View Issue Details [ Jump to Notes ] [ Print ]
IDProjectCategoryView StatusDate SubmittedLast Update
0008549VTKEdgepublic2009-02-17 03:352010-08-24 11:27
ReporterGianluca 
Assigned ToFrançois Bertel 
PrioritynormalSeveritymajorReproducibilityalways
StatusresolvedResolutionfixed 
PlatformOSOS Version
Summary0008549: Volume rendering deformation
DescriptionWhen I use the vtkKWEVolumeMapper to render a (16 bit) volume in a window, I notice a strange "deformation" in the volume when I look from some point of view (usually at the corners). Look at this recorded video:

http://it.youtube.com/watch?v=C_GA6UHbUGo [^]

I use a perspective camera (the problem is always present, but it's by far more noticeable when I look at the volume closely). I notice that when I use a parallel projection camera the problem disappear. If I use software raycasting the problem disappear too. So, seems that it's a problem related to the GPU implementation of the ray-casting algorithm (class vtkKWEOpenGLGPUVolumeRayCastMapper) when a perspective camera is used.
I suspect that the problem could be related to the determination of the rays entry/exit point.
Additional InformationHere some info about the volume I used in the video:

ImageSize = (512, 512)
Number of Slice = 461
PixelSpacing = (0.71875, 0.71875)
SliceDistance = 1.5
BitDepth = 16
URL of dataset: http://pubimage.hcuge.ch:8080/DATA/MACOESSIX.zip [^] (130 Mb, folder: CT1 abdomen\AVEC I.V. - 5305).

----------

System configuration:

- Windows XP SP3;
- Visual Studio 2005 SP1;
- CPU: QuadCore Intel Core 2 Extreme QX9770 (3,4 Ghz) - FSB 1600 Mhz;
- GPU: 2 x nVidia Geforce GTX 280 (2 x 1GB) (connected in SLI);
- RAM: 4 GB DDR3 (1333 Mhz);
- MB: Asus Striker II Extreme (nVidia nForce 790i Ultra SLI);
TagsNo tags attached.
Attached Files

 Relationships
related to 0008548resolvedFrançois Bertel clipping planes with vtkKWEGPUVolumeRayCastMapper doesn't work properly 

  Notes
(0019674)
François Bertel (developer)
2010-03-01 19:55

 Thanks to Julien Finet, this bug is probably fixed in VTK/VolumeRendering/vtkOpenGLGPUVolumeRayCastMapper.cxx Revision: 1.8
(0019918)
Gianluca (reporter)
2010-03-17 03:19

 Hi, I have tested the new version, but all the bugs still occurs (including the related 0008548).
(0021733)
Gianluca (reporter)
2010-08-12 09:39

 I found and fix the bug, but I'm not sure how to signal this correctly. I posted the solution on the user and developer list.
(0021917)
François Bertel (developer)
2010-08-24 11:22

 This is the post with the fix:
http://www.vtk.org/pipermail/vtkusers/2010-August/110978.html [^]
(0021918)
François Bertel (developer)
2010-08-24 11:27

 Patch applied and adapted in VTK commit 5c582950680a3b218e7d217a6bb4bc98ca472789

http://vtk.org/gitweb?p=VTK.git;a=commit;h=5c582950680a3b218e7d217a6bb4bc98ca472789 [^]

 Issue History
Date Modified Username Field Change
2009-02-17 03:35 Gianluca New Issue
2010-03-01 19:53 François Bertel Status new => assigned
2010-03-01 19:53 François Bertel Assigned To => François Bertel
2010-03-01 19:55 François Bertel Note Added: 0019674
2010-03-01 19:55 François Bertel Status assigned => feedback
2010-03-01 19:56 François Bertel Relationship added related to 0008548
2010-03-17 03:19 Gianluca Note Added: 0019918
2010-08-12 09:39 Gianluca Note Added: 0021733
2010-08-24 11:22 François Bertel Note Added: 0021917
2010-08-24 11:27 François Bertel Note Added: 0021918
2010-08-24 11:27 François Bertel Status feedback => resolved
2010-08-24 11:27 François Bertel Resolution open => fixed

Copyright © 2000 - 2018 MantisBT Team