LOD and Texture mapping

[Enrico Simonotto]

Hi,

I have been trying to use a LOD in a volume rendering
application. This works fine if I use ray tracing; I noticed
a problem when I use texture mapping: if the volume has been
rendered with texture mapping and I now try to render it
on orthogonal planes, like in the volSimpleLOD.tcl example,
the transparency of the planes is ignored. I regret that I haven't
been able to find a fix for this and I can only include,
at the end of the message, a diff file to modify volSimpleLOD.tcl
to use volume texture mapping (as the level 3 of the LOD) and
replicate the problem.
I'm using a recent night release (199/11/15) on Solaris 2.6,
SUN OpenGL 1.2, compiled with SUN C++ v. 4.1 and SUN C v. 4.0.

Thanks in advance for any suggestion/help.
Enrico

----------
diff -d volSimpleLOD.tcl  volSimpleLOD.1.tcl
0a1
> 
104c105
<       -length 150 -from 0.05 -to 1.0 -resolution 0.05 \
---
>       -length 150 -from 0.05 -to 5.0 -resolution 0.05 \
149a151,153
> vtkVolumeTextureMapper2D volumeMapper1
> #volumeMapper1 SetGradientEstimator gradest
> volumeMapper1 SetInput [reader GetOutput]
238,240c242,248
< set level3 [lod AddLOD probeMapper_hres probeProperty 0.0]
< set level4 [lod AddLOD probeMapper_lres probeProperty 0.0]
< set level5 [lod AddLOD outlineMapper outlineProperty 0.0]
---
> set level3 [lod AddLOD volumeMapper1 volumeProperty 0.0]
> set level4 [lod AddLOD probeMapper_hres probeProperty 0.0]
> set level5 [lod AddLOD probeMapper_lres probeProperty 0.0]
> 
> #set level3 [lod AddLOD probeMapper_hres probeProperty 0.0]
> #set level4 [lod AddLOD probeMapper_lres probeProperty 0.0]
> #set level5 [lod AddLOD outlineMapper outlineProperty 0.0]



-----------------------------------------------------------------------------
This is the private VTK discussion list.  Please keep messages on-topic.
Check the FAQ at: <http://www.automatrix.com/cgi-bin/vtkfaq>
To UNSUBSCRIBE, send message body containing "unsubscribe vtkusers" to
<majordomo at gsao.med.ge.com>.  For help, send message body containing
"info vtkusers" to the same address.     Live long and prosper.
-----------------------------------------------------------------------------