Am 26.01.2015 um 09:23 schrieb Mr:

> as listed here and in the Blender interface,the default is a cube,
>
> http://wiki.blender.org/index.php/Doc:2.6/Manual/World/Background#Textures
>
> "Blender can use an 2D image which it maps to a very large Box or sphere which
> encompasses the entire scene"

There's nothing in that sentence (nor anywhere else on that page for 
that matter) saying that the default is a cube; it explicitly says "Box 
or sphere".

Again, my suggestion is to post an environment map as used by Blender, 
to have a closer look at the mapping.

> Here is the function translating the map type:
>
>      elif wts.texture_coords == 'ANGMAP':
>          image_mapBG = " map_type 1 "

That's probably wrong. I suspect the AngMap type is a mapping of the 
kind made popular by Paul Devebec, as seen here:

http://www.pauldebevec.com/Probes/

AFAIK this should correspond to POV-Ray's "fisheye angle 360" camera 
projection.

Speaking of Paul Devebec's light probes page, if Blender's default 
mapping is indeed a cubic one, chances are it matches the "Vertical 
Cross Cube Format" also shown on Paul Devebec's page.

POV-Ray currently does not provide a map_type for eiter of Paul 
Devebec's mappings (yet). I do concede that this is a pity, and I'm 
inclined to tackle it soon.

As for map_type 1, that one probably corresponds to Blender's "sphere" 
mapping, possibly with rotation about the Y-axis and/or mirroring.

>      elif wts.texture_coords == 'TUBE':
>          image_mapBG = " map_type 2 "

That might also be wrong. map_type 2 cannot be reasonably used on sky 
spheres, that's for sure; it corresponds to a "cylinder 3" camera 
projection, while Blender is more likely to use a mapping corresponding 
to a "cylinder 1" camera projection.

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