Hi Yefei,
> Am I really reduced to modifying the core of OSG to add
> uniforms and set their values whenever a relevant GL call is being
> made?
To add to what Mike and Leif said, you don't have to modify OSG. You
could just write a visitor that does what you want, i.e. traverse the
graph, checking for the state you need to set uniforms for, and then
applying them. The same visitor could accumulate state from the root and
when reaching a leaf node (geode), apply the right shader for the
accumulated state.
With a bit of work you can get a solution that's pretty general and
works well, and which is also pretty optimal.
Hope this helps,
J-S
--
______________________________________________________
Jean-Sebastien Guay [EMAIL PROTECTED]
http://www.cm-labs.com/
http://whitestar02.webhop.org/
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