On 20/01/2018 17:37, Kenneth wrote:
> It occurs to me that there is another major use for this cubic pattern: as a
> 'cubic' environnment map. (Maybe that was the original reason for its creation?)
> 
> Fot distant environmment maps that envelop a scene--as for radiosity use or
> reflections-- I always use a sphere or hemisphere as the object, with a texture
> or suitable photograph on it. But 'cubic'-shaped maps can also be used. (I've
> never worked with computer games or GPU processing, but it looks like cubic maps
> are the main technique used there, not spherical maps.) One of the reasons seems
> to be that a cubic map makes better use of the texture's pixels-- less
> distortion when mapping the original texture onto the cube faces vs. the inner
> surface of a sphere.
> 
> I came across an old Paul Bourke article that explains it better...
> 
> http://paulbourke.net/miscellaneous/cubemaps/
> 
> 
> 
> 

Worked out from first principles. Impressive. :-)

Have a look at this site.
http://www.pauldebevec.com/Probes/

And scroll down to:
Probes in the Vertical Cross Cube Format



-- 

Regards
     Stephen

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