Meanwhile we get the universal parametric model for freehand sketch.

同时，建立了手绘草图的统一的参数化模型。

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In this paper we have studied a three-dimensional modelling approach based on freehand sketch.

研究一种基于手绘草图进行三维建模的方法。

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In this paper, a freehand sketch-based three-dimensional CAD system is studied and implemented.

该文研究并实现了一种新型的基于笔的手绘草图三维CAD系统。

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