isOccluded( renderContext, object ) {

		const renderContextData = this.get( renderContext );

		return renderContextData.occluded && renderContextData.occluded.has( object );

	}
Returns `true` if the given 3D object is fully occluded by other
3D objects in the scene.

@param {RenderContext} renderContext - The render context.
@param {Object3D} object - The 3D object to test.
@return {boolean} Whether the 3D object is fully occluded or not.