fix(3dtiles): apply matrixWorld to boundingVolume.box

Before this commit we only used the translation part of the transform.
We're now using the full 4x4 matrix to match the wording of the 3dtiles
specification:
"The transform property applies to [...] tile.boundingVolume , except
when tile.boundingVolume.region is defined"

src/Process/3dTilesProcessing.js

@@ -222,20 +222,25 @@ export function pre3dTilesUpdate(context, layer) {
 
 const cameraLocalPosition = new THREE.Vector3();
 const worldPosition = new THREE.Vector3();
+const boundingVolumeBox = new THREE.Box3();
+const boundingVolumeSphere = new THREE.Sphere();
 function computeNodeSSE(camera, node) {
     node.distance = 0;
     if (node.boundingVolume.region) {
         worldPosition.setFromMatrixPosition(node.boundingVolume.region.matrixWorld);
         cameraLocalPosition.copy(camera.camera3D.position).sub(worldPosition);
         node.distance = node.boundingVolume.region.box3D.distanceToPoint(cameraLocalPosition);
     } else if (node.boundingVolume.box) {
-        worldPosition.setFromMatrixPosition(node.matrixWorld);
-        cameraLocalPosition.copy(camera.camera3D.position).sub(worldPosition);
-        node.distance = node.boundingVolume.box.distanceToPoint(cameraLocalPosition);
+        // boundingVolume.box is affected by matrixWorld
+        boundingVolumeBox.copy(node.boundingVolume.box);
+        boundingVolumeBox.applyMatrix4(node.matrixWorld);
+        node.distance = boundingVolumeBox.distanceToPoint(camera.camera3D.position);
     } else if (node.boundingVolume.sphere) {
-        worldPosition.setFromMatrixPosition(node.matrixWorld);
-        cameraLocalPosition.copy(camera.camera3D.position).sub(worldPosition);
-        node.distance = Math.max(0.0, node.boundingVolume.sphere.distanceToPoint(cameraLocalPosition));
+        // boundingVolume.sphere is affected by matrixWorld
+        boundingVolumeSphere.copy(node.boundingVolume.sphere);
+        boundingVolumeSphere.applyMatrix4(node.matrixWorld);
+        node.distance = Math.max(0.0,
+            boundingVolumeSphere.distanceToPoint(camera.camera3D.position));
     } else {
         return Infinity;
     }