[vtkusers] Update: White image with dri volume rendering

[l.a.h.j.d.graaf at tue.nl]

Dear Lisa,

I don't understand why the raycaster uses texture mapping.
I thought ray casting begins at the back of the volume and works its way 
up to the front adding intensity depending on the material it 'sees'.

I think I'm using 4.1.1. How can I check that ?

I've tried ImageInteractor.tcl and it works, fast :-)


Regards,

Larry


*****************************************************************

 At 03:41 PM 11/25/2002, l.a.h.j.d.graaf at tue.nl wrote:
>For you who are curious,
>When running volSimpleLOD.tcl the same symptoms appear namely a white
>image with levels 1 and 2 of the lodProp3D. These are raycast mappers.
>So it seems nothing to do with textures. What is correct in respect of
>the mesa textures demo's who are running correctly.
>It remains a mystery to me...
>By the way I use a G400Max.
>
>Larry
>
>
>***** previous mail ****************************************
>Dear vtkusers,
>
>When using vtkOpenGLVolumeTextureMapper2D to render a volume I get a
>white image with DRI enabled. Without DRI the image is correct although
>very slow.
>The Mesa opengl demos do work with DRI enabled. So it looks like a
>problem with the texture mapper.
>I've read several messages about problems with texture mapping and DRI
>but none with the same problem.
>
>Anyone some suggestions ?
>
>I'm using vtk 4.0 (or 4.1 I don't know how to check that)
>xserver-xfree86 4.1.0-16, kernel 2.4.18, debian woody, mga.o and
>mga_dri.so from Matrox.
>
>
>Thanks,
>
>
>Larry