Spaces:
Running
Running
File size: 6,673 Bytes
a28eca3 |
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 |
import { Color, ColorManagement, SRGBColorSpace } from 'three';
/**
* Export draco compressed files from threejs geometry objects.
*
* Draco files are compressed and usually are smaller than conventional 3D file formats.
*
* The exporter receives a options object containing
* - decodeSpeed, indicates how to tune the encoder regarding decode speed (0 gives better speed but worst quality)
* - encodeSpeed, indicates how to tune the encoder parameters (0 gives better speed but worst quality)
* - encoderMethod
* - quantization, indicates the presision of each type of data stored in the draco file in the order (POSITION, NORMAL, COLOR, TEX_COORD, GENERIC)
* - exportUvs
* - exportNormals
* - exportColor
*/
/* global DracoEncoderModule */
class DRACOExporter {
parse( object, options = {} ) {
options = Object.assign( {
decodeSpeed: 5,
encodeSpeed: 5,
encoderMethod: DRACOExporter.MESH_EDGEBREAKER_ENCODING,
quantization: [ 16, 8, 8, 8, 8 ],
exportUvs: true,
exportNormals: true,
exportColor: false,
}, options );
if ( DracoEncoderModule === undefined ) {
throw new Error( 'THREE.DRACOExporter: required the draco_encoder to work.' );
}
const geometry = object.geometry;
const dracoEncoder = DracoEncoderModule();
const encoder = new dracoEncoder.Encoder();
let builder;
let dracoObject;
if ( object.isMesh === true ) {
builder = new dracoEncoder.MeshBuilder();
dracoObject = new dracoEncoder.Mesh();
const vertices = geometry.getAttribute( 'position' );
builder.AddFloatAttributeToMesh( dracoObject, dracoEncoder.POSITION, vertices.count, vertices.itemSize, vertices.array );
const faces = geometry.getIndex();
if ( faces !== null ) {
builder.AddFacesToMesh( dracoObject, faces.count / 3, faces.array );
} else {
const faces = new ( vertices.count > 65535 ? Uint32Array : Uint16Array )( vertices.count );
for ( let i = 0; i < faces.length; i ++ ) {
faces[ i ] = i;
}
builder.AddFacesToMesh( dracoObject, vertices.count, faces );
}
if ( options.exportNormals === true ) {
const normals = geometry.getAttribute( 'normal' );
if ( normals !== undefined ) {
builder.AddFloatAttributeToMesh( dracoObject, dracoEncoder.NORMAL, normals.count, normals.itemSize, normals.array );
}
}
if ( options.exportUvs === true ) {
const uvs = geometry.getAttribute( 'uv' );
if ( uvs !== undefined ) {
builder.AddFloatAttributeToMesh( dracoObject, dracoEncoder.TEX_COORD, uvs.count, uvs.itemSize, uvs.array );
}
}
if ( options.exportColor === true ) {
const colors = geometry.getAttribute( 'color' );
if ( colors !== undefined ) {
const array = createVertexColorSRGBArray( colors );
builder.AddFloatAttributeToMesh( dracoObject, dracoEncoder.COLOR, colors.count, colors.itemSize, array );
}
}
} else if ( object.isPoints === true ) {
builder = new dracoEncoder.PointCloudBuilder();
dracoObject = new dracoEncoder.PointCloud();
const vertices = geometry.getAttribute( 'position' );
builder.AddFloatAttribute( dracoObject, dracoEncoder.POSITION, vertices.count, vertices.itemSize, vertices.array );
if ( options.exportColor === true ) {
const colors = geometry.getAttribute( 'color' );
if ( colors !== undefined ) {
const array = createVertexColorSRGBArray( colors );
builder.AddFloatAttribute( dracoObject, dracoEncoder.COLOR, colors.count, colors.itemSize, array );
}
}
} else {
throw new Error( 'DRACOExporter: Unsupported object type.' );
}
//Compress using draco encoder
const encodedData = new dracoEncoder.DracoInt8Array();
//Sets the desired encoding and decoding speed for the given options from 0 (slowest speed, but the best compression) to 10 (fastest, but the worst compression).
const encodeSpeed = ( options.encodeSpeed !== undefined ) ? options.encodeSpeed : 5;
const decodeSpeed = ( options.decodeSpeed !== undefined ) ? options.decodeSpeed : 5;
encoder.SetSpeedOptions( encodeSpeed, decodeSpeed );
// Sets the desired encoding method for a given geometry.
if ( options.encoderMethod !== undefined ) {
encoder.SetEncodingMethod( options.encoderMethod );
}
// Sets the quantization (number of bits used to represent) compression options for a named attribute.
// The attribute values will be quantized in a box defined by the maximum extent of the attribute values.
if ( options.quantization !== undefined ) {
for ( let i = 0; i < 5; i ++ ) {
if ( options.quantization[ i ] !== undefined ) {
encoder.SetAttributeQuantization( i, options.quantization[ i ] );
}
}
}
let length;
if ( object.isMesh === true ) {
length = encoder.EncodeMeshToDracoBuffer( dracoObject, encodedData );
} else {
length = encoder.EncodePointCloudToDracoBuffer( dracoObject, true, encodedData );
}
dracoEncoder.destroy( dracoObject );
if ( length === 0 ) {
throw new Error( 'THREE.DRACOExporter: Draco encoding failed.' );
}
//Copy encoded data to buffer.
const outputData = new Int8Array( new ArrayBuffer( length ) );
for ( let i = 0; i < length; i ++ ) {
outputData[ i ] = encodedData.GetValue( i );
}
dracoEncoder.destroy( encodedData );
dracoEncoder.destroy( encoder );
dracoEncoder.destroy( builder );
return outputData;
}
}
function createVertexColorSRGBArray( attribute ) {
// While .drc files do not specify colorspace, the only 'official' tooling
// is PLY and OBJ converters, which use sRGB. We'll assume sRGB is expected
// for .drc files, but note that Draco buffers embedded in glTF files will
// be Linear-sRGB instead.
const _color = new Color();
const count = attribute.count;
const itemSize = attribute.itemSize;
const array = new Float32Array( count * itemSize );
for ( let i = 0, il = count; i < il; i ++ ) {
_color.fromBufferAttribute( attribute, i );
ColorManagement.fromWorkingColorSpace( _color, SRGBColorSpace );
array[ i * itemSize ] = _color.r;
array[ i * itemSize + 1 ] = _color.g;
array[ i * itemSize + 2 ] = _color.b;
if ( itemSize === 4 ) {
array[ i * itemSize + 3 ] = attribute.getW( i );
}
}
return array;
}
// Encoder methods
DRACOExporter.MESH_EDGEBREAKER_ENCODING = 1;
DRACOExporter.MESH_SEQUENTIAL_ENCODING = 0;
// Geometry type
DRACOExporter.POINT_CLOUD = 0;
DRACOExporter.TRIANGULAR_MESH = 1;
// Attribute type
DRACOExporter.INVALID = - 1;
DRACOExporter.POSITION = 0;
DRACOExporter.NORMAL = 1;
DRACOExporter.COLOR = 2;
DRACOExporter.TEX_COORD = 3;
DRACOExporter.GENERIC = 4;
export { DRACOExporter };
|