A mask that defines which lights add shadows to the sprite.
- iOS 8.0+
- macOS 10.10+
- Mac Catalyst 13.0+
- tvOS 9.0+
- watchOS 2.0+
To determine whether this sprite is affected by being a shadow generated by a light, its
shadow property is tested against the light’s
category property by performing a logical AND operation. If the comparison results in a nonzero value, the sprite is drawn using a shadowed effect.
The default value is 0x00000000 (all bits cleared).