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0013151

VTK

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public

2012-05-07 04:20

2013-10-30 14:03

Reporter

Benoît Bleuzé

Assigned To

Dan Lipsa

Priority

normal

Severity

minor

Reproducibility

have not tried

Status

closed

Resolution

fixed

Platform

OS Version

Product Version

5.8.0

Target Version

Fixed in Version

Summary

0013151: Incorrect assert in volume rendering shading with dependent components

Description

Hi,
I mentioned this problem on the user mailing list, but no one seemed to take any interest in it, so I am filing this as a bug, even if I am not sure it is desirable behaviour:

I am doing volume rendering of an rgba volume (4 channels 3d image).
To do this I set the following 2 vtkVolume properties:

     vtkVolumeProperty::IndependentComponentsOff()
and vtkVolumeProperty::ShadeOn()

I use the GPU Rendering: vtkGPUVolumeRayCastMapper

As a result, if I compile vtk in debug mode I stumble upon this failing assert call,
in vtkOpenGLGPUVolumeRayCastMapper.cxx, line 4159 in vtk 5.8.0 (in git at this time it's on line 4152),
in the following method:

void vtkOpenGLGPUVolumeRayCastMapper::PreRender(vtkRenderer *ren,
                                                vtkVolume *vol,
                                                double datasetBounds[6],
                                                double scalarRange[2],
                                                int numberOfScalarComponents,
                                                unsigned int numberOfLevels)
[...]
if ( vol->GetProperty()->GetShade() )
        {
        shadeMethod=vtkOpenGLGPUVolumeRayCastMapperShadeYes;
        assert("check: only_1_component_todo" && numberOfScalarComponents==1);
        }

[...]

If I run the same code in Release mode, nothing goes wrong and there is indeed shading performed on my rgba data.
Should this assert be removed, or is shading on dependent components not something to do?

I reckon this is indeed a dangling assert from a tiem this was not possible. But maybe I am just lucky that it works. In the latter case, I do apologise for the noise, but would like to get the reasoning behind this assert.

Best wishes,
Benoit Bleuzé

Steps To Reproduce

In the following VTK test

Rendering/Volume/Testing/Cxx/TestGPURayCastFourComponentsComposite.cxx

set ShadeOn.

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TBD

Type

crash

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Issue History
Date Modified	Username	Field	Change
2012-05-07 04:20	Benoît Bleuzé	New Issue
2013-10-21 13:46	Dan Lipsa	Assigned To	=> Dan Lipsa
2013-10-21 13:46	Dan Lipsa	Status	backlog => tabled
2013-10-21 14:18	Dave DeMarle	Status	tabled => backlog
2013-10-28 14:00	Dan Lipsa	Status	backlog => gerrit review
2013-10-28 14:00	Dan Lipsa	Resolution	open => fixed
2013-10-28 14:00	Dan Lipsa	Steps to Reproduce Updated
2013-10-29 14:51	Dan Lipsa	Steps to Reproduce Updated
2013-10-29 16:11	Dan Lipsa	Steps to Reproduce Updated
2013-10-30 14:03	Dan Lipsa	Status	gerrit review => closed