I've got a few skies made with Infinite for sale in the marketplace ;)

Point is, since .hdr files are High Dynamic Range, they contain true brightness values of an image, not just the colours. Thus they can be used as a light SOURCE.

ie, if a patch of sky has a brightness of say 1,000 and the area near sun has 32,000, and an area of cloud is 400, all those light areas are prjected down onto the model area, as real sky does, thus giving true lighing.

http://www.renderosity.com/viewed.ez?galleryid=1211952&Start=1&Artist=silverblade33&ByArtist=Yes

that was made using an hdr I made of the scene's actual sky, then reimport the hdr, use that for lighting, I find it gives better, faster effect than rendering with GI

:)

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