不去渲染观察者能看的到得正面。常用于由内而外显示物体。
Front Don't render polygons facing towards the viewer. Used for turning objects inside-out.
切记，选择视图时要选择那些能够显示物体自然位置的视图。
It is important to select those views which show the object in its natural position.
对这次撞击的计算机模拟显示，这两个物体都会在撞击中熔化，而撞击者稠密的核心会以熔融岩石的形式落入地球的液化铁芯中。
Computer simulations of this impact show that both of the objects would melt in the impact and the dense core of the impactor would fall as molten rock into the liquefied iron core of Earth.
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