Re: problem with normals

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Brian Furtaw (brian++at++sgi.com)
Thu, 27 Feb 1997 09:50:59 -0500

You need to make a change to the pfGeoState attributes you defined below. Look
at the ENLIGHTING attribute you have it turned off which means flat shade this
object, you need it to be on.

On Feb 27, 9:01am, Yann Andenmatten wrote:
> Subject: problem with normals
> Hi,
>
> I've create an object (a cylinder) without texture, but with colors. The
> problem is that the object is colored with the colors, but it ignores the
> light...
> What am I missing ?
>
> The code is like this :
>
>
> pfGeoSet* cylGeoSet = new(arena) pfGeoSet;
>
> cylGeoSet->setAttr(PFGS_COORD3, PFGS_PER_VERTEX, cylPts, indexPts);
> cylGeoSet->setAttr(PFGS_NORMAL3, PFGS_PER_PRIM, cylNormals, indexNormals);
> cylGeoSet->setAttr(PFGS_COLOR4, PFGS_PER_VERTEX, cylColors, indexColors);
> cylGeoSet->setAttr(PFGS_TEXCOORD2, PFGS_OFF, cylPts, indexPts);
>
> // the total number of triangles
> cylGeoSet->setNumPrims(2*(nbPtsHeight-1)*2*nbPtsCircle);
> cylGeoSet->setPrimType(PFGS_TRIS);
>
> // set the pfGeoState and the pfGeoSet
> gstate = new(arena) pfGeoState;
> gstate->setMode(PFSTATE_CULLFACE, PFCF_OFF);

> gstate->setMode(PFSTATE_ENLIGHTING, PFTR_OFF);

        gstate->setMode(PFSTATE_ENLIGHTING, PFTR_ON);

> gstate->setMode(PFSTATE_TRANSPARENCY, PFTR_OFF);
> gstate->setMode(PFSTATE_ENTEXTURE, PFTR_OFF);
> gstate->setMode(PFSTATE_ENHIGHLIGHTING,PFTR_OFF);
> gstate->setMode(PFSTATE_ENWIREFRAME, PFTR_OFF);
>
> cylGeoSet->setGState(gstate);
>
> Thanks for help !
>
> Yann
>
> PS : I've an other object in the scene (that is create form a file and is
> textured) and it uses the light.
>
> --
> ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> [][][] [][] [][][] [] > Ecole Polytechnique Federale de Lausanne
> [] [] [] [] [] > Swiss Federal Institute of Technology
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> [] [] [] [] > Yann Andenmatten, +41.22 693.58.50
> [][][] [] [] [][][] > yandenmat++at++di.epfl.ch
> ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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>-- End of excerpt from Yann Andenmatten

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Brian Furtaw  (brian++at++sgi.com)	
VisSim  Technical  Consultant
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