I think you should talk to Ornlu, the master of simulated HDRI without the need of radials. You can also search for past topics in this forum regarding "HDRI" or "radiosity". The most recent ones: http://www.renderosity.com/messages.ez?ForumID=107&Form.ShowMessage=1554658 http://www.renderosity.com/messages.ez?ForumID=107&Form.ShowMessage=1553996 and another: http://www.renderosity.com/messages.ez?ForumID=107&Form.ShowMessage=1553513&Reply=1553609#6