Re: Gouraud Shading w/ pfMaterial

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Marcus Barnes (marcus++at++multigen.com)
Fri, 21 Mar 1997 12:24:26 -0800

On Mar 20, 4:42pm, SCOTT OFRIEL wrote:
>
> Is it possible to use Gouraud shading on a pfGeoSet, say a quad, when using a
> pfMaterial that is associated with it's pfGeostate?

Yes. The material generally gets pfMtlColorMode(
PFMTL_CMODE_AMBIENT_AND_DIFFUSE ). The geostate has lighting enabled and the
geoset has a primitive type that is not FLAT (to insire shademodel( GOURAUD )).
The geoset also has normals and per vertex colors.

> Right now I am doing Gouraud shading and assigning a color to each vertex,
but
> I would like to use transparency which requires a pfMaterial.

Transparency does not require a material. The geoset colors are RGBA colors and
the alpha component is usable; see pfMaterial(3) note:

""
For non-homogeneous transparency, use a color mode other than PFMTL_CMODE_OFF
and transparency will be taken from geometry colors.
""

The geostate must have PFSTATE_TRANSPARENCY enabled in any case.

Regards.

--
+ Marcus Barnes, Technical Staff        mailto:marcus++at++multigen.com +
+ Multigen Inc.                         http://www.multigen.com    +
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