它丰富了目前计算机绘图中对最简单圆形——点的齐次表示及其透视变换。
The result is that the homogeneous presentation and its perspective transformation for the simplest figure—the point are enriched in computer drawing.
局部坐标系列世界坐标系的坐标变换可用于简化三维绘图，而世界坐标系到局部坐标系的坐标变换可用于产生透视投影。
The transformation from WCS to LCS can simplify the 3D drafting. The transformation from LCS to WCS can be used to generate the perspective projection.
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