triangulation | 易学教程

What is the best initial shape for 3D Delaunay incremental algorithm?

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问题 I'm doing 3D Delaunay, with the incremental method. I've tested it in 2D with an initial triangle for inserting the vertices and it works great, but if I use a triangle for 3D, some vertices do not fall into any circumscribed sphere therefore they don't get inserted. I've tried with a tetrahedron but if the first node falls into the four of the faces, all vertices create new edges towards this new vertex, and deletes all of the initial triangles. 回答1: Whichever shape you take, you will always

Triangulate a polygon whose contour touches itself with poly2tri?

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问题 Is it possible to triangulate a polygon which touches itself (like in the image above) with poly2tri? 回答1: My solution: use Clipper to offset the polygon, triangulate it, and re-offset to obtain the final mesh. Of course, this is a hack which does not always work since offsetting the polygon is a possibly destructive operation (if the are tiny ends on the polygon, they might not offset back to their original positions). 来源： https://stackoverflow.com/questions/34221075/triangulate-a-polygon

polygon triangulation reflex vertex

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问题 Hi i am trying to perform polygon triangulation. I understood the ear clipping method for a simple Polygon ( Concave or Convex ). i am stuck at finding whether a vertex is reflex or not . what i have read at multiple places is about clock-wise and counter clockwise orientations which i am unable to understand . in short what are those orientations referring to and please give me some hint on checking whether the vertex is reflex or not . here is the link of an article i am following: and here

Implementing Triangulation in android

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问题 Hi Guys: I am new to android. I am developing an application in android 2.2 to identify location of user by means of any available resources (GPS , Networks etc). I have done finding location through GPS and using SIM network along with internet. Now problem is want to locate device when no GPS and no internet is available. In this case I have to implement Triangulation. I know theory of concept of triangulation but to implement is realy a biggggggg deal to me. Will any body kindly guide me

Calculating distance of an AP including signal-to-noise ratio

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For some reason a friend and myself were talking about calculating the distance between yourself (laptop, phone, etc.) and an AP based of the info you get from the devices (RSSI, freq, SNR, etc...). So, after spending sometime researching about trilateration, triangulation, and free-space path loss. (with the help of some blog posts and wiki) I was able to get a distance in meters from the AP to my laptop and the results were a lot better then what I thought they would be. Whenever I'm in the same room or there's a line of sight to the AP, the accuracy is about a foot. But now, I want to take

OpenCV - Tilted camera and triangulation landmark for stereo vision

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问题 I am using a stereo system and so I am trying to get world coordinates of some points by triangulation. My cameras present an angle, the Z axis direction (direction of the depth) is not normal to my surface. That is why when I observe flat surface, I get no constant depth but a "linear" variation, correct? And I want the depth from the baseline direction... How I can re-project? A piece of my code with my projective arrays and triangulate function : #C1 and C2 are the cameras matrix (left and

Triangulation of 3D points with K vertices per face

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问题 I'm working with Three.js. I have a collection of 3D points (x, y, z) and a collection of faces. One face is composed of K points . It can be as well convex as concave. I found nothing that could help me in the Three.js documentation. One solution could be to triangulate those shapes, but so far I haven't found any simple 3D triangulation algorithm. The other solution would be doing something like that : var pointsGeometry = new THREE.Geometry(); pointsGeometry.vertices.push(new THREE.Vector3

Surface reconstruction from 2 planar contours [closed]

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问题 Closed . This question is opinion-based. It is not currently accepting answers. Want to improve this question? Update the question so it can be answered with facts and citations by editing this post. Closed 5 years ago . There is a class of algorithms for triangulation between two planar contours. These algorithms try to make a "good triangulation" to fill a space between these contours: One of them (Optimal surface reconstruction from planar contours) is based on the dynamic programming

Is there a good framework/sdk on wifi positioning with c#? [closed]

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问题 Closed. This question is off-topic. It is not currently accepting answers. Want to improve this question? Update the question so it's on-topic for Stack Overflow. Closed 6 years ago . I'm just searching a framework for wifi positioning in c#. actually i found nearly everything that i need for a robot project in form of a framework. even primitive object recoginition!!! now i wonder if some of you know if there is one, or whether i have to do it by myself. 回答1: So finally if someone is also

Efficient Packing Algorithm for Regular Polygons

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问题 I'm looking for a packing algorithm which will reduce a regular polygon into rectangles and right triangles. The algorithm should attempt to use as few such shapes as possible and should be relatively easy to implement (given the difficulty of the challenge). If possible, the answer to this question should explain the general heuristics used in the suggested algorithm. 回答1: I think the answer is fairly simple for regular polygons. Find an axis of symmetry, and draw a line between each vertex