[vtkusers] Any alternative to vtkUnstructuredGridVolumeRayCastMapper

[jiksed]

Hi vtkusers,
 
I have a 3D volume data in an unstructured grid with irregular surface topography. My first
 instinct is to use vtkUnstructuredGridVolumeRayCastMapper to do the volume rendering. The
 problem is that this volume mapper is extremely slow and the wireframe-type mesh is visible 
in the volume image (please see the attachment). My questions would be:
 
1) Is there any way to speed it up? 
2) How can I make the image more smooth without showing the underline wireframe?
3) Is there any alternative to vtkUnstructuredGridVolumeRayCastMapper? I really need an 
ImageData so I may manipulate the volume opacity and use the ImagePlaneWidget.
 
One way I can think of is to use vtkShepardMethod to transform vtkUnstructuredGrid into 
vtkImageData in a rectangular box. My data is inside an irregular volume like human head. 
Now how do I "get rid of" excessive volume to expose my irregular surface topography? How 
do I manipulate the output of vtkShepardMethod? By setting a small MaximumDistance, some 
points may end up with NullValues but not those points close to the outer surface of my data 
volume. I am kind of lost here. 
 
Thank you for any suggestions.






		
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