Bill Pragnell wrote:
> "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.
> 

thats's right

> 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 you are confusing things here a little. What you call spherical 
projection is named angular projection (as used for so called light 
probes) and those 'probes' are different to mirror ball photographs 
because they are already post processed and corrected for the outer 
distortion of mirror ball photos. So the 'Uffizi' - and the well known
'Kitchen' - probe are directly usable with MegaPov's map_type 7.
Mirror ball photos have to be processed with some external tool.

-Ive

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