >> 1) : value >> 1;
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map[j] = delta * precision;
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}
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}
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};
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CTM.calcSmoothNormals = function(indices, vertices) {
|
|
var smooth = new Float32Array(vertices.length),
|
|
indx, indy, indz, nx, ny, nz,
|
|
v1x, v1y, v1z, v2x, v2y, v2z, len,
|
|
i, k;
|
|
|
|
for (i = 0, k = indices.length; i < k;) {
|
|
indx = indices[i ++] * 3;
|
|
indy = indices[i ++] * 3;
|
|
indz = indices[i ++] * 3;
|
|
|
|
v1x = vertices[indy] - vertices[indx];
|
|
v2x = vertices[indz] - vertices[indx];
|
|
v1y = vertices[indy + 1] - vertices[indx + 1];
|
|
v2y = vertices[indz + 1] - vertices[indx + 1];
|
|
v1z = vertices[indy + 2] - vertices[indx + 2];
|
|
v2z = vertices[indz + 2] - vertices[indx + 2];
|
|
|
|
nx = v1y * v2z - v1z * v2y;
|
|
ny = v1z * v2x - v1x * v2z;
|
|
nz = v1x * v2y - v1y * v2x;
|
|
|
|
len = Math.sqrt(nx * nx + ny * ny + nz * nz);
|
|
if (len > 1e-10) {
|
|
nx /= len;
|
|
ny /= len;
|
|
nz /= len;
|
|
}
|
|
|
|
smooth[indx] += nx;
|
|
smooth[indx + 1] += ny;
|
|
smooth[indx + 2] += nz;
|
|
smooth[indy] += nx;
|
|
smooth[indy + 1] += ny;
|
|
smooth[indy + 2] += nz;
|
|
smooth[indz] += nx;
|
|
smooth[indz + 1] += ny;
|
|
smooth[indz + 2] += nz;
|
|
}
|
|
|
|
for (i = 0, k = smooth.length; i < k; i += 3) {
|
|
len = Math.sqrt(smooth[i] * smooth[i] +
|
|
smooth[i + 1] * smooth[i + 1] +
|
|
smooth[i + 2] * smooth[i + 2]);
|
|
|
|
if (len > 1e-10) {
|
|
smooth[i] /= len;
|
|
smooth[i + 1] /= len;
|
|
smooth[i + 2] /= len;
|
|
}
|
|
}
|
|
|
|
return smooth;
|
|
};
|
|
|
|
CTM.isLittleEndian = (function() {
|
|
var buffer = new ArrayBuffer(2),
|
|
bytes = new Uint8Array(buffer),
|
|
ints = new Uint16Array(buffer);
|
|
|
|
bytes[0] = 1;
|
|
|
|
return ints[0] === 1;
|
|
}());
|
|
|
|
CTM.InterleavedStream = function(data, count) {
|
|
this.data = new Uint8Array(data.buffer, data.byteOffset, data.byteLength);
|
|
this.offset = CTM.isLittleEndian ? 3 : 0;
|
|
this.count = count * 4;
|
|
this.len = this.data.length;
|
|
};
|
|
|
|
CTM.InterleavedStream.prototype.writeByte = function(value) {
|
|
this.data[this.offset] = value;
|
|
|
|
this.offset += this.count;
|
|
if (this.offset >= this.len) {
|
|
|
|
this.offset -= this.len - 4;
|
|
if (this.offset >= this.count) {
|
|
|
|
this.offset -= this.count + (CTM.isLittleEndian ? 1 : -1);
|
|
}
|
|
}
|
|
};
|
|
|
|
CTM.Stream = function(data) {
|
|
this.data = data;
|
|
this.offset = 0;
|
|
};
|
|
|
|
CTM.Stream.prototype.TWO_POW_MINUS23 = Math.pow(2, -23);
|
|
|
|
CTM.Stream.prototype.TWO_POW_MINUS126 = Math.pow(2, -126);
|
|
|
|
CTM.Stream.prototype.readByte = function() {
|
|
return this.data[this.offset ++] & 0xff;
|
|
};
|
|
|
|
CTM.Stream.prototype.readInt32 = function() {
|
|
var i = this.readByte();
|
|
i |= this.readByte() << 8;
|
|
i |= this.readByte() << 16;
|
|
return i | (this.readByte() << 24);
|
|
};
|
|
|
|
CTM.Stream.prototype.readFloat32 = function() {
|
|
var m = this.readByte();
|
|
m += this.readByte() << 8;
|
|
|
|
var b1 = this.readByte();
|
|
var b2 = this.readByte();
|
|
|
|
m += (b1 & 0x7f) << 16;
|
|
var e = ( (b2 & 0x7f) << 1) | ( (b1 & 0x80) >>> 7);
|
|
var s = b2 & 0x80 ? -1 : 1;
|
|
|
|
if (e === 255) {
|
|
return m !== 0 ? NaN : s * Infinity;
|
|
}
|
|
if (e > 0) {
|
|
return s * (1 + (m * this.TWO_POW_MINUS23) ) * Math.pow(2, e - 127);
|
|
}
|
|
if (m !== 0) {
|
|
return s * m * this.TWO_POW_MINUS126;
|
|
}
|
|
return s * 0;
|
|
};
|
|
|
|
CTM.Stream.prototype.readString = function() {
|
|
var len = this.readInt32();
|
|
|
|
this.offset += len;
|
|
|
|
return String.fromCharCode.apply(null, this.data.subarray(this.offset - len, this.offset));
|
|
};
|
|
|
|
CTM.Stream.prototype.readArrayInt32 = function(array) {
|
|
var i = 0, len = array.length;
|
|
|
|
while (i < len) {
|
|
array[i ++] = this.readInt32();
|
|
}
|
|
|
|
return array;
|
|
};
|
|
|
|
CTM.Stream.prototype.readArrayFloat32 = function(array) {
|
|
var i = 0, len = array.length;
|
|
|
|
while (i < len) {
|
|
array[i ++] = this.readFloat32();
|
|
}
|
|
|
|
return array;
|
|
};
|