> HDRI_test1 uses a map generated with MegaPOV 1.2.1. From top to bottom, this 
> was rendered with MegaPOV map_type 1; MegaPOV map_type 7; and finally with 
> version 3.7 beta 32.
> 
> HDRI_test2 uses a map from a hdri collection, and was rendered identically 
> with megapov and 3.7.
> 
> 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 all depends on the map you're using... in both of your tests, the HDRI 
used seems to be equirectangular, so this is why map_type 1 works, and 
map_type 7 doesn't because it was designed for another type of projection. I 
don't recall how it's named, but there was a recent post by clipka 
explaining just this and other interesting facts about the different 
projection types used for HDRI.

--
Jaime

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