Add existing to tracked

node_modules/@cesium/engine/Source/Workers/createVerticesFromHeightmap.js

@@ -0,0 +1,53 @@
+import Ellipsoid from "../Core/Ellipsoid.js";
+import HeightmapEncoding from "../Core/HeightmapEncoding.js";
+import HeightmapTessellator from "../Core/HeightmapTessellator.js";
+import Rectangle from "../Core/Rectangle.js";
+import RuntimeError from "../Core/RuntimeError.js";
+import Lerc from "lerc";
+import createTaskProcessorWorker from "./createTaskProcessorWorker.js";
+
+function createVerticesFromHeightmap(parameters, transferableObjects) {
+  // LERC encoded buffers must be decoded, then we can process them like normal
+  if (parameters.encoding === HeightmapEncoding.LERC) {
+    let result;
+    try {
+      result = Lerc.decode(parameters.heightmap);
+    } catch (error) {
+      throw new RuntimeError(error);
+    }
+
+    const lercStatistics = result.statistics[0];
+    if (lercStatistics.minValue === Number.MAX_VALUE) {
+      throw new RuntimeError("Invalid tile data");
+    }
+
+    parameters.heightmap = result.pixels[0];
+    parameters.width = result.width;
+    parameters.height = result.height;
+  }
+
+  parameters.ellipsoid = Ellipsoid.clone(parameters.ellipsoid);
+  parameters.rectangle = Rectangle.clone(parameters.rectangle);
+
+  const statistics = HeightmapTessellator.computeVertices(parameters);
+  const vertices = statistics.vertices;
+  transferableObjects.push(vertices.buffer);
+
+  return {
+    vertices: vertices.buffer,
+    numberOfAttributes: statistics.encoding.stride,
+    minimumHeight: statistics.minimumHeight,
+    maximumHeight: statistics.maximumHeight,
+    gridWidth: parameters.width,
+    gridHeight: parameters.height,
+    boundingSphere3D: statistics.boundingSphere3D,
+    orientedBoundingBox: statistics.orientedBoundingBox,
+    occludeePointInScaledSpace: statistics.occludeePointInScaledSpace,
+    encoding: statistics.encoding,
+    westIndicesSouthToNorth: statistics.westIndicesSouthToNorth,
+    southIndicesEastToWest: statistics.southIndicesEastToWest,
+    eastIndicesNorthToSouth: statistics.eastIndicesNorthToSouth,
+    northIndicesWestToEast: statistics.northIndicesWestToEast,
+  };
+}
+export default createTaskProcessorWorker(createVerticesFromHeightmap);