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IDProjectCategoryView StatusDate SubmittedLast Update
0004139VTK(No Category)public2006-12-05 12:442008-02-18 18:51
ReporterAndras Lasso 
Assigned ToDavid Cole 
PrioritynormalSeveritymajorReproducibilityalways
StatusclosedResolutionfixed 
PlatformOSOS Version
Product Version 
Target VersionFixed in Version 
Summary0004139: Off-screen rendering inconsistency if window center is changed
DescriptionI've found an inconsistency between normal rendering and off-screen rendering results when I change the window center. (VTK 5.0.1)
 
It seems that renderer->GetActiveCamera()->SetWindowCenter(x,y) method has no effect when off-screen rendering is used (by vtkWindowToImageFilter). Do you know if there is a specific reason for this or is it a bug?
 
Possible fix:
I suspect that it is due to a bug in void vtkWindowToImageFilter::RequestData(...) because we read the windowCenters (by cams[i]->GetWindowCenter(windowCenters+i*2)) but then we don't use them for anything.

Changing the cam->SetWindowCenter(deltax,deltay); line to cam->SetWindowCenter(windowCenters[i*2]+deltax,windowCenters[i*2+1]+deltay); would solve the problem (I've performed a few tests and it seems to work fine).
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Attached Filespng file icon WindowToImageFilter_shift_onscreen.png [^] (9,945 bytes) 1969-12-31 19:00


png file icon WindowToImageFilter_shift_offscreen.png [^] (1,180 bytes) 1969-12-31 19:00


? file icon WindowToImageFilter_shift.tcl [^] (789 bytes) 1969-12-31 19:00
cxx file icon vtkWindowToImageFilter.cxx [^] (14,520 bytes) 1969-12-31 19:00

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  Notes
(0006296)
Andras Lasso (reporter)
2007-01-31 08:37

 Uploaded a test script to demonstrate the issue, and the resulting on screen and off screen rendered images.

The problem can be fixed by modifying line 310 of vtkWindowToImageFilter.cxx. Modified file uploaded.
(0006392)
David Cole (developer)
2007-02-10 08:40

 Fixed in CVS HEAD. Will merge to VTK-5-0 after a night on the dashboards...

BUG: Fix http://www.vtk.org/Bug/bug.php?op=show&bugid=4139 [^] - use correct window center in vtkWindowToImageFilter - thanks to Andras Lasso of GE Healthcare for the bug report and the fix.

/cvsroot/VTK/VTK/Rendering/vtkWindowToImageFilter.cxx,v <-- vtkWindowToImageFilter.cxx
new revision: 1.48; previous revision: 1.47
(0006968)
David Cole (developer)
2007-03-28 10:21

 Fix merged to the VTK-5-0 branch on 2007-03-28, Rendering/vtkWindowToImageFilter.cxx, revision 1.39.4.1
(0006980)
David Cole (developer)
2007-03-28 16:53

 This is fixed as of now in the VTK-5-0 CVS branch.

The fix will also be inluded in the upcoming VTK 5.0.3 release.
(0010560)
David Cole (developer)
2008-02-18 18:51

 Closed - no new data since fix was committed.

 Issue History
Date Modified Username Field Change
2008-02-18 18:51 David Cole Status @80@ => closed
2008-02-18 18:51 David Cole Note Added: 0010560
2011-06-16 13:11 Zack Galbreath Category => (No Category)

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