Hi Terry,
On Mon, 2005-11-07 at 14:00 -0600, Terry Welsh wrote:
> I have been flattening objects in a scene and finding that my bump
> mapping looks wrong. It turns out that using MergeGraphOp transforms
> all my normals, but it won't transform anything stored is secondary
> colors. I'm using secondary colors to store all my binormals, and
> using those in a shader that does my bump mapping.
>
> Is there any way to have MergeGraphOp affect secondary colors or
> texture coords the same way it affects normals? Or would this be an
> easy enough feature to add to OpenSG?
Hm, that's non-trivial, because there is no way to find out whether a
texture coordinate is just a texture coordinate or a tangent/binormal.
Especially since it can change from object to object, I don't see a way
to automate that. You would have to pass it into the GraphOp as explicit
parameters.
You can extend the MergeGraphOp to affect specific texcoords if you want
to, but I'm currently not aware of anybody working on this. Any takers?
Dirk
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