FW: [vtkusers] Embedded geometry with VolumePro500 & VTK

[Martin Gardner]

Hi Ron,

Ron Inbar wrote:
> As far as I know, the VP500 can't do embedded geometry, so it surprises me
> you were able to see anything.  Did you get a three-dimensional,
> geometrically-correct result?  I guess not.

yes, and no. I can get something that resembles embedded geometry but I 
doubt it is geometrically correct.

I've looked through the source code for 'Revli' and it does embedded 
geometry by rendering N rectangular slices of the volume. OpenGL then 
takes the resulting textures and applies them to planar polygons. This 
allows other polygons to be placed between/intersecting slices and 
OpenGL deals with occlusions and gives the illusion that the polygonal 
geometry is embedded in the volume.

However this means that the VolumePro renders the volume N times just to 
display the volume once.  This causes a significant drop in the frame 
rate which I would like to avoid if possible.

So it looks as though I am going to have to wait for the VP1000 before I 
can get reasonable frame rates + correct renderings.

Cheers

Martin
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mglistmail at totalise.co.uk