Re: Attenuation of lights

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Sharon Clay (src++at++rose.engr.sgi.com)
Fri, 17 Apr 1998 11:25:35 -0700

+>---- On Apr 17, 3:20pm, Olivier Georg wrote:
> Subject: Attenuation of lights
->
->Hi pfAll,
->
->I am a bit confused with the attenuation of lights. It can be set for both
->a pfLightSource (in which case I suppose the three components depend on
->the source) and a pfLightModel (since it is specified for a pfGeoState,
->itself attached to a pfGeoSet, I can also suppose the components depend
->on the object which is enlighted). So... which version is correct ?

This one is actually in the pfMan pagees on pfLightModel and pfLight so I
have to bragg :-)

Attenuation on the light model is done only in IRIS GL operation.
OpenGL light attenuation is done per-light.

Per-light attenuation is only available in OpenGL.
IRIS GL light attenuation is done on the light model.

We even have a pfQueryFeature token so you can tell at run-time which
one you've got: PFQFTR_LIGHT_ATTENUATION.

src.

-- 
-----{-----{---++at++   -----{----{---++at++   -----{----{---++at++   -----{----{---++at++
Sharon Rose Clay - Silicon Graphics, Advanced Systems Dev.
src++at++sgi.com  (650) 933 - 1002  FAX: (650) 965 - 2658  MS 8U-590
-----{-----{---++at++   -----{----{---++at++   -----{----{---++at++   -----{----{---++at++





attached mail follows:
From: "Olivier Georg" 


Date: Fri, 17 Apr 1998 15:20:58 -0600


To: info-performer++at++sgi.com


Subject: Attenuation of lights


I am a bit confused with the attenuation of lights.  It can be set for both
a pfLightSource (in which case I suppose the three components depend on
the source) and a pfLightModel (since it is specified for a pfGeoState,
itself attached to a pfGeoSet, I can also suppose the components depend
on the object which is enlighted).  So... which version is correct ?


Olivier



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