Press n or j to go to the next uncovered block, b, p or k for the previous block.
| 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 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 | 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x | import DataAccessHelper from 'vtk.js/Sources/IO/Core/DataAccessHelper';
import macro from 'vtk.js/Sources/macros';
import vtkCellArray from 'vtk.js/Sources/Common/Core/CellArray';
import vtkDataArray from 'vtk.js/Sources/Common/Core/DataArray';
import vtkPolyData from 'vtk.js/Sources/Common/DataModel/PolyData';
// Enable data soure for DataAccessHelper
import 'vtk.js/Sources/IO/Core/DataAccessHelper/LiteHttpDataAccessHelper'; // Just need HTTP
// import 'vtk.js/Sources/IO/Core/DataAccessHelper/HttpDataAccessHelper'; // HTTP + zip
// import 'vtk.js/Sources/IO/Core/DataAccessHelper/HtmlDataAccessHelper'; // html + base64 + zip
// import 'vtk.js/Sources/IO/Core/DataAccessHelper/JSZipDataAccessHelper'; // zip
const { vtkErrorMacro } = macro;
let decoderModule = {};
// ----------------------------------------------------------------------------
// static methods
// ----------------------------------------------------------------------------
/**
* Load the WASM decoder from url and set the decoderModule
* @param url
* @param binaryName
* @return {Promise<boolean>}
*/
function setWasmBinary(url, binaryName) {
const dracoDecoderType = {};
return new Promise((resolve, reject) => {
dracoDecoderType.wasmBinaryFile = binaryName;
const xhr = new XMLHttpRequest();
xhr.open('GET', url, true);
xhr.responseType = 'arraybuffer';
xhr.onload = () => {
if (xhr.status === 200) {
dracoDecoderType.wasmBinary = xhr.response;
// Use Promise.resolve to be compatible with versions before Draco 1.4.0
Promise.resolve(window.DracoDecoderModule(dracoDecoderType)).then(
(module) => {
decoderModule = module;
resolve(true);
},
reject
);
} else {
reject(Error(`WASM binary could not be loaded: ${xhr.statusText}`));
}
};
xhr.send(null);
});
}
function setDracoDecoder(createDracoModule) {
decoderModule = createDracoModule({});
}
function getDracoDecoder() {
return decoderModule;
}
// ----------------------------------------------------------------------------
// vtkDracoReader methods
// ----------------------------------------------------------------------------
function decodeBuffer(buffer) {
const byteArray = new Int8Array(buffer);
const decoder = new decoderModule.Decoder();
const decoderBuffer = new decoderModule.DecoderBuffer();
decoderBuffer.Init(byteArray, byteArray.length);
const geometryType = decoder.GetEncodedGeometryType(decoderBuffer);
let dracoGeometry;
if (geometryType === decoderModule.TRIANGULAR_MESH) {
dracoGeometry = new decoderModule.Mesh();
const status = decoder.DecodeBufferToMesh(decoderBuffer, dracoGeometry);
if (!status.ok()) {
vtkErrorMacro(`Could not decode Draco file: ${status.error_msg()}`);
}
} else {
vtkErrorMacro('Wrong geometry type, expected mesh, got point cloud.');
}
decoderModule.destroy(decoderBuffer);
decoderModule.destroy(decoder);
return dracoGeometry;
}
function getDracoAttributeAsFloat32Array(dracoGeometry, attributeId) {
const decoder = new decoderModule.Decoder();
const attribute = decoder.GetAttribute(dracoGeometry, attributeId);
const numberOfComponents = attribute.num_components();
const numberOfPoints = dracoGeometry.num_points();
const attributeData = new decoderModule.DracoFloat32Array();
decoder.GetAttributeFloatForAllPoints(
dracoGeometry,
attribute,
attributeData
);
let i = numberOfPoints * numberOfComponents;
const attributeArray = new Float32Array(i);
while (i--) {
attributeArray[i] = attributeData.GetValue(i);
}
return attributeArray;
}
function getPolyDataFromDracoGeometry(dracoGeometry) {
const decoder = new decoderModule.Decoder();
// Get position attribute ID
const positionAttributeId = decoder.GetAttributeId(
dracoGeometry,
decoderModule.POSITION
);
if (positionAttributeId === -1) {
console.error('No position attribute found in the decoded model.');
decoderModule.destroy(decoder);
decoderModule.destroy(dracoGeometry);
return null;
}
const positionArray = getDracoAttributeAsFloat32Array(
dracoGeometry,
positionAttributeId,
decoderModule
);
// Read indices
let i = dracoGeometry.num_faces();
const indices = new Uint32Array(i * 4);
const indicesArray = new decoderModule.DracoInt32Array();
while (i--) {
decoder.GetFaceFromMesh(dracoGeometry, i, indicesArray);
const index = i * 4;
indices[index] = 3;
indices[index + 1] = indicesArray.GetValue(0);
indices[index + 2] = indicesArray.GetValue(1);
indices[index + 3] = indicesArray.GetValue(2);
}
// Create polyData and add positions and indinces
const cellArray = vtkCellArray.newInstance({ values: indices });
const polyData = vtkPolyData.newInstance({ polys: cellArray });
polyData.getPoints().setData(positionArray);
// Look for other attributes
const pointData = polyData.getPointData();
// Normals
const normalAttributeId = decoder.GetAttributeId(
dracoGeometry,
decoderModule.NORMAL
);
if (normalAttributeId !== -1) {
const normalArray = getDracoAttributeAsFloat32Array(
dracoGeometry,
decoderModule.NORMAL,
decoderModule
);
const normals = vtkDataArray.newInstance({
numberOfComponents: 3,
values: normalArray,
name: 'Normals',
});
pointData.setNormals(normals);
}
// Texture coordinates
const texCoordAttributeId = decoder.GetAttributeId(
dracoGeometry,
decoderModule.TEX_COORD
);
if (texCoordAttributeId !== -1) {
const texCoordArray = getDracoAttributeAsFloat32Array(
dracoGeometry,
texCoordAttributeId,
decoderModule
);
const texCoords = vtkDataArray.newInstance({
numberOfComponents: 2,
values: texCoordArray,
name: 'TCoords',
});
pointData.setTCoords(texCoords);
}
// Scalars
const colorAttributeId = decoder.GetAttributeId(
dracoGeometry,
decoderModule.COLOR
);
if (colorAttributeId !== -1) {
const colorArray = getDracoAttributeAsFloat32Array(
dracoGeometry,
colorAttributeId,
decoderModule
);
const scalars = vtkDataArray.newInstance({
numberOfComponents: 3,
values: colorArray,
name: 'Scalars',
});
pointData.setScalars(scalars);
}
decoderModule.destroy(decoder);
return polyData;
}
function vtkDracoReader(publicAPI, model) {
// Set our className
model.classHierarchy.push('vtkDracoReader');
// Create default dataAccessHelper if not available
if (!model.dataAccessHelper) {
model.dataAccessHelper = DataAccessHelper.get('http');
}
// Internal method to fetch Array
function fetchData(url, option = {}) {
const { compression, progressCallback } = model;
if (option.binary) {
return model.dataAccessHelper.fetchBinary(url, {
compression,
progressCallback,
});
}
return model.dataAccessHelper.fetchText(publicAPI, url, {
compression,
progressCallback,
});
}
// Set DataSet url
publicAPI.setUrl = (url, option = { binary: true }) => {
model.url = url;
// Remove the file in the URL
const path = url.split('/');
path.pop();
model.baseURL = path.join('/');
model.compression = option.compression;
// Fetch metadata
return publicAPI.loadData({
progressCallback: option.progressCallback,
binary: !!option.binary,
});
};
// Fetch the actual data arrays
publicAPI.loadData = (option = {}) => {
const promise = fetchData(model.url, option);
promise.then(publicAPI.parse);
return promise;
};
publicAPI.parse = (content) => {
publicAPI.parseAsArrayBuffer(content);
};
publicAPI.parseAsArrayBuffer = (content) => {
if (!content) {
return;
}
if (content !== model.parseData) {
publicAPI.modified();
} else {
return;
}
model.parseData = content;
const dracoGeometry = decodeBuffer(content);
const polyData = getPolyDataFromDracoGeometry(dracoGeometry);
decoderModule.destroy(dracoGeometry);
model.output[0] = polyData;
};
publicAPI.requestData = () => {
publicAPI.parse(model.parseData);
};
}
// ----------------------------------------------------------------------------
// Object factory
// ----------------------------------------------------------------------------
const DEFAULT_VALUES = {
// baseURL: null,
// dataAccessHelper: null,
// url: null,
};
// ----------------------------------------------------------------------------
export function extend(publicAPI, model, initialValues = {}) {
Object.assign(model, DEFAULT_VALUES, initialValues);
// Build VTK API
macro.obj(publicAPI, model);
macro.get(publicAPI, model, ['url', 'baseURL']);
macro.setGet(publicAPI, model, ['dataAccessHelper']);
macro.algo(publicAPI, model, 0, 1);
// vtkDracoReader methods
vtkDracoReader(publicAPI, model);
// To support destructuring
if (!model.compression) {
model.compression = null;
}
if (!model.progressCallback) {
model.progressCallback = null;
}
}
// ----------------------------------------------------------------------------
export const newInstance = macro.newInstance(extend, 'vtkDracoReader');
// ----------------------------------------------------------------------------
export default {
extend,
newInstance,
setDracoDecoder,
setWasmBinary,
getDracoDecoder,
};
|