Insight Journal (ISSN 2327-770X) - Walk In A Triangulation : Straight Walk

Walk In A Triangulation : Straight Walk

Image & Pervasive Access Lab, National Centre for Scientific Research (CNRS), Fusionopolis, Singapore

Please use this identifier to cite or link to this publication: http://hdl.handle.net/10380/3341

Published in The Insight Journal - 2012 January-December.

Submitted by Alexandre Gouaillard on 02-14-2012.

This document describes the implementation in ITK of the Straight Walk in a Triangulation algorithm proposed by Devillers et al. Using the exact discrete geometrical orientation predicate, and the itk::QuadEdgeMesh API of ITK, we propose an efficient implementation that locates a point in a triangulated mesh structure. This paper is accompanied with the source code and examples that should provide enough details for users. This work has for principal intended an exact and robust implementation of a Delaunay triangulation / Voronoi tesselation in ITK, which will be presented in a separate paper, once done.

Code

Automatic Testing Results by Insight-Journal Dashboard on Tue Jan 29 17:14:47 2013 for revision #1

expertise: 5 sensitivity: 3.5

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Reviews

A useful function, but with some build difficulty. by Davis Vigneault on 2015-06-09 09:57:49 for revision #1

expertise: 2 sensitivity: 3.5

Summary:

The authors provide an implementation of the Straight Walk method for efficiently determining which cell in a mesh contains a specified point. This has particular application in reversing a mesh parameterization, among other tasks.

Hypothesis:

Evidence:

Open Science:

One function, OrientTest(), appeared to be missing. Other than that, all code was provided. This builds off a public domain code base for exact floating point calculations, cited in the article.

Reproducibility:

I downloaded, compiled, and ran the code, with some difficulty. Here are the steps I needed to take to get it working:

1. It appears that the submodule is not linked correctly in github. I needed to remove the .gitmodules file and add the submodule manually. Here is my StackOverflow question [3] which solved the problem.

2. I had to change WalkInTriangulation/CMakeLists.txt:6:

include( ${USE_ITK_FILE}) ==> include( ${ITK_USE_FILE})

3. At this point, CMake runs without errors; but when building I'm told that OrientationTest is missing. I assumed that OrientationTest is a wrapper for orient2d, and added the following function to itkWalkInTriangulationFunction.h:

template< typename TPoint >

double

OrientationTest( TPoint a, TPoint b, TPoint c )

{

double pa[2];

double pb[2];

double pc[2];

pa[0] = a[0];

pa[1] = a[1];

pb[0] = b[0];

pb[1] = b[1];

pc[0] = c[0];

pc[1] = c[1];

return orient2d(pa, pb, pc);

}

With those changes, the example seems to work correctly, though I haven't done thorough testing yet.

Use of Open Source Software:

This takes advantage of software currently in the public domain:

http://www.cs.cmu.edu/~quake/robust.html

Open source Contributions:

With some modification, this could be integrated into the toolkit. Integrating the provided floating point calculation software could be useful independent of this application.

Code Quality :

I have only compiled and run on Ubuntu. However, the library used is in C, and therefore is expected to be portable.

Quality of the data :

Interest:

This submission has implications for mesh processing, as noted in the authors' later work.

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Paper Id:	851
Categories:	Code speed optimization, Data Representation, Mesh
Keywords:	QuadEdgeMesh, ITK, Planar Mesh, Search
Toolkits:	ITK, CMake
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Status:	Open for public review

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