vertex of surface 中文意思是什麼
vertex of surface
解釋
面頂點-
In this example, then, the surface forms a virtual image 180mm to the left of the vertex.
因此，在本例中這曲面在頂點左方180mm處形成一虛象。 -
After studying a lot of documents of computer - graphics and computation of geometrical, based on nurbs, which is a pop expression to describe curve and surface, the author put forward a method ? ? to identify bad point by most excursion, to illustrate how to choose smooth base plane, which is not referred in most documents, and to introduce optimize method of operational research to combine surfaces, especially for surfaces combination with vertex, and improvement of combination effect
在解決多曲面有角點的拼接問題中引入了運籌學的優化方法，改善了多曲面拼接的效果，而且在ugii造型軟體的基礎上，用visualc + + 、 ug / openapi進行二次開發，加入了壞點剔除，曲線光順，曲面片之間的拼接等功能，很好的解決了反求工程中所遇到的問題。 -
Which combines four acceleration techniques : fast detection of overlapped regions by reverse calibration, more - careful selection of control points, fast surface closet point computation with closet vertex caching and compatibility test of pairing points based on the difference of modulation
針對兩幅距離像間的配準，我們分別從重疊區域檢測、控制點選取、對應點計算和對應點有效性檢查四個方面提出了多種加速方案，從而實現了大數據量距離像的快速局部配準。 -
In order to generate tool - path quickly, another method is presented. it can generate interference free tool - path directly from the section line of the triangulated surface model. search each vertex of the model to get the triangles which may be interfered using the radius of the cutter
為了解決這一問題，本文又提出了基於加工曲面的截平面法，通過刀具投影和曲面模型節點坐標的位置關系確定可能發生干涉的小三角片的集合，以加快乾涉檢測的速度，然後在這個集合上生成無干涉刀位點。 -
In order to get the better effect of showing organ surface, it also gives a new method to compute the normal vector at grid vertex for the drawing part of the system
在系統繪制部分，為了獲得更光滑的器官表面顯示效果，給出了網格頂點法向量計算的新方法。 -
The perpendicular distance from the base of a geometric figure to the opposite vertex, parallel side, or parallel surface
頂垂線，高線從一個幾何形體的底邊到相對的頂點、平行邊或平行面的垂直距離 -
Abstract : a new data structure that one link - list was composed of polygon - surface table, edge table and vertex table was proposed to describe the geometry information and topology information of control polyhedron m in the rese arch of modeling with closed surface. compared with other structures which were a pplicable to the work, the structure was understandable, economize and conveniently to modify. after describing the detail of the geometry information, topology inf ormation included in the tables of polygon - surface, edge and vertex, and the poin t - link form of the adjacency multilist between the tables, a concise instance was given in clanguage array
文摘:介紹了在閉曲面造型研究中，為描述控制多面體m的幾何信息和拓撲信息而設計使用的一種單鏈三表的數據結構.與其他適用與描述控制多面體的數據結構相比，該結構在結合了鄰接多重表方法后的特點是:關系描述清楚，節省存儲空間，方便查找和交互修改形體.在介紹單鏈中三表（面表、邊表、頂點表）所含的幾何信息細節、以及單鏈的三表之間的表示面、邊、頂點拓撲關系的指針的鄰接多重連接方式之後，本文給出了以c語言數組方式簡明描述的數據結構實例 -
When we get the surface model, we can project the vertex of polygons onto the input images to get the texture on the correspondent pixel and in turn get the texture on the surface model
多邊形的法向是該錐體平面的法向量。在得到物體表么網格模型后，可以通過計算該多邊形對應于輸入圖像上的像素獲取紋理信息，進而映射得到物體網格平面紋理值。 -
In this paper, i will present some algorithms of polyhedral visual hull reconstruction : ( 1 ) polyhedral v isual h ull generation a igorithm b ased one dge - pool - searching, which constrains the 3 - d intersections into the 2 - d planes intersection via the epipolar theory to reduce the complexity a nd c an r educe t he t imes f or c ones t o b e p rejected o nto t he i mage p lanes, i n which we induced the index list to every points on the surface of object, and connected the related points to get sub polygons on surface and in turn get the mesh model, we replace triangulation process of disordered points cloud by edge - pool searching. ; ( 2 ) reconstruction based on degenerated - polygon - intersection, which have the following improvements on traditional bull intersection : using degenerated polygon to orga nize intersected area on cone face, which may be discontinuous ; a fast intersection algorithm of polygons on the cone face based on degenerated polygons, which is consistent between the continuous polygons and the discontinuous ones. the intersection of degenerated polygons is similar to the convergence of two ordered lists, which is comparably simple to the bull operation ; ( 3 ) reconstruction algorithm based on ray - tracing, in which all the rays that run through the vertex on silhouette of object will intersect with all the cones correspondent to other silhouette, and we have to calculate the intersection of all such line segments, the endpoints of which are considered to lie on the surface of object and we will get the point cloud on the surface of object
同時利用共極線原理把三維計算投影到二維平面以降低求交計算的復雜度，該演算法可以減少光錐向圖像平面投影計算的次數，以邊池搜索取代散亂點集上進行的三角剖分； （ 2 ）基於退化多邊形求交的多面體可見殼模型重構，系統引入退化多邊形的概念，把錐體平面的交集中不連通的部分用一個退化多邊形來表示，並引入了新的基於退化多邊形的求交演算法，與傳統多面體可見殼重構相比，該演算法有以下幾點創新：在圖像平面以退化多邊形組織投影錐體和物體輪廓的交集，把任意錐面與物體輪廓的交集歸一到一個退化多邊形；基於退化多邊形的二維平面上多邊形快速相交演算法，該演算法在一定程度上就是兩個有序鏈表的合併，大大簡化了先前的布爾求交計算； （ 3 ）基於光線跟蹤的演算法，該演算法中所有通過輪廓頂點的光線和對應其它圖像輪廓的光錐進行求交計算，最後得到每次求交計算得到線段的交集，該線段的頂點就認為是物體表面點，從而得到物體表面的點雲。 -
The approach to exactly calculate geometric parameters of subdivision surface, such as limiting point, tangent vector and normal vector, are illustrated. ( 2 ) the number of geometric elements ( vertex, edge, facet ) within control mesh grows exponentially as the increase of subdivision levels in general subdivision schemes
（ 2 ）在正常的曲面細分過程中，控制網格上幾何元素（頂點、邊、面）的數量是按照幾何級數增加的，會產生龐大的冗餘數據。 -
When calculating the cost of edge collapse, we consider the influence of edge length and surface curvature. and, the position of the new vertex is selected from the veytexes of the edge collapsed, this can not only preserve the initial model shape, but also reduce the calculation of cpu and meet real - time rendering of virtual environment
在折疊邊的代價估計中，均衡考慮了多邊形邊的長度和多邊形表面曲率影響；折疊邊的頂西北工業大學博士學位論文點位置從折疊邊的頂點中選取，既有助於保留了初始模型的形狀，又減少運算量，滿足快速繪制的需求。 -
Parallex bump mapping is a new technology to archive the target that renders wrinkle surface of high quality with a relatively low cost. it uses a much smart way that offsets the surface ' s texture coordinates than the ordinary displacement bump mapping technology that offsets the surface ' s geometry vertex instead. we will propose a bulk of idea to improve this technology ' s performance and quality
視差紋理映射技術是新近提出的實現物體表面粗糙感的一種凹凸映射技術，它是對目前因計算量過大而無法應用於實時渲染系統中的位移映射技術的改進，這種技術不是對物體表面的頂點進行偏移，而是藉助于高度圖對紋理坐標進行偏移，從而近似達到位移映射技術的效果。 -
The traditional way of rendering an image is to use a vertex and a polygon to store the information. as the rendering unit is polygon, more polygons will be needed when a smooth surface is rendered
它拋棄了傳統的三角片表示方法，只記錄點的信息，由這些點的信息直接重構出最終的圖像，從而為解決大量三維采樣數據的快速繪制處理提供了一條新的路徑。
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