Am 03.04.2013 01:17, schrieb Christian Froeschlin:
> 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.

Not exactly: In "#version 3.7" mode, if a ray does not hit an object the 
pixel is coloured as specified by the background colour; if that is 
transparent, then the pixel will be transparent (given that you use +ua).

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