[vtkusers] vtkPointSpriteMapper details

[Paul Harris]

Hi all, and especially John Biddiscombe,

I am starting to work with vtkPointSpriteMapper, and would like to ask a few
questions:

1) More curiousity than anything else: It looks like you have disabled
display-lists, and it only works in ImmediateMode rendering.  Will
display-lists ever be supported, or do they cause trouble?

2) In this set of code from vtkPointSpriteMapper.cpp line 1522
  int Np = points->GetNumberOfPoints();
  int Nc = input->GetVerts()->GetNumberOfCells();
  if (this->IgnoreVertexCells || Nc==0 || Nc==Np) {
    RenderFlags |= VTK_PSM_USE_POINTS;
  }

Why does the if() include the test for Nc == 0
What if I have a static set of points+colours, and I want to plot none of
them?  I would like to just set the verticies to an empty cell array, but at
the moment it looks like I have to disable or remove the actor from the
renderer.

thanks,
Paul
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