Apple Motion 4 - Manual (Page 1234)

Note: Selecting non-uniform softness can impact playback performance.
Nonuniform softness Uniform softness
Note: Intersecting objects reveal an unnatural effect of using uniform softness. Because
an equal amount of blur is applied to the entire shadow, the blur appears to spill out in
front of the intersecting object, creating a strange appearance. This effect can be
eliminated in two ways; either by deselecting the Uniform Softness checkbox or setting
the object to not receive shadows.
Non-uniform softness
Uniform softness
Uniform softness with text object rejecting shadows
Shadow appears in front
of intersecting objects.
No shadow appears.
The shadow is not visible
on the text object.
1234 Chapter 18 3D Compositing