[vtkusers] Rendering Problem with OpenGL2 backed

[Andrea Borsic]

Dear VTK Users,

I would like to report a problem I am experiencing with the OpenGL2 
back-end and which does not occur under the OpenGL back-end. I am using 
a custom filter that implements a level set method for segmenting 
images, and I can display the evolution of the level set process using 
VTK 5.10 or newer versions of VTK configured to use OpenGL, but not 
under OpenGL2.

In the application there is a for loop where the level set filter is set 
to run a small number of level set iterations (e.g. 5) and than the 
visualization pipeline is updated to show the the zero level set surface 
extracted with a vtkContourFilter.

The above worked fine under OpenGL but I get the following error under 
OpenGL2

The above error occurs on the second visualization attempt


A Python snippet below shows the relevant code:


ls.SetIter(5) # tell the filter to run 5 level set iterations every time 
Update() is called

for i in range(num_cycles):

     print("LS iteration %i of %i\n" % (i*5, num_cycles*5))

     ls.Modified() # set the modified flag on the level set filter so 
that the Update() call results in a re-run
     ls.Update() # run more iterations of the level set filter
     contour_filter.Update() # update the zero level set surface
     renWin.Render() # re-render the screen

print("Terminated running LS iterations")

The environment in Windows 10 64bit, VTK 7.0.0, Python 3.5.1


I will be happy to post a full source code example if that helps.

Any comment is welcome,

Thanks,

Best Regards,

Andrea


-- 

++++++++++++++++++++++++++++++++++++
Andrea Borsic Ph.D.
Founder NE Scientific LLC
Tel: +1 603 676 7450
Web: www.ne-scientific.com
Twitter: https://twitter.com/ne_scientific

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://public.kitware.com/pipermail/vtkusers/attachments/20160706/d6ae4ea2/attachment.html>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: ilofghfoncdidmhf.png
Type: image/png
Size: 2797 bytes
Desc: not available
URL: <http://public.kitware.com/pipermail/vtkusers/attachments/20160706/d6ae4ea2/attachment.png>