Hi Allan,
On Tue, 2005-08-30 at 13:53 +0200, Allan Rasmusson wrote:
> I am not using any classes derived from DVRVolume. If one looks at
> OSGDVRVolumeBase.h you are quite right that setRenderMaterial is
> protected, but in OSGDVRVolume.h it is made public (around line 90).
> Conflict of interests...
Ack! How did that get in there?
> Okay then; instead of using the setRenderMaterial, I tried to attach
> my OSGFragmentProgramChunk to the DVRAppearance which is just a
> specialized version of the ChunkMaterial. I should mention that all
> volume rendering is setup and renderer BEFORE the fragment program is
> added. In order to add the fragment program I do:
>
> ... initialize fragment program chunk...
>
> DVRAppearancePtr app = myVolume->getAppearance();
> beginEditCP(app);
> app->addAttachment(_myFragmentProgram);
> endEditCP (app);
>
> The fragment program is completely ignored, but just after adding
> this the dbg version starts complaining:
>
> WARNING:
> (/users/alras/code/OpenSG/Source/System/State/OSGTextureChunk.cpp,1907):
> TextureChunk::deactivate precheck failed: invalid enumerant (0x500)
>
> Hm... Does all this mean that the only way to render the vol. rend.
> using a fragment program is to write a custom shader?
Honestly, that was the idea. The Slicer can be used for simple things,
like using an arbitrary Material on a 3D texture, and the VolRen
Framework was for more complicated shaders that need bricking,
precalculated gradients etc. It would be possible to write a
MaterialShader that just takes a Material and uses that to render the
Volume, but we don't have that yet.
> I haven't had time to do a test program, but should be able to do so in
> a day or two.
Great, thanks.
> Do you plan to remove the enable/disable feature from the clipPlane? I
> ask because I may have 4 or 5 clipPlanes attached to several graphs, and
> allow the user to choose which ones are enabled for each graph.
I was planning to do that. Now I need to think about a good way for you
to keep your system working. Hmm...
Yours
Dirk
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