Section: Visualization Toolkit Rendering Classes
Directions to write a subclass of vtkRenderPass: It is up to the subclass to decide if it needs to delegate part of its job to some other vtkRenderPass objects ("delegates"). - The subclass has to define ivar to set/get its delegates. - The documentation of the subclass has to describe: - what each delegate is supposed to perform - if a delegate is supposed to be used once or multiple times - what it expects to have in the framebuffer before starting (status of colorbuffers, depth buffer, stencil buffer) - what it will change in the framebuffer. - A pass cannot modify the vtkRenderState where it will perform but it can build a new vtkRenderState (it can change the FrameBuffer, change the prop array, changed the required prop properties keys (usually adding some to a copy of the existing list) but it has to keep the same vtkRenderer object), make it current and pass it to its delegate. - at the end of the execution of Render, the pass has to ensure the current vtkRenderState is the one it has in argument.
To create an instance of class vtkRenderPass, simply invoke its constructor as follows
obj = vtkRenderPass
obj
is an instance of the vtkRenderPass class.
string = obj.GetClassName ()
int = obj.IsA (string name)
vtkRenderPass = obj.NewInstance ()
vtkRenderPass = obj.SafeDownCast (vtkObject o)
int = obj.GetNumberOfRenderedProps ()
- Number of props rendered at the last Render call.
obj.ReleaseGraphicsResources (vtkWindow w)
- Release graphics resources and ask components to release their own
resources. Default implementation is empty.
\pre w_exists: w!=0