Hello Alexander,
On 09/18/2012 07:56 AM, Alexander Lang wrote:
> with your help i have created an OpenSG Stage core that provides
> Order-Independent Transparency via the Depth Peeling algorithm as
> described in
> http://developer.download.nvidia.com/SDK/10/opengl/src/dual_depth_peeling/doc/DualDepthPeeling.pdf
> . The implementation is based on the code that can be downloaded here:
> http://developer.download.nvidia.com/SDK/10/opengl/samples.html.
>
> I think OpenSG would benefit from the integration of this core. The code
> is ready for your review and can be found at
> http://www.cip.ifi.lmu.de/~langal/osg_depthpeel.zip
> The project contains the code that compiles to a library which is used by
> a simple OpenSG test application (Screenshot:
> http://www.cip.ifi.lmu.de/~langal/osgdp.jpg ).
thank you very much for the contribution! I haven't looked at the code
yet, hoping to get a chance to do so within the week.
Having a depth peeling implementation (or other OIT technique for that
matter) is something I wanted to have in OpenSG for a long time, but it
never quite managed to make it to the top of the todo list :(
> A user should specify the number of passes and the texture unit he or she
> does not use otherwise. Unfortunately, the core is not self-contained,
> i.e. the user has to integrate the depth test shader code into his or her
> shader and probably cannot be combined with other stage cores. But so far
> as i am aware the other stages like DeferredShading have the same
> limitation, so i guess this is not a problem.
yea, it's my pet peeve with shaders in libraries: certain features can
not be provided in a non-intrusive way, user-written shaders have to be
aware of them.
> I also have not tested the code on older machines.
Could you give us an idea what hardware generation or OpenGL extensions
are required?
> The DepthPeelingStage implements only the simplest front-to-back peeling
> technique, therefore requiring n passes for n depth layers, but should
> form a basis for more advanced techniques like Dual Depth Peeling.
yup, thanks again for the contribution!
Cheers,
Carsten
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