2009

■ Antialias 2-Pass Casts two bundles of rays. The first batch of rays
determines if the point in question is fully illuminated, shadowed, or in
the penumbra (soft area) of the shadow. If the point is in the penumbra,
a secondary batch of rays is cast to further refine the edge. The number of
initial rays is specified using the Pass 1 Quality spinner. The number of
secondary rays is specified using the Pass 2 Quality spinner.
2-Sided Shadows When on, backfaces are not ignored when calculating
shadows. Objects seen from the inside are not lit by lights from the outside.
This costs a bit more render time. When off, backfaces are ignored. Rendering
is quicker, but outside lights illuminate object interiors.
The faces inside the sliced sphere do not cast shadows if 2-Sided Shadows is not
selected.
Antialiasing Options group
Shadow Integrity The number of rays cast from an illuminated surface.
Shadow Quality The number of secondary rays cast from an illuminated
surface.
Shadow Spread The radius, in pixels, to blur the antialiased edge.
5120 | Chapter 18 Lights and Cameras