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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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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Then the double scanning recognition sketch based on the one dimensional wave in time field is determined for the concrete system.

针对具体的弹载系统，确立基于时域一维波形的二次扫描识别方案。

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The Ecosign team fired up AutoCAD, a design software used by architects and engineers to sketch three-dimensional project drafts, and used PCs to plug in technical numbers for Olympic courses.

WSJ: Paul Mathews of Ecosign, Scouting the World for Killer Ski Slopes | Creating

Each Masterpiece is handcrafted over a period of at least two years, working from an original sketch and a wax mold and with rare, fine gemstones, which ultimately forges the three-dimensional works of art.

FORBES: Cindy Chao's Butterfly Brooch Added to Smithsonian Gem Hall