An image or other visual content affecting the shape and color of a light’s illuminated area.
- iOS 8.0+
- macOS 10.9+
- tvOS 9.0+
- watchOS 2.0+
In photographic and stage lighting terminology, a gobo (also known as a flag or cookie) is a stencil, gel, or other object placed just in front of a light source, shaping or coloring the beam of light.
You alter the appearance of a spotlight by changing the
contents property of the object permanently assigned to this property. As with other material properties, you can use a color or image, or a Core Animation layer containing animated content, as a lighting gobo.