Another particle system to be added to the scene when a particle collides with scene geometry.
- iOS 8.0+
- macOS 10.10+
- Mac Catalyst 13.0+
- tvOS 9.0+
- watchOS 3.0+
When a particle collides with scene geometry, SceneKit adds a copy of the specified particle system to the scene at the location of the collision. (To define collision behavior, see the
Use this property to simulate effects such as rain—one particle system simulates falling raindrops, and another particle system simulates the splashes that occur where each raindrop strikes a surface.
The default value of this property is
nil, specifying that no additional systems are added to the scene on particle collision.