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

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”

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…)