This is done by projecting the vtkPolyData twice - first capturing a near Z buffer, then capturing a far Z buffer. If a matrix source is set, then the PolyData will first be transformed according to the matrix of the given actor or volume. Create a display list from the poly data. The constructor for the class.
Nothing needs to be done.
Set the matrix source to be an actor. Set the matrix source to be a volume. Print the object including the PolyData, the matrix source, and the build time.