2009

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 off.
Antialiasing Options group
Shadow Integrity Sets the number of rays in the initial bundle of rays cast.
These rays are projected from every surface that receives light from the light
source.
The number of rays is as follows:
1=4 rays
2=5 rays
3 to N=NxN rays.
For example, setting Shadow Integrity to 5 generates 25 rays.
This is the primary control for finding small objects and thin spaces between
objects. If the shadows are missing a small object in your scene, try increasing
Shadow Integrity one step at a time. Also, if the penumbra (soft area) is blotchy,
try increasing this setting.
Shadow Types and Shadow Controls | 5125