"Thomas de Groot" <tDOTdegroot@interDOTnlANOTHERDOTnet> wrote:
> The scenes rendered with map_type 7 are clearly different. So, in what
> situations is this particular parameter used? The documentation is unclear
> about this.

It depends on the shape of the light probe. If you have a lat-long projection,
like this:

http://www.trinity3d.com/media/dosch_design/dosch_hdri/City_At_Night/example2.jpg

....you use map_type 1, in which the top and bottom rows of the image correspond
to the north and south poles of the sphere.

If, however, you use spherical projections (i.e., as photographed from mirror
balls), such as this:

http://gl.ict.usc.edu/HDRShop/tutorial/images/uffizi_probe.jpg

....you need the map_type 7, which the standard pov 3.6 doesn't support.

I think (but have never tried) you can set up the povray camera to produce
either projection if you're generating your own probe.

Bill

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