是否点击平面

 true:不是

false:是

    bool GetMeshType(MeshFilter meshFilter)
    {
        Mesh mesh = meshFilter.mesh;
        Vector3[] normals = mesh.normals;
        for (int i = 1; i < normals.Length; i++)
        {
            if (normals[0] != normals[i])
            {
                return true;
            }
        }
        return false;
    }