在Plane四周放入四个Cube，设置其Mesh Filter为None，并添加Box Collider(盒子碰撞器)，勾选Box Collider即可。这时角色在边界漫游时，就会和无形的墙发生碰撞。
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比如，如果有一个活动的平台并想在上面放一些刚体盒子，那就应该设置平台为运动学刚体而不仅是不加刚体的碰撞器。
For example if you have an animated platform and you want to place some Rigidbody boxes on top, you should make the platform a Kinematic Rigidbody instead of just a Collider without a Rigidbody.
比如，如果有一个活动的平台并想在上面放一些刚体盒子，那就应该设置平台为运动学刚体而不仅是不加刚体的碰撞器。
For example if you have an animated platform and you want to place some Rigidbody boxes on top, you should make the platform a Kinematic Rigidbody instead of just a Colliderwithout a Rigidbody.
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