RaycastHit[] hits;

        Vector3 normal = transform.position - target.position;

        hits = Physics.RaycastAll(target.position, normal, float.PositiveInfinity, mMask);

        if (hits.Length>)

        {

            GameObject p = hits[].collider.gameObject;

            if (p != null)

            {

                Debug.LogError("被碰撞的物体是：" + hits.Length);

                SetMaterialsColor(p.GetComponent<Renderer>(), 0.5f);

            }

        }

private void SetMaterialsColor(Renderer _renderer, float Transpa)

    {

        Material m = _renderer.sharedMaterial;

        Color color = m.color;

        color.a = Transpa;

        m.SetColor("_Color",color);

    }