Shade model problem

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Lionel Maiaux (maiaux++at++platine.corys.fr)
Tue, 23 Jul 1996 10:09:19 -0600

Hi,

I work on an iR with Performer 2.1 and I have a problem with gouraud shading.

I have several coplanar quads (each on a diferent geoset with OVERALL normal)
and a local light above them but lighting is not interpolated on the quads.

I read the pfGeoSet/pfShadeModel man pages and I tried several things ...
- verify the PFGS_FLATSHADE of my geosets (0),
- attach a NULL geostate to my geosets and call pfShadeModel(PFSM_GOURAUD) just
before drawing my geosets (pfDrawGSet),
- attach a geostate which inherit the global state and call
pfShadeModel(PFSM_GOURAUD) to affect it (but I suppose it's the default),

... without results !!!

With ogldebug, I always see a glShadeModel(GL_FLAT) openGL call, when I draw my
geosets but I don't know why.

When I modify the normal binding OVERALL to PER_VERTEX, I obtain gouraud
shading but I suppose I should do it only for non-equal normals, right ?

Thanks for your help !
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