Shadows in Performer 2.0

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Tomas Moller (tompa++at++clarus.se)
Fri, 1 Mar 1996 10:02:13 +0100

Hello!

I have managed to set up a scene lit by a pfLightSource that cast shadows and I
have a few questions.

1) My shadows are all black. Is it possible to generate shadows with
   transparency so that the object's color on which the shadow is cast will
   be seen through the shadow?

2) You could set the PFLS_SHADOW_DISPLACE_OFFSET and PFLS_SHADOW_DISPLACE_SCALE
   for the pfLightSource but I have not found any explanation on these.
   I guess the OFFSET is to be used to avoid self-shadowing. What is the SCALE-
   parameter to be used for and what exactly to these parameters do?

3) I also have a problem with transparency. My shadowed model includes a few
   surfaces that are transparent, but when I turn on the shadows the
   transparency disappears. Anyone had similar problems?

4) The man page says that "shadows and projected textures are not clipped or
    properly computed behind a pfLightSource. Instead, geometry behind the
    pfLightSource will be textured randomly."
    Will surfaces that are outside the frustum of the pfLighSource but in front
    of the pfLightSource also be "randomly textured"? At least mine are.
    Is it possible to set for example PFTEX_CLAMP or anything to avoid this
    effect?

Thanks,
Tomas

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