Wheel colliders
Wheel colliders use raycasting to form wheel-shaped collision geometry with suspension and tyre-based friction.
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The is a collider for grounded vehicles. It has built-in collision detection, wheel physics, and a slip-based tire friction model. It can be used for objects other than wheels, but it is specifically designed for vehicles with wheels.
Wheel collider
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Unity’s PhysX integration uses the PhysX 4.1 Vehicles SDK to simulate the wheel assembly of ground vehicles (that is, the wheels, suspension, and braking). This documentation covers how to interact with this SDK in Unity; for details of the SDK itself, see the PhysX 4.1 Vehicles SDK documentation.
You don’t need to understand how a real-world vehicle works to build a simple simulation. However, an understanding of the main elements such as suspension and wheel behavior can help you work more precisely with the different vehicle simulation properties available in Unity.
Topic | Description |
|---|---|
| Introduction to wheel colliders | Overview of the concepts and fundamental behaviors of the Rigidbody class and component. This section includes information on how Unity implements Wheel colliders to simulate ground wheel movement, and how to work with Wheel colliders in the Editor. |
| Wheel collider friction | How Unity simulates friction between the Wheel collider and the surface it travels across. |
| Wheel collider suspension | How Unity simulates a suspension system via the Wheel collider’s position and behavior. |
| Create a vehicle with Wheel colliders | Build a ground vehicle with Wheel colliders. This step-by-step walkthrough provides demonstration assets and code samples. |
| Wheel collider component reference | Reference page for the Wheel collider component. |