Re: Flimmering

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Sharon Clay (src++at++rose.asd.sgi.com)
Wed, 14 Aug 1996 11:01:13 -0700

+>---- On Aug 14, 6:01pm, Angus Dorbie wrote:
> Subject: Re: Flimmering
->
->In the scenario below the decal2 will show through base1 & decal1 if you
->draw base1 & decal1 first. This is what I meant by "occlusion between
->decal surfaces", I didn't mean decals on the same base.

No - Base2 will write 0 to the stencil bit everywhere it fails the depth
buffer test and that will effectively "clear" the stencil bits so decal2
will not show up at all.

->
->Eye decal1 & Base1 decal2 & Base2
-> | |
-> | ||
-> | ||
-><) || ||
-> || |
-> | |
-> | |
->
->With one stencil bit this problem is unavoidable.

The only case where you get into trouble is if a decal overflows
its base because then the base cannot set all of the proper stencil
bits and the base may hit junk set by previous bases. So, decals
must lie completely within their base poygons.

src.

-- 
-----{-----{---++at++   -----{----{---++at++   -----{----{---++at++   -----{----{---++at++
Sharon Rose Clay (Fischler) - Silicon Graphics, Advanced Systems Dev.
src++at++sgi.com  (415) 933 - 1002  FAX: (415) 965 - 2658  MS 8U-590
http://www.sgi.com/Technology/Performer/
-----{-----{---++at++   -----{----{---++at++   -----{----{---++at++   -----{----{---++at++


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