[vtkusers] Volume rendering Bug when spacing between slices is 0

[Fireman Fireman]

Hello,
 
I have a question regarding volume rendering with gpu based volume ray casting and . 

When I use  the GPURenderDemo example (provided with VTK 5.6.1),the rendering gives an assertion failure
 
Assertion '"check: positive_low_bounds" && lowBounds[2]>= 0.0"'
 
And  when implementing volume rendering with the vtkFixedPointVolumeRayCastMapper there 's no volume rendred (no crash just a black window)
 
I looked at the original images and it seems that spacing between slices is 0 
 
spacing[0] == 0.679688
spacing[1] == 0.679688
spacing[2] == 0
 
 
Please let me know if you have run into this .

How can I avoid this problem ?
 
Thank you in advance




      
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