Hello Carsten,
2009/10/28 Carsten Neumann
> Hello Constantin,
>
> Constantin Müller wrote:
> > I read the mails to the topic, because I have a similar problem.
> > The problem is, that I have texture on the graphics card that I don't
> > want to copy back to the working memory.
> > Now I want to put this texture onto an Object in the scene.
> >
> > I work with OpenSG 2.0 and I have to say I have not much knowledge about
> > the FBOViewport, or how the stuff with the TextureChunk should work.
>
> hm, the SimpleTextureMaterial is really only for simple cases and yours
> does not quite qualify as simple any more ;)
> OpenSG splits the OpenGL state into parts (called StateChunks). A
> Material then often just becomes a bunch of chunks (e.g. a MaterialChunk
> for the OpenGL material description, a TextureObjChunk to hold the
> texture and a TextureEnvChunk to describe how the texture applies to the
> geometry), so most materials you encounter are actually of type
> ChunkMaterial.
> For the case above where you have a texture on the GPU already and just
> want to use it from OpenSG, create a ChunkMaterial and add a
> TextureObjRefChunk (with the GLid field set to the id of the texture),
> you may also want to add a MaterialChunk to set material properties for
> lighting and a TextureEnvChunk.
>
>
This sounds good for me and I will give it a try tomorrow.
> I'm trying to use the getGLID() functions one of you mentioned, but I
> > got some problems with it.
> > My approach is to create the OSG::Geometry with any Texture with
> > OSG::Material and OSG::SimpleTexturedMaterial.
> > Then I want to get the GLID() of the Texture and change this on the GPU
> > with OpenGL commands.
> > But how can I get access to the GLID() from the SimpleTexturedMaterial?
>
> ok, here I'm afraid you lost me a little. Are you describing here how
> you create the texture you want to change on the GPU in the first place?
> My explanation above was about what to do if you have the GL id of a
> texture (one that is created outside of OpenSG) and want to render some
> OpenSG geometry with it.
> If you want to use a texture in multiple places you can add the same
> TextureObjChunk to multiple materials.
>
>
The first part of the question was how I could include an existing GLObject
into OpenSG.
This part was sort of the other way around.
Here the idea was to create an OpenSG Object and Texture and modify the
texture by getting the GLID of OpenSG and use this with OpenGL.
> I'm not sure if this answers your question, if not could you please
> provide some more details on how you create the texture (using OpenSG or
> externally?), how you modify it on the GPU (do you use it as a render
> target of an FBO?) and what you want to apply it to (OpenSG geometry?).
>
>
I will try your suggestion and give you a response.
Thanks, so far,
Constantin
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