592 lines
20 KiB
HTML
592 lines
20 KiB
HTML
<!DOCTYPE html>
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<html>
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<head>
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<meta charset="utf-8"/>
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<title>libigl</title>
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<meta name="author" content="Alec Jacobson and Daniele Panozzo and others"/>
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<link type="text/css" rel="stylesheet" href="tutorial/style.css"/>
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<script type='text/javascript' src='http://cdn.mathjax.org/mathjax/latest/MathJax.js?config=TeX-AMS-MML_HTMLorMML'></script>
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<link rel='stylesheet' href='http://yandex.st/highlightjs/7.3/styles/default.min.css'>
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<script src='http://yandex.st/highlightjs/7.3/highlight.min.js'></script>
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<script>hljs.initHighlightingOnLoad();</script>
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# libigl - A simple c++ geometry processing library
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</head>
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<body>
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<figure>
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<img src="tutorial/images/libigl-logo.jpg" alt="" />
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<figcaption></figcaption></figure>
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<p><a href="http://igl.ethz.ch/projects/libigl/">http://igl.ethz.ch/projects/libigl/</a>
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<a href="https://github.com/alecjacobson/libigl/">https://github.com/alecjacobson/libigl/</a></p>
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<p>Copyright 2014 - Alec Jacobson, Daniele Panozzo, Olga Diamanti, Kenshi
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Takayama, Leo Sacht, Wenzel Jacob, etc.</p>
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<p>Libigl is first and foremost a <em>header</em> library. Each header file should
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contain a single function. This function may have multiple overloads and
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prototypes. All functions should use the <code>igl::</code> namespace and should adhere to
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the conventions and styles listed in the <a href="style_guidelines.html">style
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guidelines</a>.</p>
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<blockquote>
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<p><strong>New:</strong> As of 1 July 2014, we have released libigl as beta version 1.0.
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There are a number of changes we collected for this release to minimize
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confusion and changes to how you use libigl. See <a href="#version1.0changes">Version 1.0
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Changes</a>.</p>
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</blockquote>
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<h2 id="installation">Installation</h2>
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<p>Libigl is a <em>header</em> library. You do <strong>not</strong> need to build anything to install.
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Simple add <code>igl/</code> to your include path and include relevant headers. Here’s a
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small “Hello, World” program:</p>
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<pre><code class="cpp">#include <igl/cotmatrix.h>
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#include <Eigen/Dense>
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#include <Eigen/Sparse>
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#include <iostream>
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int main()
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{
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Eigen::MatrixXd V(4,2);
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V<<0,0,
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1,0,
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1,1,
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0,1;
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Eigen::MatrixXi F(2,3);
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F<<0,1,2,
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0,2,3;
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Eigen::SparseMatrix<double> L;
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igl::cotmatrix(V,F,L);
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std::cout<<"Hello, mesh: "<<std::endl<<L*V<<std::endl;
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return 0;
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}
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</code></pre>
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<p>If you save this in <code>hello.cpp</code>, then on <code>gcc</code> with Eigen installed via
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macports for example you could compile this with:</p>
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<pre><code class="bash">gcc -I/opt/local/include/eigen3 -I./igl/ hello.cpp -o hello
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</code></pre>
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<p>Running <code>./hello</code> would then produce</p>
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<pre><code>Hello, mesh:
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0.5 0.5
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-0.5 0.5
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-0.5 -0.5
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0.5 -0.5
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</code></pre>
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<h2 id="tutorial">Tutorial</h2>
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<p>As of version 1.0, libigl includes an introductory
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<a href="http://libigl.github.io/libigl/tutorial/tutorial.html">tutorial</a> that covers
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its basic functionalities.</p>
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<h2 id="dependencies">Dependencies</h2>
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<ul>
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<li>Eigen3 Last tested with Eigen Version 3.2</li>
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</ul>
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<h3 id="optional">Optional</h3>
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<ul>
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<li>OpenGL (disable with <code>IGL_NO_OPENGL</code>)
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<ul>
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<li>OpenGL >= 4 (enable with <code>IGL_OPENGL_4</code>)</li>
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</ul></li>
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<li>AntTweakBar (disable with <code>IGL_NO_ANTTWEAKBAR</code>) Last tested 1.16 (see
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<code>libigl/external/AntTweakBar</code>)</li>
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<li>GLEW Windows and Linux</li>
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<li>OpenMP</li>
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<li>libpng libiglpng extra only</li>
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<li>Mosek libiglmosek extra only</li>
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<li>Matlab libiglmatlab extra only</li>
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<li>boost libiglboost, libiglcgal extra only</li>
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<li>SSE/AVX libiglsvd3x3 extra only</li>
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<li>CGAL libiglcgal extra only
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<ul>
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<li>boost</li>
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<li>gmp</li>
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<li>mpfr</li>
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</ul></li>
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<li>CoMiSo libcomiso extra only</li>
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</ul>
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<h3 id="optionalincludedinexternal">Optional (included in external/)</h3>
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<ul>
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<li>TetGen libigltetgen extra only</li>
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<li>Embree libiglembree extra only</li>
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<li>tinyxml2 libiglxml extra only</li>
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<li>glfw libviewer extra only</li>
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<li>LIM liblim extra only</li>
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</ul>
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<h2 id="headeronly">Header only</h2>
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<p>Libigl is designed to work “out-of-the-box” as a headers only library. To
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include libigl in your project. You need only include the libigl/include/
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directory in your include path. To
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compile a hello-word example.cpp:</p>
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<pre><code>#include <Eigen/Dense>
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#include <igl/readOBJ.h>
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#include <iostream>
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int main(int argc, char * argv[])
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{
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if(argc>1)
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{
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Eigen::MatrixXd V;
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Eigen::MatrixXi F;
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igl::readOBJ(argv[1],V,F);
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std::cout<<"Hello, mesh with "<<V.rows()<<" vertices!"<<std::endl;
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}else{
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std::cout<<"Hello, world!"<<std::endl;
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}
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return 0;
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}
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</code></pre>
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<p>using gcc (replacing appropriate paths):</p>
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<pre><code>g++ -I/usr/local/igl/libigl/include \
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-I/opt/local/include/eigen3 example.cpp -o example
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</code></pre>
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<p>Then run this example with:</p>
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<pre><code>./example examples/shared/TinyTorus.obj
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</code></pre>
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<h2 id="compilationasastaticlibrary">Compilation as a static library</h2>
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<p>Libigl is developed most often on Mac OS X, though has current users in Linux
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and Windows.</p>
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<h3 id="linuxmacosxcygwin">Linux/Mac OS X/Cygwin</h3>
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<p>Libigl may also be compiled to a static library. This is advantageous when
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building a project with libigl, since when used as an header-only library can
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slow down compile times.</p>
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<p>To build the entire libigl library producing lib/libigl.a, issue:</p>
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<pre><code>cd build
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make lib
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</code></pre>
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<p>You may need to edit Makefile.conf accordingly. Best to give yourself an
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<code>IGL_USERNAME</code> and add a custom install suite for yourself. Then you can enable
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appropriate extras.</p>
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<h4 id="extras">Extras</h4>
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<p>Once you’ve set up an <code>IGL_USERNAME</code> and enabled extras within Makefile.conf.
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You can build the extra libraries (into lib/ligiglpng.a, lib/libiglmatlab.a,
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lib/libigltetgen.a, lib/libiglmosek.a, etc.) by issuing:</p>
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<pre><code>cd build
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make extras
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</code></pre>
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<h4 id="examples">Examples</h4>
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<p>You can make a slew of examples by issuing:</p>
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<pre><code>cd build
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make examples
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</code></pre>
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<h4 id="external">External</h4>
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<p>Finally there are a number of external libraries that we include in
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./external/ because they are either difficult to obtain or they have been
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patched for easier use with libigl. Please see the respective readmes in
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those directories.</p>
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<h5 id="installinganttweakbar">Installing AntTweakBar</h5>
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<p>To build the a static AntTweakBar library on Mac OS X issue:</p>
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<pre><code>cd external/AntTweakBar/src
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make -f Makefile.osx.igl
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</code></pre>
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<h5 id="installingtetgen">Installing Tetgen</h5>
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<p>To build the tetgen library and executable on Mac OS X issue:</p>
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<pre><code>cd external/tetgen
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make clean
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rm -f obj/*.o
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make -f Makefile.igl tetgen
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rm -f obj/*.o
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make -f Makefile.igl tetlib
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</code></pre>
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<h5 id="installingmedit">Installing medit</h5>
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<p>To build the igl version of the medit executable on Mac OS X issue:</p>
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<pre><code>cd external/medit
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make -C libmesh
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make -f Makefile.igl medit
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</code></pre>
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<h5 id="installingembree2.0">Installing Embree 2.0</h5>
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<p>To build the embree library and executables on Mac OS X issue:</p>
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<pre><code>cd external/embree
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mkdir build
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cd build
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cmake ..
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# Or using a different compiler
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#cmake .. -DCMAKE_C_COMPILER=/opt/local/bin/gcc -DCMAKE_CXX_COMPILER=/opt/local/bin/g++
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make
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# Could also install embree to your root, but libigl examples don't expect
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# this
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#sudo make install
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</code></pre>
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<h5 id="installingtinyxml2">Installing tinyxml2</h5>
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<p>To build the a static tinyxml2 library on Mac OS X issue:</p>
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<pre><code>cd external/tinyxml2
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cmake .
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make
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</code></pre>
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<h5 id="installingyimg">Installing YImg</h5>
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<p>To build the a static YImg library on Mac OS X issue:</p>
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<pre><code>cd external/yimg
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make
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</code></pre>
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<p>You may need to install libpng. Systems with X11 might find this already
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installed at <code>/usr/X11/lib</code>.</p>
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<h3 id="windowsexperimental">Windows (Experimental)</h3>
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<p>To build a static library (.lib) on windows, open Visual Studio 2010.</p>
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<ul>
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<li>New > Project …</li>
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<li>Visual C++ > Win32</li>
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<li>Win32 Console Application</li>
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<li>Name: libiglVisualStudio</li>
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<li>Uncheck “Create directory for solution”</li>
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<li>Then hit OK, and then Next</li>
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<li>Check “Static Library”</li>
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<li>Uncheck “Precompiled headers”</li>
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<li>Add all include/igl/*.cpp to the sources directory</li>
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<li>Add all include/igl/*.h to the headers directory</li>
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<li>Open Project > libigl Properties…</li>
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<li>Add the path to eigen3 to the include paths</li>
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<li>Change the target name to libigl</li>
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<li>Build and pray (this should create libigl.lib</li>
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</ul>
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<p><a href="http://msdn.microsoft.com/en-us/library/ms235627(v=vs.80).aspx">Source</a></p>
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<h2 id="examples">Examples</h2>
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<p>To get started, we advise that you take a look at a few examples:</p>
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<pre><code>./examples/hello-world/
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./examples/meshio/
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./examples/basic-topology/
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./examples/ReAntTweakBar/
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</code></pre>
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<h2 id="extras">Extras</h2>
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<p>Libigl compartmentalizes dependences via its organization into a <em>main</em> libigl
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library and “extras.”</p>
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<h3 id="bbw">bbw</h3>
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<p>This library extra contains functions for computing Bounded Biharmonic Weights, can
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be used with and without the <a href="#mosek">mosek</a> extra via the <code>IGL_NO_MOSEK</code>
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macro.</p>
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<h3 id="boost">boost</h3>
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<p>This library extra utilizes the graph functions in the boost library for find
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connected components and performing breadth-first traversals.</p>
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<h3 id="cgal">cgal</h3>
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<p>This library extra utilizes CGAL’s efficient and exact intersection and
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proximity queries.</p>
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<h3 id="embree">embree</h3>
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<p>This library extra utilizes embree’s efficient ray tracing queries.</p>
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<h3 id="matlab">matlab</h3>
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<p>This library extra provides support for reading and writing <code>.mat</code> workspace
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files, interfacing with Matlab at run time and compiling mex functions.</p>
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<h3 id="mosek">mosek</h3>
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<p>This library extra utilizes mosek’s efficient interior-point solver for
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quadratic programs.</p>
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<h3 id="png">png</h3>
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<p>This library extra uses <code>libpng</code> and <code>YImage</code> to read and write <code>.png</code> files.</p>
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<h3 id="svd3x3">svd3x3</h3>
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<p>This library extra implements “as-rigid-as-possible” (ARAP) deformation
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techniques using the fast singular value decomposition routines
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written specifically for 3x3 matrices to use <code>SSE</code> intrinsics. This extra can
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still be compiled without sse support and support should be determined
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automatically at compile time via the <code>__SSE__</code> macro.</p>
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<h3 id="tetgen">tetgen</h3>
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<p>This library extra provides a simplified wrapper to the tetgen 3d tetrahedral meshing
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library.</p>
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<h3 id="viewer">viewer</h3>
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<p>This library extra utilizes glfw and glew to open an opengl context and launch
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a simple mesh viewer.</p>
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<h3 id="xml">xml</h3>
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<p>This library extra utilizes tinyxml2 to read and write serialized classes
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containing Eigen matrices and other standard simple data-structures.</p>
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<h2 id="development">Development</h2>
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<p>Further documentation for developers is listed in tutorial.html,
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style_guidelines.html</p>
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<h2 id="license">License</h2>
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<p>See <code>LICENSE.txt</code></p>
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<h2 id="zipping">Zipping</h2>
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<p>Zip this directory without .git litter and binaries using:</p>
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<pre><code>git archive -prefix=libigl/ -o libigl.zip master
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</code></pre>
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<h2 id="version1.0changes">Version 1.0 Changes</h2>
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<p>Our beta release marks our confidence that this library can be used outside of
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casual experimenting. To maintain order, we have made a few changes which
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current users should read and adapt their code accordingly.</p>
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<h3 id="renamedfunctions">Renamed functions</h3>
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<p>The following table lists functions which have changed name as of version
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1.0.0:</p>
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<table>
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<colgroup>
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<col style="text-align:left;"/>
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<col style="text-align:left;"/>
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</colgroup>
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<thead>
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<tr>
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<th style="text-align:left;">Old</th>
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<th style="text-align:left;">New</th>
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</tr>
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</thead>
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<tbody>
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<tr>
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<td style="text-align:left;"><code>igl::add_barycenter</code></td>
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<td style="text-align:left;"><code>igl::false_barycentric_subdivision</code></td>
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</tr>
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<tr>
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<td style="text-align:left;"><code>igl::areamatrix</code></td>
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<td style="text-align:left;"><code>igl::vector_area_matrix</code></td>
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</tr>
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<tr>
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<td style="text-align:left;"><code>igl::barycentric2global</code></td>
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<td style="text-align:left;"><code>igl::barycentric_to_global</code></td>
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</tr>
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<tr>
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<td style="text-align:left;"><code>igl::boundary_faces</code></td>
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<td style="text-align:left;"><code>igl::boundary_facets</code></td>
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</tr>
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<tr>
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<td style="text-align:left;"><code>igl::boundary_vertices_sorted</code></td>
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<td style="text-align:left;"><code>igl::boundary_loop</code></td>
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</tr>
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<tr>
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<td style="text-align:left;"><code>igl::cotangent</code></td>
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<td style="text-align:left;"><code>igl::cotmatrix_entries</code></td>
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</tr>
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<tr>
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<td style="text-align:left;"><code>igl::edgetopology</code></td>
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<td style="text-align:left;"><code>igl::edge_topology</code></td>
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</tr>
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<tr>
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<td style="text-align:left;"><code>igl::gradMat</code></td>
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<td style="text-align:left;"><code>igl::grad</code></td>
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</tr>
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<tr>
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<td style="text-align:left;"><code>igl::is_manifold</code></td>
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<td style="text-align:left;"><code>igl::is_edge_manifold</code></td>
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</tr>
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<tr>
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<td style="text-align:left;"><code>igl::mexStream</code></td>
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<td style="text-align:left;"><code>igl::MexStream</code></td>
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</tr>
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<tr>
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<td style="text-align:left;"><code>igl::moveFV</code></td>
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<td style="text-align:left;"><code>igl::average_onto_vertices</code></td>
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</tr>
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<tr>
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<td style="text-align:left;"><code>igl::moveVF</code></td>
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<td style="text-align:left;"><code>igl::average_onto_faces</code></td>
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</tr>
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<tr>
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<td style="text-align:left;"><code>igl::plot_vector</code></td>
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<td style="text-align:left;"><code>igl::print_vector</code></td>
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</tr>
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<tr>
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<td style="text-align:left;"><code>igl::pos</code></td>
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<td style="text-align:left;"><code>igl::HalfEdgeIterator</code></td>
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</tr>
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<tr>
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<td style="text-align:left;"><code>igl::plane_project</code></td>
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<td style="text-align:left;"><code>igl::project_isometrically_to_plane</code></td>
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</tr>
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|
<tr>
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|
<td style="text-align:left;"><code>igl::project_points_mesh</code></td>
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|
<td style="text-align:left;"><code>igl::line_mesh_intersection</code></td>
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|
</tr>
|
|
<tr>
|
|
<td style="text-align:left;"><code>igl::read</code></td>
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|
<td style="text-align:left;"><code>igl::read_triangle_mesh</code></td>
|
|
</tr>
|
|
<tr>
|
|
<td style="text-align:left;"><code>igl::removeDuplicates.cpp</code></td>
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|
<td style="text-align:left;"><code>igl::remove_duplicates</code></td>
|
|
</tr>
|
|
<tr>
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|
<td style="text-align:left;"><code>igl::removeUnreferenced</code></td>
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|
<td style="text-align:left;"><code>igl::remove_unreferenced</code></td>
|
|
</tr>
|
|
<tr>
|
|
<td style="text-align:left;"><code>igl::tt</code></td>
|
|
<td style="text-align:left;"><code>igl::triangle_triangle_adjacency</code></td>
|
|
</tr>
|
|
<tr>
|
|
<td style="text-align:left;"><code>igl::vf</code></td>
|
|
<td style="text-align:left;"><code>igl::vertex_triangle_adjacency</code></td>
|
|
</tr>
|
|
<tr>
|
|
<td style="text-align:left;"><code>igl::write</code></td>
|
|
<td style="text-align:left;"><code>igl::write_triangle_mesh</code></td>
|
|
</tr>
|
|
<tr>
|
|
<td style="text-align:left;"><code>igl::manifold_patches</code></td>
|
|
<td style="text-align:left;"><code>igl::orientable_patches</code></td>
|
|
</tr>
|
|
<tr>
|
|
<td style="text-align:left;"><code>igl::selfintersect</code></td>
|
|
<td style="text-align:left;"><code>igl::remesh_self_intersections</code></td>
|
|
</tr>
|
|
<tr>
|
|
<td style="text-align:left;"><code>igl::project_mesh</code></td>
|
|
<td style="text-align:left;"><code>igl::line_mesh_intersection</code></td>
|
|
</tr>
|
|
<tr>
|
|
<td style="text-align:left;"><code>igl::triangulate</code></td>
|
|
<td style="text-align:left;"><code>igl::polygon_mesh_to_triangle_mesh</code></td>
|
|
</tr>
|
|
<tr>
|
|
<td style="text-align:left;"><code>igl::is_manifold</code></td>
|
|
<td style="text-align:left;"><code>igl::is_edge_manifold</code></td>
|
|
</tr>
|
|
<tr>
|
|
<td style="text-align:left;"><code>igl::triangle_wrapper</code></td>
|
|
<td style="text-align:left;"><code>igl::triangulate</code></td>
|
|
</tr>
|
|
</tbody>
|
|
</table>
|
|
|
|
<h3 id="miscellaneous">Miscellaneous</h3>
|
|
|
|
<ul>
|
|
<li>To match interfaces provided by (all) other quadratic optimization
|
|
libraries, <code>igl::min_quad_with_fixed</code> and <code>igl::active_set</code> now expect as
|
|
input twice the quadratic coefficients matrix, i.e. the Hessian. For
|
|
example, <code>igl::min_quad_with_fixed(H,B,...)</code> minimizes <span class="math">\(\frac{1}{2}x^T H
|
|
x+x^T B\)</span>.</li>
|
|
<li>We have inverted the <code>IGL_HEADER_ONLY</code> macro to <code>IGL_STATIC_LIBRARY</code>. To
|
|
compile using libigl as a header-only library, simply include headers and
|
|
libigl in the header search path. To link to libigl, you must define the
|
|
<code>IGL_STATIC_LIBRARY</code> macro at compile time and link to the <code>libigl*.a</code>
|
|
libraries.</li>
|
|
<li>Building libigl as a static library is now more organized. There is a
|
|
<code>build/</code> directory with Makefiles for the main library (<code>Makefile</code>) and each
|
|
dependency (e.g. <code>Makefile_mosek</code> for <code>libiglmosek.a</code>)</li>
|
|
<li><code>igl::polar_svd</code> now always returns a rotation in <code>R</code>, never a reflection.
|
|
This mirrors the behavior of <code>igl::polar_svd3x3</code>. Consequently the <code>T</code>
|
|
part may have negative skews.</li>
|
|
<li>We have organized the static</li>
|
|
<li>The previous <code>igl::grad</code> function, which computed the per-triangle gradient
|
|
of a per-vertex scalar function has been replaced. Now <code>igl::grad</code> computes
|
|
the linear operator (previous computed using <code>igl::gradMat</code>). The gradient
|
|
values can still be recovered by multiplying the operator against the scalar
|
|
field as a vector and reshaping to have gradients per row.</li>
|
|
<li><code>MASSMATRIX_*</code> has become <code>MASSMATRIX_TYPE_*</code></li>
|
|
<li>The function <code>igl::project_normals</code>, which cast a line for each vertex of
|
|
mesh <em>A</em> in the normal direction and found the closest intersection along
|
|
these lines with mesh <em>B</em>, has been removed.</li>
|
|
</ul>
|
|
|
|
<h2 id="contact">Contact</h2>
|
|
|
|
<p>Libigl is a group endeavor led by Alec Jacobson and Daniele Panozzo. Please
|
|
contact <a href="mailto:alecjacobson@gmail.com">alecjacobson@gmail.com</a> if you have
|
|
questions or comments. We are happy to get feedback! Enjoy!</p>
|
|
|
|
<p>If you’re using libigl in your projects, quickly <a href="mailto:alecjacobson@gmail.com">drop us a
|
|
note</a>. Tell us who you are and what you’re using
|
|
it for. This helps us apply for funding and justify spending time maintaining
|
|
this.</p>
|
|
|
|
<p>If you find bugs or have problems please use our <a href="https://github.com/libigl/libigl/issues">github issue tracking
|
|
page</a>.</p>
|
|
|
|
<h2 id="academiccitation">Academic citation</h2>
|
|
|
|
<p>If you use libigl in your research projects, please cite the papers we
|
|
implement as appropriate. To cite the library in general, you could use this
|
|
BibTeX entry:</p>
|
|
|
|
<pre><code class="bibtex">@misc{libigl,
|
|
title = {{libigl}: A simple {C++} geometry processing library},
|
|
author = {Alec Jacobson and Daniele Panozzo and others},
|
|
note = {http://igl.ethz.ch/projects/libigl/},
|
|
year = {2014},
|
|
}
|
|
</code></pre>
|
|
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</body>
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</html>
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