Engineering sketches form the 2D basis of parametric Computer-Aided Design (CAD), the foremost modeling paradigm for manufactured objects. In this paper we tackle the problem of learning based engineering sketch generation as a first step towards synthesis and composition of parametric CAD models. We propose two generative models, CurveGen and TurtleGen, for engineering sketch generation. Both models generate curve primitives without the need for a sketch constraint solver and explicitly consider topology for downstream use with constraints and 3D CAD modeling operations. We find in our perceptual evaluation using human subjects that both CurveGen and TurtleGen produce more realistic engineering sketches when compared with the current state-of-the-art for engineering sketch generation.

中文翻译：

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用于计算机辅助设计的工程草图生成

工程草图构成了参数化计算机辅助设计（CAD）的2D基础，CAD是制造对象的首要建模范例。在本文中，我们解决了基于学习的工程草图生成问题，这是迈向综合和组成参数化CAD模型的第一步。我们提出了两个生成模型，CurveGen和TurtleGen，用于工程草图生成。两种模型都可以生成曲线图元，而无需草图约束求解器，并明确考虑拓扑以供下游使用约束和3D CAD建模操作。我们在对人类受试者的感知评估中发现，与当前最先进的工程草图生成技术相比，CurveGen和TurtleGen都能生成更逼真的工程草图。