Strategies of cubic projection and rotation transformation were put forward in this paper in order to transform the complicated 3D issues into 2D planar issues.
采用最佳拟合直线方法，计算产品模型投影轮廓多边形的长轴方位，并据此计算旋转变换所需转动角度。
World coordinate that had undergone some transform such as translation, and rotation was unified with display coordinate through 2D projection plane of 3D display coordinate.
实物坐标系经过一系列变换通过三维显示的二维投影面与显示坐标系统一。
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