function getDefaultSkyBoxUrl(suffix) {
  return buildModuleUrl(`Assets/Textures/SkyBox/tycho2t3_80_${suffix}.jpg`);
}
Destroys the WebGL resources held by this object.  Destroying an object allows for deterministic
release of WebGL resources, instead of relying on the garbage collector to destroy this object.
<br /><br />
Once an object is destroyed, it should not be used; calling any function other than
<code>isDestroyed</code> will result in a {@link DeveloperError} exception.  Therefore,
assign the return value (<code>undefined</code>) to the object as done in the example.

@exception {DeveloperError} This object was destroyed, i.e., destroy() was called.


@example
skyBox = skyBox && skyBox.destroy();

@see SkyBox#isDestroyed