Apple Motion 4 - Manual (Page 1243)

Other Reflection Parameters
Casts Reflection: The Properties tab of every object also contains a Casts Reflections
parameter (in the Blending section) that controls whether or not an object is reflective.
This pop-up menu has three choices demonstrated by the text object in the figures below:
• Yes: The object is reflected in nearby reflective objects.
• No: The object is ignored by reflective surfaces.
1243 Chapter 18 3D Compositing