Re: some problems about mgflt14.1 and spotlight

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Angus Dorbie (dorbie++at++multipass)
Wed, 24 Dec 1997 13:43:36 -0800

On Dec 24, 11:24am, flysiml++at++public.bta.net.cn wrote:
> Subject: some problems about mgflt14.1 and spotlight
> Hello pfFriends,
>
> merry christmas and happy newyear .
>
> I use mgflt14.1 to build scene and fly it on pf2.x. In the scene
> there are polygons with only base texture, but scene loader reports
> that "polygon p#### missing detail texture index". But if I use pf1.2
> to fly the same scene, all are ok.
>
> I add spotlight to perfly2.2 and it works. But there are 2 problems:
> If I use OpenGL, the scene will not be dark enough when the time of
> day is set to zero. If I use IrisGL, the scene can be dark but also
> the spotloght is dark when the time of day is zero.
>

This is the spotlight support in performer. The time of day is a
higher level concept specific to perfly. If you consider what you
are doing you are specifying a scene illumination and using
projective texture to darken the scene. When you change time of
day you are darkening the lighting level within the illumination
lobe. To do the right thing you'd at least want to point your
light source down the vector of the illumination lobe.

Performer 2.2 should make all of this more functional and more
consistent.

Cheers,Angus.

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