The appearance and physical characteristics of an individual wheel associated with an physics vehicle behavior.
- iOS 8.0+
- macOS 10.10+
- Mac Catalyst 13.0+
- tvOS 9.0+
- watchOS 2.0+
To use wheels in a vehicle simulation, include them when creating an
SCNPhysics object with the
vehicle initializer, then add the vehicle object to your scene’s physics world using the physics world’s
Creating a Wheel
You create a wheel with an
SCNNode object whose contents provide the wheel’s visual representation—a geometry that rotates when the simulated vehicle rolls along a surface. The node representing a wheel must be a child of the node containing the physics body that serves as the vehicle’s chassis, and each wheel in a vehicle must reference a unique node. Typically, you load a scene file that contains a node hierarchy representing the vehicle and all of its wheels. Next, you designate which nodes serve as the body and wheels.
SCNPhysics behavior that a wheel is attached to manages its participation in the physics simulation, you don’t need to attach a physics body to the
SCNNode object representing a wheel.
Changing a Wheel’s Physical Properties
The properties of a wheel define the geometry of its connection to the vehicle and simulate its size, traction, and suspension. You can change these properties after the wheel and the vehicle containing it have been added to the physics world. In this way, you can simulate effects such as variable suspension and flat tires.