On Tue, 26 Sep 2000 22:09:14 +0300, Peter Popov wrote:
>On Sun, 24 Sep 2000 22:19:02 +0200, "Rune" <run### [at] inamecom>
>wrote:
>
>>"PoD" wrote:
>>> At the edges of objects the rgb values of the object are AAed
>>> with the background colour.  When I turn on transparency, it's
>>> because I want the background to represent _nothing_, how can
>>> nothing have a colour?  There should be no leftovers to remove.
>>
>>Exactly. The background presence should be stored in the alpha
>>channel only. Not in the red, green and blue components.
>
>So, when anti-aliasing, how should POV treat rays that hit the
>background? Ignore them?

No, average them in as pure alpha.  Rune has the right idea.

-- 
Ron Parker   http://www2.fwi.com/~parkerr/traces.html
My opinions.  Mine.  Not anyone else's.
Proudly not helping RIAA and SDMI steal my rights -- 
  http://www.eff.org/Misc/EFF/Newsletters/EFFector/HTML/effect13.08.html

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