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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 | 1x 87x 87x 87x 609x 522x 522x 522x 522x 522x 522x 2088x 87x 87x 87x 87x 87x 92x 92x 92x 192x 192x 192x 192x 87x 87x 87x 87x 87x 87x 87x 87x 87x 87x 87x 2088x 87x 87x 87x 87x 87x 522x 522x 2088x 522x 522x 522x 1034x 1034x 376x 376x 522x 146x 376x 376x 1504x 1504x 1504x 1504x 752x 752x 752x 752x 752x 376x 376x 376x 752x 752x 752x 752x 752x 752x 752x 752x 752x 752x 752x 752x 752x 376x 752x 752x 752x 1696x 1696x 1696x 1696x 376x 376x 376x 752x 376x 376x 376x 376x 376x 376x 376x 376x 87x 87x 87x 86x 87x 92x 87x 87x 87x 87x 87x 87x 1x 92x 92x 92x 92x 92x 1x | import * as macro from 'vtk.js/Sources/macros'; import vtkPolyData from 'vtk.js/Sources/Common/DataModel/PolyData'; const { vtkErrorMacro } = macro; function initPolyIterator(pd) { const polys = pd.getPolys().getData(); const strips = pd.getStrips().getData(); const it = { cellSize: 0, cell: [], done: false, polyIdx: 0, stripIdx: 0, remainingStripLength: 0, // returns a single poly cell next() { if (it.polyIdx < polys.length) { it.cellSize = polys[it.polyIdx]; const start = it.polyIdx + 1; const end = start + it.cellSize; it.polyIdx = end; let p = 0; for (let i = start; i < end; ++i) { it.cell[p++] = polys[i]; } } else Iif (it.stripIdx < strips.length) { it.cellSize = 3; if (it.remainingStripLength === 0) { it.remainingStripLength = strips[it.stripIdx] - 2; // sliding window of 3 points // stripIdx points to the last point in a triangle 3-tuple it.stripIdx += 3; } const start = it.stripIdx - 2; const end = it.stripIdx + 1; it.stripIdx++; it.remainingStripLength--; let p = 0; for (let i = start; i < end; ++i) { it.cell[p++] = strips[i]; } } else if (!it.done) { it.done = true; } else E{ throw new Error('Iterator is done'); } }, }; it.next(); return it; } // ---------------------------------------------------------------------------- // vtkCutter methods // ---------------------------------------------------------------------------- function vtkCutter(publicAPI, model) { // Set our className model.classHierarchy.push('vtkCutter'); // Capture "parentClass" api for internal use const superClass = { ...publicAPI }; publicAPI.getMTime = () => { let mTime = superClass.getMTime(); Iif (!model.cutFunction) { return mTime; } mTime = Math.max(mTime, model.cutFunction.getMTime()); return mTime; }; function dataSetCutter(input, output) { const points = input.getPoints(); const pointsData = points.getData(); const numPts = points.getNumberOfPoints(); const newPointsData = []; const newLinesData = []; const newPolysData = []; if (!model.cutScalars || model.cutScalars.length < numPts) { model.cutScalars = new Float32Array(numPts); } // Loop over all points evaluating scalar function at each point let inOffset = 0; let outOffset = 0; while (inOffset < pointsData.length) { model.cutScalars[outOffset++] = model.cutFunction.evaluateFunction( pointsData[inOffset++], pointsData[inOffset++], pointsData[inOffset++] ); } const crossedEdges = []; const x1 = new Array(3); const x2 = new Array(3); const cellPointsScalars = []; // Loop over all cells; get scalar values for all cell points // and process each cell. /* eslint-disable no-continue */ for (const it = initPolyIterator(input); !it.done; it.next()) { // cell contains the point IDs/indices // Check that cells have at least 3 points Iif (it.cellSize <= 2) { continue; } // Get associated scalar of points that constitute the current cell for (let i = 0; i < it.cellSize; ) { cellPointsScalars[i] = model.cutScalars[it.cell[i++]]; } // Check if all cell points are on same side (same side == cell not crossed by cut function) // TODO: won't work if one point scalar is = 0 ? const sideFirstPoint = cellPointsScalars[0] > 0; let allPointsSameSide = true; for (let i = 1; i < it.cell.length; i++) { const sideCurrentPoint = cellPointsScalars[i] > 0; if (sideCurrentPoint !== sideFirstPoint) { allPointsSameSide = false; break; } } // Go to next cell if cell is not crossed by cut function if (allPointsSameSide) { continue; } // Find and compute edges which intersect cells const intersectedEdgesList = []; for (let i = 0; i < it.cellSize; i++) { const idNext = i + 1 === it.cellSize ? 0 : i + 1; // Go to next edge if edge is not crossed // TODO: in most come cases, (numberOfPointsInCell - 1) or 0 edges of the cell // will be crossed, but if it crosses right at a point, it could be intersecting // with (numberOfPoints) or 1 edge(s). Do we account for that? const signPoint0 = cellPointsScalars[i] > 0; const signPoint1 = cellPointsScalars[idNext] > 0; if (signPoint1 === signPoint0) { continue; } // Compute preferred interpolation direction let e1 = i; let e2 = idNext; let deltaScalar = cellPointsScalars[e2] - cellPointsScalars[e1]; if (deltaScalar <= 0) { e1 = idNext; e2 = i; deltaScalar *= -1; } // linear interpolation let t = 0.0; if (deltaScalar !== 0.0) { t = (model.cutValue - cellPointsScalars[e1]) / deltaScalar; } // points position const pointID1 = it.cell[e1]; const pointID2 = it.cell[e2]; x1[0] = pointsData[pointID1 * 3]; x1[1] = pointsData[pointID1 * 3 + 1]; x1[2] = pointsData[pointID1 * 3 + 2]; x2[0] = pointsData[pointID2 * 3]; x2[1] = pointsData[pointID2 * 3 + 1]; x2[2] = pointsData[pointID2 * 3 + 2]; // Compute the intersected point on edge const computedIntersectedPoint = [ x1[0] + t * (x2[0] - x1[0]), x1[1] + t * (x2[1] - x1[1]), x1[2] + t * (x2[2] - x1[2]), ]; // Keep track of it intersectedEdgesList.push({ pointEdge1: pointID1, // id of one point of the edge pointEdge2: pointID2, // id of one point of the edge intersectedPoint: computedIntersectedPoint, // 3D coordinate of points that intersected edge newPointID: -1, // id of the intersected point when it will be added into vtkPoints }); } // Add points into newPointList for (let i = 0; i < intersectedEdgesList.length; i++) { const intersectedEdge = intersectedEdgesList[i]; let alreadyAdded = false; // Check if point/edge already added for (let j = 0; j < crossedEdges.length; j++) { const crossedEdge = crossedEdges[j]; const sameEdge = intersectedEdge.pointEdge1 === crossedEdge.pointEdge1 && intersectedEdge.pointEdge2 === crossedEdge.pointEdge2; const samePoint = intersectedEdge.intersectedPoint[0] === crossedEdge.intersectedPoint[0] && intersectedEdge.intersectedPoint[1] === crossedEdge.intersectedPoint[1] && intersectedEdge.intersectedPoint[2] === crossedEdge.intersectedPoint[2]; if (sameEdge || samePoint) { alreadyAdded = true; intersectedEdgesList[i].newPointID = crossedEdges[j].newPointID; break; } } if (!alreadyAdded) { newPointsData.push(intersectedEdge.intersectedPoint[0]); newPointsData.push(intersectedEdge.intersectedPoint[1]); newPointsData.push(intersectedEdge.intersectedPoint[2]); intersectedEdgesList[i].newPointID = newPointsData.length / 3 - 1; crossedEdges.push(intersectedEdgesList[i]); } } // Store cells const cellSize = intersectedEdgesList.length; if (cellSize === 2) { newLinesData.push( cellSize, intersectedEdgesList[0].newPointID, intersectedEdgesList[1].newPointID ); } else Eif (cellSize > 2) { newPolysData.push(cellSize); intersectedEdgesList.forEach((edge) => { newPolysData.push(edge.newPointID); }); } } // Set points const outputPoints = output.getPoints(); outputPoints.setData( macro.newTypedArrayFrom(points.getDataType(), newPointsData), 3 ); // Set lines if (newLinesData.length !== 0) { output.getLines().setData(Uint16Array.from(newLinesData)); } // Set polys Iif (newPolysData.length !== 0) { output.getPolys().setData(Uint16Array.from(newPolysData)); } } // expose requestData publicAPI.requestData = (inData, outData) => { // implement requestData const input = inData[0]; Iif (!input) { vtkErrorMacro('Invalid or missing input'); return; } Iif (!model.cutFunction) { vtkErrorMacro('Missing cut function'); return; } const output = vtkPolyData.newInstance(); dataSetCutter(input, output); outData[0] = output; }; } // ---------------------------------------------------------------------------- // Object factory // ---------------------------------------------------------------------------- const DEFAULT_VALUES = { cutFunction: null, // support method with evaluateFunction method cutScalars: null, cutValue: 0.0, }; // ---------------------------------------------------------------------------- export function extend(publicAPI, model, initialValues = {}) { Object.assign(model, DEFAULT_VALUES, initialValues); // Make this a VTK object macro.obj(publicAPI, model); // Also make it an algorithm with one input and one output macro.algo(publicAPI, model, 1, 1); // Set implicit function use to cut the input data (is vtkPlane) macro.setGet(publicAPI, model, ['cutFunction', 'cutValue']); // Object specific methods vtkCutter(publicAPI, model); } // ---------------------------------------------------------------------------- export const newInstance = macro.newInstance(extend, 'vtkCutter'); // ---------------------------------------------------------------------------- export default { newInstance, extend }; |