【摘要】：在設計三維模型初期,設計師會構建一些概念模型,利用透視繪圖等方法繪制專業(yè)的二維草圖,但是深度信息的缺失降低了二維草圖對三維物體的表現(xiàn)力。幸而得益于計算機圖形學和可視化的發(fā)展,三維草圖建模技術應運而生。本文提出了一種簡單,快捷的基于三維草圖的建模方法。該方法提供了一套完整的從草圖繪制到模型創(chuàng)建的建模流程,允許用戶在自由定義的繪圖平面上繪制描述模型特征的三維草圖,并根據草圖創(chuàng)建三維模型�；谌S草圖的模型創(chuàng)建算法使用分治的思想,主要分為三個步驟:首先利用三維草圖網絡的幾何信息和拓撲信息搜索圍成模型表面的圈集合。然后基于Laplacian框架計算草圖網絡中每個圈的目標平均曲率及法向量并生成曲面片。最后將曲面片拼接成完整的三維模型。比起現(xiàn)有的基于草圖的交互式建模工具,本文方法能夠充分保證模型創(chuàng)建結果與設計師預期一致。本文方法具有操作簡單,建模速度快,建模結果準確的特點。
[Abstract]:At the beginning of designing 3D model, designers will construct some conceptual models and draw professional 2D sketches by means of perspective drawing, but the lack of depth information reduces the expressive force of 2D sketches on 3D objects. Fortunately, thanks to the development of computer graphics and visualization, 3D sketch modeling technology emerges as the times require. In this paper, a simple and fast modeling method based on 3D sketch is proposed. This method provides a complete set of modeling flow from sketching to model creation, which allows users to draw 3D sketches describing the features of the model on the freely defined drawing plane, and to create 3D models according to sketches. The model creation algorithm based on 3D sketch uses the idea of divide and conquer, which is divided into three steps: firstly, the geometric information and topological information of 3D sketch network are used to search the circle set around the surface of the model. Then, based on the Laplacian framework, the target average curvature and normal vector of each cycle in the sketch network are calculated and the surface patches are generated. Finally, the surface patches are spliced into a complete three-dimensional model. Compared with the existing sketch-based interactive modeling tools, this method can fully ensure that the results of model creation are consistent with the expectations of designers. The method in this paper has the characteristics of simple operation, fast modeling speed and accurate modeling results.
【學位授予單位】：浙江大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TP391.41

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本文編號：2512617