应用于附加到该 Rigidbody2D 的所有 Collider2D 的 PhysicsMaterial2D。
此处指定的 PhysicsMaterial2D 应用于所有附加的 Collider2D，除非 Collider2D 在 Collider2D.sharedMaterial 中指定了自己的 PhysicsMaterial2D。如果未指定 Collider2D.sharedMaterial 或 Rigidbody2D.sharedMaterial，则使用全局 PhysicsMaterial2D。如果未指定全局 PhysicsMaterial2D，则默认值为：PhysicsMaterial2D.friction = 0.4 和 PhysicsMaterial2D.bounciness = 0。
换言之，Collider2D 上指定的 PhysicsMaterial2D 优先于 Rigidbody2D 上指定的 PhysicsMaterial2D，而后者优先于全局 PhysicsMaterial2D。
另请参阅：Collider2D.sharedMaterial 和 PhysicsMaterial2D。
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