Notice that the aspect ratio and the values for the clipping planes are float values.
注意纵横比和剪贴板的值应为浮点值。
Together, the viewing Angle and the clipping planes define what is called the view frustum.
观察角度和切割面共同定义了视域。
The clipping planes also determine how depth buffer precision is distributed over the scene.
剪裁平面也决定深度缓存精度如何在场景上分布。
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