Add existing to tracked

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

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+import createTaskProcessorWorker from "./createTaskProcessorWorker.js";
+import Matrix4 from "../Core/Matrix4.js";
+import Cartesian3 from "../Core/Cartesian3.js";
+import AxisAlignedBoundingBox from "../Core/AxisAlignedBoundingBox.js";
+
+const scratchAABBCornerMin = new Cartesian3();
+const scratchAABBCornerMax = new Cartesian3();
+const scratchTrianglePoints = [
+  new Cartesian3(),
+  new Cartesian3(),
+  new Cartesian3(),
+];
+const scratchTriangleAABB = new AxisAlignedBoundingBox();
+
+const TILE_AABB_MAX = new Cartesian3(0.5, 0.5, 0.5);
+const TILE_AABB_MIN = new Cartesian3(-0.5, -0.5, -0.5);
+
+/**
+ * Builds the next layer of the terrain picker's quadtree by determining which triangles intersect
+ * each of the four child nodes. (Essentially distributing the parent's triangles to its children.)
+ *
+ * Takes in the AABBs of the four child nodes in the tree's local space, an inverse transform
+ * to convert triangle positions to the tree's local space, and the parent node's triangle indices and positions.
+ *
+ * Returns an four arrays - one for each child node - containing the indices of the triangles that intersect each node.
+ * @ignore
+ */
+function incrementallyBuildTerrainPicker(parameters, transferableObjects) {
+  // Rehydrate worker inputs
+  const aabbs = new Float64Array(parameters.aabbs);
+  const nodeAABBs = Array.from({ length: 4 }, (_, i) => {
+    const min = Cartesian3.unpack(aabbs, i * 6, scratchAABBCornerMin);
+    const max = Cartesian3.unpack(aabbs, i * 6 + 3, scratchAABBCornerMax);
+    return AxisAlignedBoundingBox.fromCorners(
+      min,
+      max,
+      new AxisAlignedBoundingBox(),
+    );
+  });
+
+  const inverseTransformArray = new Float64Array(parameters.inverseTransform);
+  const inverseTransform = Matrix4.unpack(
+    inverseTransformArray,
+    0,
+    new Matrix4(),
+  );
+
+  const triangleIndices = new Uint32Array(parameters.triangleIndices);
+  const trianglePositions = new Float64Array(parameters.trianglePositions);
+  const intersectingTrianglesArrays = Array.from({ length: 4 }, () => []);
+
+  for (let j = 0; j < triangleIndices.length; j++) {
+    Cartesian3.unpack(trianglePositions, j * 9, scratchTrianglePoints[0]);
+    Cartesian3.unpack(trianglePositions, j * 9 + 3, scratchTrianglePoints[1]);
+    Cartesian3.unpack(trianglePositions, j * 9 + 6, scratchTrianglePoints[2]);
+
+    const triangleAABB = createAABBFromTriangle(
+      inverseTransform,
+      scratchTrianglePoints,
+    );
+
+    for (let i = 0; i < 4; i++) {
+      const aabbsIntersect =
+        nodeAABBs[i].intersectAxisAlignedBoundingBox(triangleAABB);
+      if (!aabbsIntersect) {
+        continue;
+      }
+
+      intersectingTrianglesArrays[i].push(triangleIndices[j]);
+    }
+  }
+
+  const intersectingTrianglesTypedArrays = intersectingTrianglesArrays.map(
+    (array) => {
+      const uintArray = new Uint32Array(array);
+      transferableObjects.push(uintArray.buffer);
+      return uintArray.buffer;
+    },
+  );
+
+  return {
+    intersectingTrianglesArrays: intersectingTrianglesTypedArrays,
+  };
+}
+
+/**
+ * Creates a tree-space axis-aligned bounding box from the given triangle points and inverse transform (from world to tree space).
+ * @param {Matrix4} inverseTransform transform from world space to tree local space
+ * @param {Cartesian3[]} trianglePoints array of 3 Cartesian3 points representing the triangle
+ * @returns {AxisAlignedBoundingBox} the axis-aligned bounding box enclosing the triangle in tree local space
+ * @ignore
+ */
+function createAABBFromTriangle(inverseTransform, trianglePoints) {
+  Matrix4.multiplyByPoint(
+    inverseTransform,
+    trianglePoints[0],
+    trianglePoints[0],
+  );
+  Matrix4.multiplyByPoint(
+    inverseTransform,
+    trianglePoints[1],
+    trianglePoints[1],
+  );
+  Matrix4.multiplyByPoint(
+    inverseTransform,
+    trianglePoints[2],
+    trianglePoints[2],
+  );
+
+  const aabb = AxisAlignedBoundingBox.fromPoints(
+    trianglePoints,
+    scratchTriangleAABB,
+  );
+
+  // In 2D mode, sometimes the height-scale of a tile is 0. See {@link TerrainMesh#computeTransform2D}.
+  // This makes the inverseTransform degenerate, so we set the height-scale to 1 to be prevent that. However, this is artificial and
+  // can lead to the triangle's AABB extending beyond the (height) bounds of the tile's AABB.
+  // Thus, we clamp the triangle's AABB to the tile's local-space AABB.
+  Cartesian3.clamp(aabb.minimum, TILE_AABB_MIN, TILE_AABB_MAX, aabb.minimum);
+  Cartesian3.clamp(aabb.maximum, TILE_AABB_MIN, TILE_AABB_MAX, aabb.maximum);
+  return aabb;
+}
+
+export default createTaskProcessorWorker(incrementallyBuildTerrainPicker);