nimda wrote:

> And how would that be done?

there is a command line option for this, +ua IIRC (and it needs to
be used with an output file type that supports transparency such as
png +fn). Basically if a ray does not hit an object (would render
with "background" color) it is considered transparent.

Regarding sprites you may also be interested in this thread

http://news.povray.org/povray.binaries.images/thread/%3C4a28f56d%241%40news.povray.org%3E

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