STL三角网格面沿外法线方向等距算法研究
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STL三角网格面沿外法线方向等距算法研究(开题报告,论文10000字)
摘要
对曲面的离散在离散过程中采用三角形进行逼近的离散结果称之为三角网格面。对三角网格面的等距研究一直是一个研究的热门话题。针对STL文件的格式,本文采用了基于公共顶点的一环领域三角面片面法向量加权相加归一化的算法。该算法首先对三角网格面模型进行公共点的定位,然后加权相加求得顶点法向量,最后等距构建等距面。该算法在一定的等距距离范围内避免了等距可能出现的断裂、自交问题,并且等距模型的精度良好,还原性高。
关键词:3D打印;等距算法;三角网格面;
Research on isometric algorithm of STL triangle mesh surface along external normal direction
ABSTRACT
The discrete result of the approximation of a surface by using a triangle in a discrete process is called a triangular mesh surface. Isometric for the triangular mesh surface has always been a hot topic of research. For the format of STL file, this paper adopts a triangular-plane one-sided normal vector weighted addition and normalization algorithm based on common vertices. The algorithm firstly locates the repeated points of the triangular mesh surface model, then adds the weights to obtain the vertex normal vector, and finally equidistantly constructs the equidistant surface. The algorithm avoids the problem of fracture and self-intersection which may occur in equidistant range within a certain equidistant range, and the accuracy of the equidistant model is good and the reduction is high.
Key Words: 3D printing; isometric algorithm; triangular mesh surface
目录
摘要 I
ABSTRACT II
第一章 绪论 1
1.1 研究背景 1
1.2 研究步骤 5
1.3 本文主要研究内容 6
第二章 STL格式介绍与等距技术概述 7
2.1 STL文件格式介绍 7
2.2 等距技术概述及理论基础 8
2.3 三角网格面沿外法线等距出现的问题 10
2.4 本章小结 11
第三章 等距算法推导与程序设计 12
3.1 算法流程概述 12
3.2 算法推导 12
3.3 程序实现变量定义界面展示 13
3.4 经济性分析 19
3.5 本章小结 20
第四章 总结与展望 21
参考文献 22
致谢 24
附录 25
附录A:stlread.m文件代码 25
附录B:stlwrite.m文件代码 28
附录C: isometric.m文件代码 34