1. Place one light in the scene and turn it off if you do not like to use any additional lights with IBL. Bypassing this procedure will lead to the installation of default lights even if you answered NO in the warning message.
2. You must use the "Render Scene Environment" and assign an appropriate image to the Global Environment as well as select Environment in the Background tab.
3. For Image Based Lighting to work, you must create a global Luminance in the "Render Scene Luminance" and set it to Simple Environment. If a scene has Global Environment set, then "simple environment" "forces" the environment to shine, and controls its luminosity. It does not matter, on which format (HDRI or LDRI) Global Environment is built, but HDRI is still presumed the main one. (Vlad Veselov)
As for shadows in IBL, please see Vlad's Q&A page!He's got great advice.
That's it for the very basics of it. Render the scene in RTF and have fun!
Good luck and happy rendering!
Sincerely Alfred
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