Hi, J-S, Mike, Leif,
Thanks for the replies. J-S, using the node visitor indeed seems
like the best solution. I'll try that out for sure.
Cheers,
Yefei
> -----Original Message-----
> From: [EMAIL PROTECTED] [mailto:osg-users-
> [EMAIL PROTECTED] On Behalf Of Jean-Sébastien Guay
> Sent: Tuesday, April 08, 2008 7:39 AM
> To: OpenSceneGraph Users
> Subject: Re: [osg-users] Shader question concerning GL_LIGHTING etc.
>
> 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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