in news:3cbc6874$1@news.povray.org Gilles Tran wrote:

> Maybe I didn't look hard enough, but the docs don't explain a lot
> about the +UA switch and how the alpha output is controlled by the
> absence of background.

http://news.povray.org/3ba0c3e3@news.povray.org
http://news.povray.org/3be2578b@news.povray.org

if these are about what you mean, I'll add it to the docs.

Ingo

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