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<h1 id="libigl-asimplecgeometryprocessinglibrary">libigl - A simple C++ geometry processing library</h1>

<figure>
<img src="libigl-teaser.png" alt="" />
</figure>

<p><a href="https://github.com/libigl/libigl/">https://github.com/libigl/libigl/</a></p>

<p>libigl is a simple C++ geometry processing library. We have a wide
functionality including construction of sparse discrete differential geometry
operators and finite-elements matrices such as the contangent Laplacian and
diagonalized mass matrix, simple facet and edge-based topology data structures,
mesh-viewing utilities for OpenGL and GLSL, and many core functions for matrix
manipulation which make <a href="http://eigen.tuxfamily.org">Eigen</a> feel a lot more
like MATLAB.</p>

<p>It is first and foremost a header library. Each header file contains a single
function. Most are tailored to operate on a generic triangle mesh stored in an
n-by&#8211;3 matrix of vertex positions V and an m-by&#8211;3 matrix of triangle indices F.
The library may also be <a href="build/">compiled</a> into a statically linked
library, for faster compile times with your projects.</p>

<p>We use the <a href="http://eigen.tuxfamily.org">Eigen</a> library heavily in our code. Our
group prototypes a lot in MATLAB, and we have a useful <a href="matlab-to-eigen.html">conversion
table</a> from
MATLAB to libigl/Eigen.</p>

<h1 id="tutorial">Tutorial</h1>

<p>As of version 1.0, libigl includes an introductory
<a href="tutorial/tutorial.html">tutorial</a> that covers
its basic functionalities.</p>

<h2 id="installation">Installation</h2>

<p>Libigl is a <em>header</em> library. You do <strong>not</strong> need to build anything to install.
Simply add <code>igl/</code> to your include path and include relevant headers. Here is a
small &#8220;Hello, World&#8221; program:</p>

<pre><code class="cpp">#include &lt;igl/cotmatrix.h&gt;
#include &lt;Eigen/Dense&gt;
#include &lt;Eigen/Sparse&gt;
#include &lt;iostream&gt;
int main()
{
  Eigen::MatrixXd V(4,2);
  V&lt;&lt;0,0,
     1,0,
     1,1,
     0,1;
  Eigen::MatrixXi F(2,3);
  F&lt;&lt;0,1,2,
     0,2,3;
  Eigen::SparseMatrix&lt;double&gt; L;
  igl::cotmatrix(V,F,L);
  std::cout&lt;&lt;&quot;Hello, mesh: &quot;&lt;&lt;std::endl&lt;&lt;L*V&lt;&lt;std::endl;
  return 0;
}
</code></pre>

<p>If you save this in <code>hello.cpp</code>, then you could compile this with (assuming
Eigen is installed in /opt/local/include/eigen3):</p>

<pre><code class="bash">gcc -I/opt/local/include/eigen3 -I./igl/ hello.cpp -o hello
</code></pre>

<p>Running <code>./hello</code> would then produce</p>

<pre><code>Hello, mesh:
 0.5  0.5
-0.5  0.5
-0.5 -0.5
 0.5 -0.5
</code></pre>

<h2 id="dependencies">Dependencies</h2>

<p>Dependencies are on a per-include basis and the majority of the functions in
libigl depends only on the <a href="http://eigen.tuxfamily.org">Eigen</a> library.</p>

<p>For more information see our <a href="tutorial/tutorial.html">tutorial</a>.</p>

<h1 id="download">Download</h1>

<p>You can keep up to date by cloning a read-only copy of our GitHub
<a href="https://github.com/libigl">repository</a>.</p>

<h2 id="howtocontribute">How to contribute</h2>

<p>If you are interested in joining development, please fork the repository and
submit a <a href="https://help.github.com/articles/using-pull-requests/">pull request</a>
with your changes.</p>

<h2 id="license">License</h2>

<p>libigl is primarily <a href="http://www.mozilla.org/MPL/2.0/">MPL2</a> licensed
(<a href="http://www.mozilla.org/MPL/2.0/FAQ.html">FAQ</a>). Some files contain
third-party code under other licenses. We&#8217;re currently in the processes of
identifying these and marking appropriately.</p>

<h2 id="attribution">Attribution</h2>

<p>If you use libigl in your academic 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://libigl.github.io/libigl/},
  year = {2014},
}
</code></pre>

<h1 id="contact">Contact</h1>

<p>Libigl is a group endeavor led by <a href="http://www.cs.columbia.edu/~jacobson/">Alec
Jacobson</a> and <a href="http://www.inf.ethz.ch/personal/dpanozzo/">Daniele
Panozzo</a>. Please <a href="&#109;&#97;&#105;&#108;&#x74;&#111;&#x3a;&#x61;&#x6c;&#101;&#x63;&#x6a;&#x61;&#x63;&#111;&#98;&#115;&#111;&#110;&#64;&#103;&#109;&#x61;&#105;&#108;&#x2e;&#x63;&#x6f;&#x6d;&#44;&#x64;&#x61;&#110;&#105;&#101;&#x6c;&#101;&#x2e;&#x70;&#x61;&#110;&#x6f;&#122;&#x7a;&#x6f;&#64;&#x67;&#x6d;&#x61;&#x69;&#x6c;&#x2e;&#99;&#x6f;&#x6d;">&#99;&#x6f;&#x6e;&#116;&#x61;&#99;&#x74;
&#117;&#115;</a> if you have
questions or comments. We are happy to get feedback!</p>

<p>If you&#8217;re using libigl in your projects, quickly <a href="&#x6d;&#x61;&#105;&#108;&#x74;&#x6f;&#58;&#97;&#x6c;&#101;&#99;&#106;&#x61;&#x63;&#111;&#x62;&#x73;&#x6f;&#110;&#64;&#103;&#x6d;&#x61;&#x69;&#x6c;&#46;&#99;&#x6f;&#x6d;&#x2c;&#100;&#x61;&#110;&#105;&#x65;&#108;&#x65;&#x2e;&#112;&#97;&#x6e;&#111;&#x7a;&#x7a;&#x6f;&#x40;&#103;&#109;&#x61;&#105;&#x6c;&#x2e;&#x63;&#111;&#109;">&#x64;&#x72;&#111;&#112; &#x75;&#x73; &#97;
&#110;&#111;&#116;&#101;</a>. Tell us who you
are and what you&#8217;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>

<h3 id="copyright">Copyright</h3>

<p>2014 Alec Jacobson, Daniele Panozzo, Olga Diamanti, Kenshi
Takayama, Leo Sacht, Wenzel Jacob, Nico Pietroni, Amir Vaxman</p>

<figure>
<img src="tutorial/images/libigl-logo.jpg" alt="" />
</figure>

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