The vtkProp3Ds and assemblies can then be transformed together by transforming just the root assembly of the hierarchy. A vtkAssembly object can be used in place of an vtkProp3D since it is a subclass of vtkProp3D . To add an assembly to the renderer's list of props, you only need to add the root of the assembly. During rendering, the parts of the assembly are rendered during a hierarchical traversal process. Assemblies can consist of hierarchies of assemblies, where one actor or assembly used in one hierarchy is also used in other hierarchies.
Paths consist of an ordered sequence of actors, with transformations properly concatenated.
Reimplemented from vtkProp . For some exporters and other other operations we must be able to collect all the actors or volumes. These methods are used in that process. Reimplemented from vtkProp . NULL means that the bounds are not defined.