04/10/2003
15-462 Graphics I
27
Pass 2: Enhanced Ray Tracing
•Classical
ray tracing
–Specular
to specular light transport
•For
diffuse-to-specular transport:
–Should
integrate incoming light over hemisphere
–Approximate
by using small frustum in direction of ideal reflection
–Use
radiosity of pixels calculated in Pass 1
–Apply
recursively if visible surface is specular