[vtkusers] vtkVolumeProperty SetColor (bug report)

[Weiguang Guan]

Hi everyone,

I'm not sure whether this is a bug and it's been reported or not if it's a 
bug.

While I design a GUI to let user choose between gray and color transfer
functions in volume raycasting the program crashed with segmentation
fault. I checked the vtkVolumeProperty.* and found that the MTime of gray 
or color won't get updated if one uses the same vtkPiecewiseFunction (or 
vtkColorTransferFunction) pointer as arg of SetColor even though the 
transfer function object itself has changed (using AddPoints for example).

What puzzles me is that the program crashed as well if I create a new 
vtkPiecewiseFunction (or vtkColorTransferFunction) each time I'm going to 
change transfer function.

Am I use it in the way it is supported to.

Weiguang

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Weiguang Guan, Research Engineer
RHPCS, McMaster University
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