针对各VRML造型在其局部坐标系中创建，采用变换矩阵实现了造型从局部坐标系下到世界坐标系下的坐标变换。

Because each model in VRML is created in local coordinate system, inconvenient to handle them uniformly, this paper infers a universal formula to transform model coordinates from UCS to WCS.

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然而，局部解析坐标变换方法需要满足在两个相邻界面之间存在一条水平直线的介质可分性条件。

In this paper, an analytical local orthogonal. coordinate transform and an analytical equation transform are constructed to flatten the interfaces and change the Helmholtz equation as a solvable form.

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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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