Collider2D.sharedMaterial

# [Collider2D](https://docs.unity3d.com/cn/2019.4/ScriptReference/Collider2D.html).sharedMaterial

public [PhysicsMaterial2D](https://docs.unity3d.com/cn/2019.4/ScriptReference/PhysicsMaterial2D.html) **sharedMaterial** ;

## 描述

应用于碰撞体的 [PhysicsMaterial2D](https://docs.unity3d.com/cn/2019.4/ScriptReference/PhysicsMaterial2D.html)。

如果未指定 [PhysicsMaterial2D](https://docs.unity3d.com/cn/2019.4/ScriptReference/PhysicsMaterial2D.html)，则使用附加了该碰撞体的 [Rigidbody2D](https://docs.unity3d.com/cn/2019.4/ScriptReference/Rigidbody2D.html) 上的 [Rigidbody2D.sharedMaterial](https://docs.unity3d.com/cn/2019.4/ScriptReference/Rigidbody2D-sharedMaterial.html)。如果未将该碰撞体附加到 [Rigidbody2D](https://docs.unity3d.com/cn/2019.4/ScriptReference/Rigidbody2D.html)，或者未指定 [Rigidbody2D.sharedMaterial](https://docs.unity3d.com/cn/2019.4/ScriptReference/Rigidbody2D-sharedMaterial.html)，则使用全局 [PhysicsMaterial2D](https://docs.unity3d.com/cn/2019.4/ScriptReference/PhysicsMaterial2D.html)。如果未指定全局 [PhysicsMaterial2D](https://docs.unity3d.com/cn/2019.4/ScriptReference/PhysicsMaterial2D.html)，则默认为：[PhysicsMaterial2D.friction](https://docs.unity3d.com/cn/2019.4/ScriptReference/PhysicsMaterial2D-friction.html) = 0.4 和 [PhysicsMaterial2D.bounciness](https://docs.unity3d.com/cn/2019.4/ScriptReference/PhysicsMaterial2D-bounciness.html) = 0。

换言之，[Collider2D](https://docs.unity3d.com/cn/2019.4/ScriptReference/Collider2D.html) 上指定的 [PhysicsMaterial2D](https://docs.unity3d.com/cn/2019.4/ScriptReference/PhysicsMaterial2D.html) 优先于 [Rigidbody2D](https://docs.unity3d.com/cn/2019.4/ScriptReference/Rigidbody2D.html) 上指定的 [PhysicsMaterial2D](https://docs.unity3d.com/cn/2019.4/ScriptReference/PhysicsMaterial2D.html)，而后者优先于全局 [PhysicsMaterial2D](https://docs.unity3d.com/cn/2019.4/ScriptReference/PhysicsMaterial2D.html)。

另请参阅：[Rigidbody2D.sharedMaterial](https://docs.unity3d.com/cn/2019.4/ScriptReference/Rigidbody2D-sharedMaterial.html) 和 [PhysicsMaterial2D](https://docs.unity3d.com/cn/2019.4/ScriptReference/PhysicsMaterial2D.html)。