Fix failing specs

packages/engine/Source/Core/VerticalExaggeration.js

@@ -1,5 +1,6 @@
 import Cartesian3 from "./Cartesian3.js";
 import DeveloperError from "./DeveloperError.js";
+import defined from "./defined.js";
 
 /**
  * @private
@@ -29,6 +30,12 @@ const scratchCartographic = new Cartesian3();
 
 /**
  * Scales a position by exaggeration.
+ *
+ * @param {Cartesian3} position The position.
+ * @param {Ellipsoid} ellipsoid The ellipsoid.
+ * @param {number} verticalExaggeration A scalar used to exaggerate the terrain. If the value is 1.0 there will be no effect.
+ * @param {number} verticalExaggerationRelativeHeight The height relative to which terrain is exaggerated. If the value is 0.0 terrain will be exaggerated relative to the ellipsoid surface.
+ * @param {Cartesian3} [result] The object onto which to store the result.
  */
 VerticalExaggeration.getPosition = function (
   position,
@@ -41,6 +48,10 @@ VerticalExaggeration.getPosition = function (
     position,
     scratchCartographic
   );
+  // If the position is too near the center of the ellipsoid, exaggeration is undefined.
+  if (!defined(cartographic)) {
+    return Cartesian3.clone(position, result);
+  }
   const newHeight = VerticalExaggeration.getHeight(
     cartographic.height,
     verticalExaggeration,

packages/engine/Source/Scene/Cesium3DTile.js

@@ -1797,6 +1797,9 @@ Cesium3DTile.prototype.createBoundingVolume = function (
 
   const { box, region, sphere } = boundingVolumeHeader;
   if (defined(box)) {
+    if (this._verticalExaggeration === 1.0) {
+      return createBox(box, transform, result);
+    }
     const exaggeratedCorners = OrientedBoundingBox.unpack(
       box,
       0,
@@ -1841,6 +1844,9 @@ Cesium3DTile.prototype.createBoundingVolume = function (
     );
   }
   if (defined(sphere)) {
+    if (this._verticalExaggeration === 1.0) {
+      return createSphere(sphere, transform, result);
+    }
     const boundingSphere = BoundingSphere.unpack(
       sphere,
       0,