OTOY Forums

Radiance have you seen this before and considered it's feasability in Octane. It is a setup for HDR which contains the definitions for sun position and colour data to enhance HDR's. It looks like it could be very beneficial. There is a growing library of sIBL (HDR) sets to download and everything to make custom ones is provided.
http://www.hdrlabs.com/sibl/how_it_works.html