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private static GameObject s_aroundCols;    public static void CreateAroundColliders()    {	    if(s_aroundCols != null) return;	    s_aroundCols = new GameObject("aroundCols");        s_aroundCols.transform.position = Vector3.zero;        s_aroundCols.transform.localScale = Vector3.one;        s_aroundCols.transform.localEulerAngles = Vector3.zero;        Vector3 top = Camera.main.ScreenToWorldPoint(new Vector3(Screen.width / 2f, Screen.height, 3f));        Vector3 bottom = Camera.main.ScreenToWorldPoint(new Vector3(Screen.width / 2f, 0f, 3f));        Vector3 left = Camera.main.ScreenToWorldPoint(new Vector3(0f, Screen.height/2f, 3f));        Vector3 right = Camera.main.ScreenToWorldPoint(new Vector3(Screen.width, Screen.height/2f, 3f));        float width = Vector3.Distance(left, right);        float height = Vector3.Distance(bottom, top);        PhysicMaterial pmat = new PhysicMaterial();        pmat.dynamicFriction = 0f;      //动摩擦力//        pmat.staticFriction = 0f;       //静摩擦力//        pmat.bounciness = 1f;       //弹力//        pmat.frictionCombine = PhysicMaterialCombine.Maximum;       //接触物体之间的摩擦力计算//        pmat.bounceCombine = PhysicMaterialCombine.Maximum;         //接触物体之间的弹力计算//        createOnCollider("top", s_aroundCols.transform, Vector3.zero, top, new Vector3(width, 0.05f, 0.05f), pmat);        createOnCollider("bottom", s_aroundCols.transform, Vector3.zero, bottom, new Vector3(width, 0.05f, 0.05f), pmat);        createOnCollider("left", s_aroundCols.transform, Vector3.zero, left, new Vector3(0.05f, height, 0.05f), pmat);        createOnCollider("right", s_aroundCols.transform, Vector3.zero, right, new Vector3(0.05f, height, 0.05f), pmat);    }    private static void createOnCollider(string name, Transform parent, Vector3 pos, Vector3 center, Vector3 size, PhysicMaterial mat)    {        GameObject col = new GameObject(name);        col.transform.position = pos;        col.transform.parent = parent;        BoxCollider box = col.AddComponent
   
    ();        box.center = center;        box.size = size;        box.material = mat;    }
   

如上所示

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