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draco_nodejs_example.js
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draco_nodejs_example.js
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// Copyright 2017 The Draco Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//
'use_strict';
const fs = require('fs');
const assert = require('assert');
const draco3d = require('draco3d');
// Global decoder and encoder module variables.
let decoderModule = null;
let encoderModule = null;
// The code to create the encoder and decoder modules is asynchronous.
// draco3d.createDecoderModule will return a promise to a funciton with a
// module as a parameter when the module has been fully initialized.
// Create and set the decoder module.
draco3d.createDecoderModule({}).then(function(module) {
// This is reached when everything is ready, and you can call methods on
// Module.
decoderModule = module;
console.log('Decoder Module Initialized!');
modulesInitialized();
});
// Create and set the encoder module.
draco3d.createEncoderModule({}).then(function(module) {
// This is reached when everything is ready, and you can call methods on
// Module.
encoderModule = module;
console.log('Encoder Module Initialized!');
modulesInitialized();
});
function modulesInitialized() {
// Check if both the encoder and decoder modules have been initialized.
if (encoderModule && decoderModule) {
fs.readFile('./bunny.drc', function(err, data) {
if (err) {
return console.log(err);
}
console.log("Decoding file of size " + data.byteLength + " ..");
// Decode mesh
const decoder = new decoderModule.Decoder();
const decodedGeometry = decodeDracoData(data, decoder);
// Encode mesh
encodeMeshToFile(decodedGeometry, decoder);
decoderModule.destroy(decoder);
decoderModule.destroy(decodedGeometry);
});
}
}
function decodeDracoData(rawBuffer, decoder) {
const buffer = new decoderModule.DecoderBuffer();
buffer.Init(new Int8Array(rawBuffer), rawBuffer.byteLength);
const geometryType = decoder.GetEncodedGeometryType(buffer);
let dracoGeometry;
let status;
if (geometryType === decoderModule.TRIANGULAR_MESH) {
dracoGeometry = new decoderModule.Mesh();
status = decoder.DecodeBufferToMesh(buffer, dracoGeometry);
} else if (geometryType === decoderModule.POINT_CLOUD) {
dracoGeometry = new decoderModule.PointCloud();
status = decoder.DecodeBufferToPointCloud(buffer, dracoGeometry);
} else {
const errorMsg = 'Error: Unknown geometry type.';
console.error(errorMsg);
}
decoderModule.destroy(buffer);
return dracoGeometry;
}
function encodeMeshToFile(mesh, decoder) {
const encoder = new encoderModule.Encoder();
const meshBuilder = new encoderModule.MeshBuilder();
// Create a mesh object for storing mesh data.
const newMesh = new encoderModule.Mesh();
const numFaces = mesh.num_faces();
const numIndices = numFaces * 3;
const numPoints = mesh.num_points();
const indices = new Uint32Array(numIndices);
console.log("Number of faces " + numFaces);
console.log("Number of vertices " + numPoints);
// Add Faces to mesh
const ia = new decoderModule.DracoInt32Array();
for (let i = 0; i < numFaces; ++i) {
decoder.GetFaceFromMesh(mesh, i, ia);
const index = i * 3;
indices[index] = ia.GetValue(0);
indices[index + 1] = ia.GetValue(1);
indices[index + 2] = ia.GetValue(2);
}
decoderModule.destroy(ia);
meshBuilder.AddFacesToMesh(newMesh, numFaces, indices);
const attrs = {POSITION: 3, NORMAL: 3, COLOR: 3, TEX_COORD: 2};
Object.keys(attrs).forEach((attr) => {
const stride = attrs[attr];
const numValues = numPoints * stride;
const decoderAttr = decoderModule[attr];
const encoderAttr = encoderModule[attr];
const attrId = decoder.GetAttributeId(mesh, decoderAttr);
if (attrId < 0) {
return;
}
console.log("Adding %s attribute", attr);
const attribute = decoder.GetAttribute(mesh, attrId);
const attributeData = new decoderModule.DracoFloat32Array();
decoder.GetAttributeFloatForAllPoints(mesh, attribute, attributeData);
assert(numValues === attributeData.size(), 'Wrong attribute size.');
const attributeDataArray = new Float32Array(numValues);
for (let i = 0; i < numValues; ++i) {
attributeDataArray[i] = attributeData.GetValue(i);
}
decoderModule.destroy(attributeData);
meshBuilder.AddFloatAttributeToMesh(newMesh, encoderAttr, numPoints,
stride, attributeDataArray);
});
let encodedData = new encoderModule.DracoInt8Array();
// Set encoding options.
encoder.SetSpeedOptions(5, 5);
encoder.SetAttributeQuantization(encoderModule.POSITION, 10);
encoder.SetEncodingMethod(encoderModule.MESH_EDGEBREAKER_ENCODING);
// Encoding.
console.log("Encoding...");
const encodedLen = encoder.EncodeMeshToDracoBuffer(newMesh,
encodedData);
encoderModule.destroy(newMesh);
if (encodedLen > 0) {
console.log("Encoded size is " + encodedLen);
} else {
console.log("Error: Encoding failed.");
}
// Copy encoded data to buffer.
const outputBuffer = new ArrayBuffer(encodedLen);
const outputData = new Int8Array(outputBuffer);
for (let i = 0; i < encodedLen; ++i) {
outputData[i] = encodedData.GetValue(i);
}
encoderModule.destroy(encodedData);
encoderModule.destroy(encoder);
encoderModule.destroy(meshBuilder);
// Write to file. You can view the the file using webgl_loader_draco.html
// example.
fs.writeFile("bunny_10.drc", Buffer.from(outputBuffer), "binary",
function(err) {
if (err) {
console.log(err);
} else {
console.log("The file was saved!");
}
});
}