Hardware clipping planes in VTK

[David Gobbi]

I have added hardware clipping planes to VTK, and would
like to get some feedback before contributing the change
to Kitware.

All of the changes are limited to vtkPolyDataMapper, which has
the following new methods:

void vtkPolyDataMapper::SetClippingPlanes(vtkImplicitFunctionCollection)
vtkImplicitFunctionCollection vtkPolyDataMapper::GetClippingPlanes()

These allow you to specify up to 6 clipping planes which are
handled by OpenGL.  This is equivalent to piping vtkPolyData
through a set of vtkClipPolyData filters.  When you are moving
the clipping planes around, doing the clipping in hardware 
makes the rendering go several times faster.

 - David

--David Gobbi, MSc                    dgobbi at irus.rri.on.ca
  Advanced Imaging Research Group
  Robarts Research Institute, University of Western Ontario



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