获取车轮的地面碰撞数据。
如果车轮与某物发生碰撞，则返回 true 并填充 hit 结构。如果车轮未发生碰撞，
则返回 false 并保持 hit 结构不变。
报告的命中对象始终为最接近的命中对象。轮胎摩擦模型
不自动响应其他 PhysicMaterial，
因此，必须根据本函数返回的碰撞体材质调整 forwardFriction 和 sidewaysFriction，
以手动完成对不同地面材质的模拟。
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