In article <3aacf1b7$1@news.povray.org>, "Mael" <Mae### [at] hotmailcom> 
wrote:

> i ve seen you used the depth information in your stars post process, 
> but here i would like to see the "background_pigment" given by the 
> user through transparent objects (by blending(not sure this is the 
> term in english?) rgb of the specified pigment with the rgb of the 
> object)

I see...well, it might work, but remember that it won't be correct with 
refracting surfaces, and it still won't work for reflections.


> i thought the channel filter (or transmit) could be used for that, but it
> doesn t seem to work as i expected :(

Well, remember that alpha is the opposite of transmit...if you were 
checking for non-0 values, you were checking for any values that 
*weren't* completely transparent. With alpha, 0 is completely 
transparent and 1 is completely opaque.
And from the documentation, it looks like POV uses the transmit channel 
to get alpha information...post_process data may be the same.

-- 
Christopher James Huff
Personal: chr### [at] maccom, http://homepage.mac.com/chrishuff/
TAG: chr### [at] tagpovrayorg, http://tag.povray.org/

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