Version: 2019.3
public bool GetGroundHit (out WheelHit hit);

説明

衝突したときの情報を取得します

If the wheel collides with something, returns true and fills the hit structure. If the wheel is not colliding, returns false and leaves hit structure unchanged.

The reported hit is always the closest one. Because the tire friction model does not automatically respond to other PhysicMaterials, any simulation of different ground materials must be done manually by adjusting forwardFriction and sidewaysFriction based on collider's material returned here.