Lance R. Marrou (marrou++at++vsl.ist.ucf.edu)
Mon, 27 Mar 1995 12:52:05 -0500 (EST)
>
> >>On Fri, 24 Mar 1995, Henrik Lind wrote:
>
> >> I want to display a texture map which is always bright, even when the
> >> surroundings are dark. That is, I want it to ignore surrounding
> >> lighting and be `self-luminous'.
> >>
> >> How do I do this?
>
> >Turn off lighting for the geostate:
> > pfGStateMode( gstate, PFSTATE_ENLIGHTING, PF_OFF );
>
> Or, you can set the texture environment to DECAL mode (I think I got
> that right - I'm at home and my code is at work - Lance can correct me
> if that's slightly off) :)
It also depends on the desired visualization. I sometimes use modulation of
the material colors on a grayscale camouflage texture. Using DECAL mode will
mess things up for that case.
>
> I use lighting when I want to turn the texture on and off during
> run-time; decal-mode if the texture is always on. I don't know if there
> is a performance difference.
I think it is a small difference, but I would hazard a guess that switching
texture environment mode is slower than switching between lighting and
non-lighting.
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