PR feedback part 2

packages/engine/Source/Core/Cesium3DTilesTerrainData.js

@@ -858,7 +858,7 @@ const scratchUv2 = new Cartesian2();
 const scratchBary = new Cartesian3();
 
 /**
- * Computes the terrain height at a specified longitude and latitude.
+ * Computes the terrain height at a specified longitude and latitude. Returns 0.0 if the position is outside the mesh.
  * @private
  * @param {TerrainMesh} mesh The terrain mesh.
  * @param {Rectangle} rectangle The rectangle covered by this terrain data.
@@ -923,6 +923,7 @@ function interpolateMeshHeight(mesh, rectangle, longitude, latitude) {
   }
 
   // Position does not lie in any triangle in this mesh.
+  // This should not happen often since we start by clamping to the rectangle.
   return 0.0;
 }
 

packages/engine/Source/Core/TerrainProvider.js

@@ -15,6 +15,7 @@ import CesiumMath from "./Math.js";
  * @see CesiumTerrainProvider
  * @see VRTheWorldTerrainProvider
  * @see GoogleEarthEnterpriseTerrainProvider
+ * @see ArcGISTiledElevationTerrainProvider
  * @see Cesium3DTilesTerrainProvider
  */
 function TerrainProvider() {

packages/sandcastle/gallery/globe-materials-3d-tiles-terrain/sandcastle.yaml

@@ -1,6 +1,8 @@
 legacyId: Globe Materials – 3D Tiles Terrain.html
 title: Globe Materials – 3D Tiles Terrain
-description: Apply materials to the globe.
+description: Load a 3D Tiles tileset as terrain, and apply globe material properties to style the terrain.
 labels:
+  - 3D Tiles
+  - Terrain
   - Showcases
 thumbnail: thumbnail.jpg