[vtkusers] Purpose of vtkDisplayListPainter

[Moreland, Kenneth]

The vtkDisplayListPainter works in conjunction with another painter.
Assuming immediate mode rendering is off, the first call to
vtkDisplayListPainter::Render compiles a display list by calling Render
on another painter wrapped around glNewList and glEndList.  Subsequent
calls to vtkDisplayListPainter::Render simply call the display list
created to effectively do what the other painter would render, but
faster.
 
vtkDisplayListPainter generally speeds up the rendering of any other
painter, although there is a penalty of extra memory consumption and an
added overhead every time the data changes.
 
-Ken


________________________________

	From: vtkusers-bounces+kmorel=sandia.gov at vtk.org
[mailto:vtkusers-bounces+kmorel=sandia.gov at vtk.org] On Behalf Of Imran
Ahmed Khan
	Sent: Thursday, March 23, 2006 6:45 AM
	To: vtkusers at vtk.org
	Subject: [vtkusers] Purpose of vtkDisplayListPainter
	
	
	Hi all,
	 
	Can someone expert in vtk tell me that what is the true purpose
of vtkDisplayListPainter class, does it improve the rendering of
identical Polyhedrons/Polygons obtained my transformation matrices. How
can I use it (as there is no example present). What does
vtkDisplayListPainter->Render(vtkRenderer *renderer, vtkActor *actor,
unsigned long typeflags) do ? its a function present in the super
classes(vtkPainter, vtkPolyDataPainter) of vtkDisplayListPainter. 
	 
	Can someone please help me out ?
	 
	Best Regards,
	Imran Ahmed Khan.

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