物理材质描述了如何处理碰撞物体（摩擦力、弹性）。
其他资源: Collider。
| bounceCombine | 确定如何组合弹性。 |
| bounciness | 表面的弹性如何？值为 0 不会反弹。值为 1 将在没有任何能量损失的情况下反弹。 |
| dynamicFriction | 已在移动时使用的摩擦力。此值通常介于 0 和 1 之间。 |
| frictionCombine | 确定如何组合摩擦力。 |
| staticFriction | 物体位于表面上时使用的摩擦系数。 |
| PhysicsMaterial | 创建一个新的材质。 |
| GetInstanceID | 获取对象的实例 ID。 |
| ToString | 返回对象的名称。 |
| Destroy | 移除 GameObject、组件或资源。 |
| DestroyImmediate | 立即销毁对象 obj。强烈建议您改用 Destroy。 |
| DontDestroyOnLoad | 加载新场景时不要销毁目标对象。 |
| FindAnyObjectByType | 检索类型为 type 的任何已加载活动对象。 |
| FindFirstObjectByType | 检索类型为 type 的第一个已加载活动对象。 |
| FindObjectsByType | 检索类型为 type 的所有已加载对象的列表。 |
| Instantiate | 克隆对象 original 并返回克隆。 |
| InstantiateAsync | 捕获原始对象（必须与某个 GameObject 相关）的快照，并返回 AsyncInstantiateOperation。 |
| bool | 对象是否存在？ |
| operator != | 比较两个对象是否引用不同的对象。 |
| operator == | 比较两个对象引用是否引用同一个对象。 |
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