dona_ferentes opened this issue on Jun 14, 2005 ยท 15 posts
face_off posted Tue, 14 June 2005 at 4:43 PM
Attached Link: http://www.users.on.net/~pkinnane/P6RealismKitNews.html
Morphy.... It all depends how realistic you want to get.... In general, a scene lit entirely from an IBL image will lack realism due to the lack of specular lighting and the "heaviness" of IBL AO shadows. I've found the best method to get around this is to use infinite lights for the majority of the scene lighting, and use IBL as a filler light. You can generate the infinite lights from an IBL image, although it's not for the faint hearted - see the tutorial in the link above. Alternatively, you can "guess" the light positions and strengths (which I've done on a heap of my renders and is suprisingly good!). The method described in the link above has been superceded by something I think works a lot better (which is what Richardson was referring to), and involves a neat trick in the material room on the ibl light to "carve off" the bright lights, and replace them with infinites. Again, it's not for the faint-hearted. I've been waiting for "stewer approval" (which has now been given) to make available a modified version of his poor-mans's IBL script before releasing the tutorial. IBL Image source and background image....If you are illuminating the scene purely from an IBL light + image, to get a matching background rotate your scene and camera 180 degrees in the Y Axis and use the middle of the IBL image as the background image. That way the scene lighting will match the background image. To "uncurve" the background image, feed the IBL image source into HDRShop (a free PC app), and do a [Image][Panorama][Panoramic Transformations]..convert from LightBall to Angular Map.Creator of PoserPhysics
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