restricting PROJTEX pfLightSource to subset of scene?

New Message Reply Date view Thread view Subject view Author view

Daniel Williams (dwilliams++at++sarnoff.com)
Mon, 12 Oct 1998 09:48:33 -0400

I'd like to restrict the influence of several projected texture
pfLightSources to a small portion of my scene graph. The manual page
for pfLightSource says:

    If you want light sources to affect only portions of the scene,
    then set one or more pfLights on the pfGeoStates which are
    attached to the pfGeoSets that you wish to illuminate (see
    pfGeoState::setAttr and PFSTATE_LIGHTS for further details).

The manual page for pfGeoState says:

    If attr is PFSTATE_LIGHTS, a should be an array of pfLight* of
    length PF_MAX_LIGHTS which specifies which pfLights should be used
    by the pfGeoState. Empty entries in the light array should be NULL.

It doesn't seem that this advice applies to projected textures (nor
indeed to pfLightSources in general, unless one subclasses
pfLightSource and adds a method to return the protected pfLight*
member.) Is the documentation in error?

Has anyone been successful at this, short of coding their own version
of Performer's multipass algorithm?

Thanks,
Dan

--
Daniel Williams, Systems & Scientific Software
Voice: (215) 885-1573 Email: sass++at++acm.com
Independent Consultant to: Sarnoff Corporation
Voice: (609) 734-2153 Email: dwilliams++at++sarnoff.com

New Message Reply Date view Thread view Subject view Author view

This archive was generated by hypermail 2.0b2 on Mon Oct 12 1998 - 06:48:38 PDT

This message has been cleansed for anti-spam protection. Replace '++at++' in any mail addresses with the '@' symbol.