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1cs426-winter-2008 Notes RenderMan tutorial now on web site too More papers to read when you can: Hanrahan and Lawson, “A language for shading and lighting calculations”, SIGGRAPH ’90 Paul Debevec, “Rendering synthetic objects into real scenes…”, SIGGRAPH ‘98
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2cs426-winter-2008 Differential Rendering For adding CG shadows in a real scene Put in rough estimate of true scene geometry, colour, material etc. Render rough estimate once without CG object, once with CG object shadow (NOT the object itself): Difference is shadow (or caustics, …) Composite onto real scene (addition) Then render CG object alone Composite “atop”
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3cs426-winter-2008 Image-based lighting For getting CG lights just right or environment map for reflections Take high-dynamic range (HDR) image of silver ball Two images are better… Do the math to get the environment map Becoming standard procedure on movie sets (though increasingly possible to do it the other way around…)
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