所有顶点都被视图截锥的右平面所剪裁。
All vertices are clipped by the right plane of the viewing frustum.
所有顶点都被视图截锥的前平面所剪辑。
All vertices are clipped by the front plane of the viewing frustum.
所有顶点都是不同的，而且城堡的城墙不会交叉。
All vertices are different and the sides of the castle do not intersect anywhere except for vertices.
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