Does this object cast shadows?
ShadowCastingMode enum defines how and if shadows are cast from this object.
Typically shadows are either cast or not, but it's also possible to make shadows two-sided
(useful for otherwise single-sided geometry) or make a shadows-only object (that is
otherwise invisible in the Scene, but casts a shadow).
See Also: ShadowCastingMode, receiveShadows, Light.shadows.