Hello Charly,
charly 7 wrote:
> Hi all,
> I've created a small OpenSG application to apply a shader to my OpenSG
> particles system. But I've a problem. I don't know how I can pass an
> attribute variable to shader.
> I use a setUniformParameter() to pass uniform variables but I can't
> found some function that allows me to pass also Attribute Parameters.
> Can somebody help me?
AFAIK in OpenSG 1.8.0 there is no direct support for this available, as
it requires changes to how geometry attributes (i.e. properties in
OpenSG terminology) are handled. I believe the common workaround is to
use otherwise unused texture coordinate properties to carry this
information.
I think the test program
Source/System/NodeCores/Drawable/Particles/testParticlesRenderShader.cpp
uses this trick.
Hope it helps,
Carsten
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