Speed problems

[Nils Holger Busch]

Hello,

I am encountering severe speed problems using vtk . In my app code I
read in a 160^2*200 volume and try to render three orthogonal slices
like in the medical example. However, vtk takes a lot of time to even
display(several minutes) the slices and it is almost impossible to
interact (transform the viewpoint) with the data. Can anyone explain
that behaviour? Is this normal?

The program takes about 56Mb of main memory. I am running it on an SGI
O2 under Irix6.5. The machine is an older one with only 160 Mb of main
memory, but still the performance is disappointing. Running it on an
Octane does not speed things up significantly.

The examples don't run any faster overall, so I don't think the main
problem is with my code.

Is there some problem with the OpenGl driver? Any hints, suggestions?

Does anyone know how vtk compares in speed to pure OpenGL Code,
OpenGLOptimizer, OpenInventor or complete  visualization programs like
OpenDX from IBM? If this is no heresy to ask on a vtk list.

Thanks for any suggestions.

--
Best regards,
                                         Nils H. Busch

======================================================
=== Max-Planck-Institute of Cognitive Neuroscience ===
=== Phone:                     ++49 (341) 9940-234 ===
=== Fax:                       ++49 (341) 9940-221 ===
=== E-Mail:                       nilsb at cns.mpg.de ===
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