Determines if the sky box will be shown.
The sources used to create the cube map faces: an object
with positiveX, negativeX, positiveY,
negativeY, positiveZ, and negativeZ properties.
These can be either URLs or Image objects.
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.
Once an object is destroyed, it should not be used; calling any function other than
isDestroyed will result in a DeveloperError exception. Therefore,
assign the return value (undefined) to the object as done in the example.
Returns true if this object was destroyed; otherwise, false.
If this object was destroyed, it should not be used; calling any function other than
isDestroyed will result in a DeveloperError exception.
true if this object was destroyed; otherwise, false.
Called when Viewer or {@link CesiumWidget} render the scene to get the draw commands needed to render this primitive.
Do not call this function directly. This is documented just to list the exceptions that may be propagated when the scene is rendered:
设置天空盒的模型矩阵