[vtk-developers] [VTK 0013070]: vtkFixedPointVolumeRayCastMapper and vtkSobelGradientMagnitudePass

[Mantis Bug Tracker]

The following issue has been SUBMITTED. 
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http://vtk.org/Bug/view.php?id=13070 
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Reported By:                T.R.Shashwath
Assigned To:                
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Project:                    VTK
Issue ID:                   13070
Category:                   (No Category)
Reproducibility:            have not tried
Severity:                   minor
Priority:                   normal
Status:                     backlog
Project:                    Release 
Type:                       incorrect functionality 
Resolution:                 open
Fixed in Version:           
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Date Submitted:             2012-04-10 08:30 EDT
Last Modified:              2012-04-10 08:30 EDT
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Summary:                    vtkFixedPointVolumeRayCastMapper and
vtkSobelGradientMagnitudePass
Description: 
We have a renderer with a volume added to it. On this renderer, we're trying to
add and remove a Sobel pass (in the real world application, the user toggles a
button, and depending on that, we either add or remove a Sobel pass to the
renderer).

When we use a vtkFixedPointVolumeRayCastMapper, when applying the Sobel pass and
then removing it, a black rectangle is left behind, corresponding to the
screen-aligned bounds of the volume. This rectangle never goes away again on
applying or removing any other render passes. Other volume mappers don't seem to
have this problem. A screenshot, test application and test data are attached
(but this happens with any data).

Use 'a' and 'd' in the test application to add or remove the Sobel pass.

There's an unrelated vtk warning display in the application, but I don't think
this causes the problem; this happens with all volume mappers.
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Issue History 
Date Modified    Username       Field                    Change               
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2012-04-10 08:30 T.R.Shashwath  New Issue                                    
2012-04-10 08:30 T.R.Shashwath  File Added: sobel bug.png                    
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