[vtkusers] volume rendering large data

[Budd Hirons]

Hi Felix,

Firstly you can resample ( vtkImageResample, vtkImageShrink3D ) the dataset 
down, this may depend on whether or not you really need to see everything 
at full scale when you are looking at the entire dataset.
After rendering a subsampled complete dataset, you could then extract 
regions of interest ( vtkImageThreshold, vtkExtractVOI, vtkImageReslice ) 
and render those at full scale.
Secondly, you can render it with texturemapping (vtkVolumeTextureMapper2D) 
instead of raycasting (vtkVolumeRayCastMapper), this will get you a bit 
more performance on the interaction/rendering.

Also, you can degrade the precision of the rendering if you are bogging 
down you machine by changing the number of texture planes actually rendered:
vtkVolumeTextureMapper2D->SetMaximumNumberOfPlanes( 20 );
or ray casting sampling:
vtkVolumeRayCastMapper->SetImageSampleDistance( 2.0 );

Budd.

At 05:01 PM 5/16/2003 +0200, you wrote:
>i'm having micro-CT data that is pretty large (100 MB).
>has anyone information or some hints on how to best
>render such large data on an average workstation unsing vtk?
>(2GHz, 1GB RAM, Geforce4)
>
>TIA,
>felix schwenk
>
>_______________________________________________
>This is the private VTK discussion list.
>Please keep messages on-topic. Check the FAQ at: 
><http://public.kitware.com/cgi-bin/vtkfaq>
>Follow this link to subscribe/unsubscribe:
>http://public.kitware.com/mailman/listinfo/vtkusers
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://www.vtk.org/pipermail/vtkusers/attachments/20030516/a42bc363/attachment.htm>