The oriented rp 3d - reconstruction method has been studied in the paper , with the focus on the bone ct image processing method and surface reconstruction with triangular facet 本文研究了面向rp的骨骼三維重構(gòu)方法,重點(diǎn)研究了其中的ct圖象處理算法和三角片表面重構(gòu)算法。
Geometry continuity of the triangular facets is analyzed in the course of generating stl files . the index relation is built up between every triangular facet by making use of this continuity 通過(guò)分析stl轉(zhuǎn)化過(guò)程中三角形面片之間的幾何連續(xù)性,應(yīng)用其連續(xù)性,使得各個(gè)三角形之間建立一種索引關(guān)系。
As to simple concave polygons or complicated planar polygons with holes , they must be decomposed to the collection of triangular facets or arbitrary convex polygons to satisfy the requirement of succeeding graphic operations 對(duì)于簡(jiǎn)單凹多邊形或有內(nèi)孔的復(fù)雜平面多邊形,需要將它們剖分成三角面片的集合或任意凸多邊形的集合。
Aiming at the defects of the acis mesh models , a mesh simplification algrithom is introduced , which is based on the criteria of the angle between the normals of two triangular facets . through twice simplification to the original model , a three - level lod model is obtained C - superman系統(tǒng)在acis平臺(tái)上進(jìn)行幾何造型,本文針對(duì)acis網(wǎng)格模型的缺陷用基于三角片法矢判別的準(zhǔn)則進(jìn)行網(wǎng)格簡(jiǎn)化,利用該簡(jiǎn)化算法對(duì)原始網(wǎng)格模型進(jìn)行兩次簡(jiǎn)化獲得了三級(jí)精度的細(xì)節(jié)層次模型。
Basically like “ adaptive approach ” , the method can control triangulation density with respect to the change of normal curvature of the surface generating a small number of triangular facets , and thiny triangles , degenerate triangles and “ cracks ” in 3d space will not occur , but the speed of the algorithm is higher than that of adaptive one 該方法基本上可以像“自適應(yīng)”方法一樣,根據(jù)曲面的法曲率變化來(lái)控制三角化剖分的密度,生成的三角片數(shù)量較少,并且可以避免在三維空間產(chǎn)生狹長(zhǎng)的三角形、退化三角形與“裂縫” ,運(yùn)行速度明顯比自適應(yīng)方法快。
After research surface reconstruction with triangular facets , contours of first layer and the last layer are triangulated with layer separation algorithm firstly . and then the least polar - angle criterion is presented for linking two convex contours , and the method is also given in which non - convex contour is transformed to a set of convex contour . with the splitting and integrating algorithm , the single - to - multi - contour reconstruction with triangular facet has been simplified to one - to - one contour 首先采用層析式算法對(duì)起始層和結(jié)束層中的輪廓進(jìn)行三角剖分;然后采用最小極角法實(shí)現(xiàn)兩凸輪廓間的三角片重構(gòu),并討論了非凸輪廓變換為凸輪廓的方法;最后,使用分裂與合并技術(shù)將單輪廓匹配多輪廓的三角片重構(gòu)簡(jiǎn)化為單輪廓之間的三角片重構(gòu),最終完成整個(gè)骨骼表面的三角片重構(gòu)。