Re: Shading

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Ran Yakir (rany++at++++at++sgi.com)
Thu, 21 Aug 1997 09:24:54 +0000

On Aug 20, 2:59pm, Sasikumar Kutti wrote:
> Subject: Shading
> Hi
>
> I am having a trouble with getting smooth shaded models.
>
> I imported a Multigen flight model in 'trackball.c'. It looks badly
> shaded. So I inserted the following lines in the code
>
>
> pfShadeModel( PFSM_GOURAUD);
>
> pfOverride(PFSTATE_SHADEMODEL, PF_ON);
>
>
>
> Further the model doesn't look different even if change to flat shading.
>
> The model looks good in Multigen so I guess there is little chance that
> it has very few polygons.
>

The problem is not the shading mode, but the normals. You propobaly have one
normal per polygon, which results in a 'faceted' shading. To have smooth
shading, each vertex should have its own normal. If several vertices are having
the same location they should share the same normal value.

Ran

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