> I was thinking of rendering scene with only sky_skyspere (and/or other
> elements so far that they can be considered as background) and then using
> sky_sphere with image_map.


Good thinking.

> What camera type ue when pre-computing, and what mapping use when fast
> rendering later?


Spherical camera, spherical mapping. Note that they work slightly
differently so if you want it to match up exactly, you'll have to do some
rotating and negative scaling of the image map.

 - Slime
 [ http://www.slimeland.com/ ]

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