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+<!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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+</head>
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+<body>
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+
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+<h1 id="compilinglibiglasastaticlibrary">Compiling libigl as a static library</h1>
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+
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+<blockquote>
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+<p>Warning: compiling libigl as a static library is considerably more difficult
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+than using it as a header-only library (see <code>../README.md</code> instead). Do it
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+only if you are experienced with C++ and you want to improve your compilation
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+times.</p>
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+</blockquote>
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+
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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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+
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+<h3 id="linuxmacosxcygwin">Linux/Mac OS X/Cygwin</h3>
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+
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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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+
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+<p>To build the entire libigl library producing <code>lib/libigl.a</code>, issue:</p>
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+
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+<pre><code>cd build
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+make lib
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+</code></pre>
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+
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+<p>You may need to edit <code>Makefile.conf</code> 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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+
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+<h4 id="extras">Extras</h4>
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+
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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 <code>lib/ligiglpng.a</code>, <code>lib/libiglmatlab.a</code>,
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+<code>lib/libigltetgen.a</code>, <code>lib/libiglmosek.a</code>, etc.) by issuing:</p>
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+
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+<pre><code>cd build
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+make extras
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+</code></pre>
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+
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+<h4 id="examples">Examples</h4>
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+
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+<p>You can make a slew of examples by issuing:</p>
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+
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+<pre><code>cd build
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+make examples
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+</code></pre>
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+
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+<h4 id="external">External</h4>
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+
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+<p>Finally there are a number of external libraries that we include in
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+<code>./external/</code> 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 those
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+directories.</p>
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+
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+<h5 id="installinganttweakbar">Installing AntTweakBar</h5>
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+
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+<p>To build the a static AntTweakBar library on Mac OS X issue:</p>
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+
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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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+
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+<h5 id="installingtetgen">Installing Tetgen</h5>
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+
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+<p>To build the tetgen library and executable on Mac OS X issue:</p>
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+
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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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+
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+<h5 id="installingmedit">Installing medit</h5>
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+
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+<p>To build the igl version of the medit executable on Mac OS X issue:</p>
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+
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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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+
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+<h5 id="installingembree2.0">Installing Embree 2.0</h5>
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+
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+<p>To build the embree library and executables on Mac OS X issue:</p>
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+
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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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+
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+<h5 id="installingtinyxml2">Installing tinyxml2</h5>
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+
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+<p>To build the a static tinyxml2 library on Mac OS X issue:</p>
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+
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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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+
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+<h5 id="installingyimg">Installing YImg</h5>
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+
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+<p>To build the a static YImg library on Mac OS X issue:</p>
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+
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+<pre><code>cd external/yimg
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+make
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+</code></pre>
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+
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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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+
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+<h3 id="windowsexperimental">Windows (Experimental)</h3>
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+
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+<p>To build a static library (.lib) on windows, open Visual Studio 2010.</p>
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+
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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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+
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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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+
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+<h2 id="examples">Examples</h2>
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+
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+<p>To get started, we advise that you take a look at a few examples:</p>
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+
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+<pre><code>./examples/hello-world/
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+
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+./examples/meshio/
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+
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+./examples/basic-topology/
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+
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+./examples/ReAntTweakBar/
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+</code></pre>
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+
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+<h2 id="extras">Extras</h2>
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+
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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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+
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+<h3 id="bbw">bbw</h3>
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+
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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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+
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+<h3 id="boost">boost</h3>
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+
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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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+
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+<h3 id="cgal">cgal</h3>
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+
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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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+
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+<h3 id="embree">embree</h3>
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+
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+<p>This library extra utilizes embree’s efficient ray tracing queries.</p>
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+
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+<h3 id="matlab">matlab</h3>
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+
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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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+
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+<h3 id="mosek">mosek</h3>
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+
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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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+
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+<h3 id="png">png</h3>
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+
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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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+
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+<h3 id="svd3x3">svd3x3</h3>
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+
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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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+
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+<h3 id="tetgen">tetgen</h3>
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+
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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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+
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+<h3 id="viewer">viewer</h3>
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+
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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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+
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+<h3 id="xml">xml</h3>
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+
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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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+
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+<h2 id="development">Development</h2>
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+
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+<p>Further documentation for developers is listed in
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+<a href="../style_guidelines.html">style_guidelines.html</a>.</p>
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+
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+<h2 id="license">License</h2>
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+
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+<p>See <code>LICENSE.txt</code></p>
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+
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+<h2 id="zipping">Zipping</h2>
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+
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+<p>Zip this directory without .git litter and binaries using:</p>
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+
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+<pre><code>git archive -prefix=libigl/ -o libigl.zip master
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+</code></pre>
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+
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+<h2 id="explicitspecializationoftemplatedfunctions">Explicit specialization of templated functions</h2>
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+
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+<p>Special care must be taken by the developers of each function and
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+class in the libigl library that uses C++ templates. If this function
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+is intended to be compiled into the statically linked libigl library
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+then function is only compiled for each <i>explicitly</i> specialized
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+declaration. These should be added at the bottom of the corresponding
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+.cpp file surrounded by a</p>
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+
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+<pre><code>#ifdef IGL_STATIC_LIBRARY
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+</code></pre>
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+
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+<p>Of course, a developer may not know ahead of time which
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+specializations should be explicitly included in the igl static lib.
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+One way to find out is to add one explicit specialization for each
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+call in one’s own project. This only ever needs to be done once for
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+each template.</p>
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+
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+<p>The process is somewhat mechanical using a linker with reasonable error
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+output.</p>
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+
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+<p>Supposed for example we have compiled the igl static lib, including the
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+cat.h and cat.cpp functions, without any explicit instanciation. Say
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+using the makefile in the <code>libigl</code> directory:</p>
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+
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+<pre><code>cd $LIBIGL
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+make
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+</code></pre>
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+
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+<p>Now if we try to compile a project and link against it we may get
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+an error like:</p>
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+
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+<pre><code>Undefined symbols for architecture x86_64:
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+"Eigen::Matrix<int, -1, -1, 0, -1, -1> igl::cat<Eigen::Matrix<int, -1, -1, 0, -1, -1> >(int, Eigen::Matrix<int, -1, -1, 0, -1, -1> const&, Eigen::Matrix<int, -1, -1, 0, -1, -1> const&)", referenced from:
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+uniform_sample(Eigen::Matrix<double, -1, -1, 0, -1, -1> const&, Eigen::Matrix<int, -1, -1, 0, -1, -1> const&, int, double, Eigen::Matrix<double, -1, -1, 0, -1, -1>&)in Skinning.o
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+"Eigen::SparseMatrix<double, 0, int> igl::cat<Eigen::SparseMatrix<double, 0, int> >(int, Eigen::SparseMatrix<double, 0, int> const&, Eigen::SparseMatrix<double, 0, int> const&)", referenced from:
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+covariance_scatter_matrix(Eigen::Matrix<double, -1, -1, 0, -1, -1> const&, Eigen::Matrix<int, -1, -1, 0, -1, -1> const&, ArapEnergy, Eigen::SparseMatrix<double, 0, int>&)in arap_dof.o
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+arap_rhs(Eigen::Matrix<double, -1, -1, 0, -1, -1> const&, Eigen::Matrix<int, -1, -1, 0, -1, -1> const&, ArapEnergy, Eigen::SparseMatrix<double, 0, int>&)in arap_dof.o
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+</code></pre>
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+
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+<p>This looks like a mess, but luckily we don’t really need to read it
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+all. Just copy the first part in quotes</p>
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+
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+<pre><code>Eigen::Matrix<int, -1, -1, 0, -1, -1> igl::cat<Eigen::Matrix<int, -1, -1, 0, -1, -1> >(int, Eigen::Matrix<int, -1, -1, 0, -1, -1> const&, Eigen::Matrix<int, -1, -1, 0, -1, -1> const&)
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+</code></pre>
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+
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+<p>, then append it
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+to the list of explicit template specializations at the end of
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+<code>cat.cpp</code> after the word
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+<strong>template</strong> and followed by a semi-colon.
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+Like this:</p>
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+
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+<pre><code>#ifdef IGL_STATIC_LIBRARY
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+// Explicit template specialization
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+template Eigen::Matrix<int, -1, -1, 0, -1, -1> igl::cat<Eigen::Matrix<int, -1, -1, 0, -1, -1> >(int, Eigen::Matrix<int, -1, -1, 0, -1, -1> const&, Eigen::Matrix<int, -1, -1, 0, -1, -1> const&);
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+#endif
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+</code></pre>
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+
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+<p>Then you must recompile the IGL static library.</p>
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+
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+<pre><code>cd $LIBIGL
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+make
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+</code></pre>
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+
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+<p>And try to compile your project again, potentially repeating this
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+process until no more symbols are undefined.</p>
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+
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+<p><code>It may be useful to check that you code compiles with
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+no errors first using the headers-only version to be sure that all errors are from missing template
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+specializations.</code></p>
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+
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+<p>If you’re using make then the following command will
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+reveal each missing symbol on its own line:</p>
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+
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+<pre><code>make 2>&1 | grep "referenced from" | sed -e "s/, referenced from.*//"
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+</code></pre>
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+
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+<p>Alternatively you can use the <code>autoexplicit.sh</code> function
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+which (for well organized .h/.cpp pairs in libigl) automatically
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+create explicit instanciations from your compiler’s error messages.
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+Repeat this process until convergence:</p>
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+
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+<pre><code>cd /to/your/project
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+make 2>$LIBIGL/make.err
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+cd $LIBIGL
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+cat make.err | ./autoexplicit.sh
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+make clean
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+make
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+</code></pre>
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+
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+<h3 id="benefitsofstaticlibrary">Benefits of static library</h3>
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+
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+<ul>
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+<li><strong>Faster compile time</strong>: Because the libigl library
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+is already compiled, only the new code in ones project must be
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+compiled and then linked to IGL. This means compile times are
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+generally faster.</li>
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+<li><strong>Debug or optimized</strong>: The IGL static
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+library may be compiled in debug mode or optimized release mode
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+regardless of whether one’s project is being optimized or
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+debugged.</li>
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+</ul>
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+
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+<h3 id="drawbacksofstaticlibrary">Drawbacks of static library</h3>
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+
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+<ul>
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+<li><strong>Hard to use templates</strong>: Special
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+care</a> (by the developers of the library) needs to be taken when
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+exposing templated functions.</li>
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+</ul>
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+
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+<h1 id="compressed.h.cpppair">Compressed .h/.cpp pair</h1>
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+
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+<p>Calling the script:</p>
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+
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+<pre><code>scripts/compress.sh igl.h igl.cpp
|
|
|
+</code></pre>
|
|
|
+
|
|
|
+<p>will create a single header <code>igl.h</code> and a single cpp file <code>igl.cpp</code>.</p>
|
|
|
+
|
|
|
+<p>Alternatively, you can also compress everything into a single header file:</p>
|
|
|
+
|
|
|
+<pre><code>scripts/compress.sh igl.h
|
|
|
+</code></pre>
|
|
|
+
|
|
|
+<h3 id="benefitsofcompressed.h.cpppair">Benefits of compressed .h/.cpp pair</h3>
|
|
|
+
|
|
|
+<ul>
|
|
|
+<li><strong>Easy incorporation</strong>: This can be easily incorporated
|
|
|
+ into external projects.</li>
|
|
|
+</ul>
|
|
|
+
|
|
|
+<h3 id="drawbacksofcompressed.h.cpppair">Drawbacks of compressed .h/.cpp pair</h3>
|
|
|
+
|
|
|
+<ul>
|
|
|
+<li><p><strong>Hard to debug/edit</strong>: The compressed files are
|
|
|
+ automatically generated. They’re huge and should not be edited. Thus
|
|
|
+ debugging and editting are near impossible.</p></li>
|
|
|
+<li><p><strong>Compounded dependencies</strong>:
|
|
|
+ An immediate disadvantage of this
|
|
|
+ seems to be that even to use a single function (e.g.
|
|
|
+ <code>cotmatrix</code>), compiling and linking against
|
|
|
+ <code>igl.cpp</code> will require linking to all of <code>libigl</code>’s
|
|
|
+ dependencies (<code>OpenGL</code>, <code>GLUT</code>,
|
|
|
+ <code>AntTweakBar</code>, <code>BLAS</code>). However, because all
|
|
|
+ depencies other than Eigen should be encapsulated between
|
|
|
+ <code>#ifndef</code> guards (e.g. <code>#ifndef IGL_NO_OPENGL</code>, it
|
|
|
+ is possible to ignore certain functions that have such dependencies.</li>
|
|
|
+ <li><strong>Long compile:</strong> Compiling <code>igl.cpp</code> takes a long time and isn’t easily parallelized (no <code>make -j12</code> equivalent).</li>
|
|
|
+ </ul></p></li>
|
|
|
+</ul>
|
|
|
+
|
|
|
+<p>Here’s a tiny test example using <code>igl.h</code> and <code>igl.cpp</code>. Save the following in <code>test.cpp</code>:</p>
|
|
|
+
|
|
|
+<pre><code>#include <igl.h>
|
|
|
+#include <Eigen/Core>
|
|
|
+
|
|
|
+int main(int argc, char * argv[])
|
|
|
+{
|
|
|
+Eigen::MatrixXd V;
|
|
|
+Eigen::MatrixXi F;
|
|
|
+return (argc>=2 &amp;&amp; igl::read_triangle_mesh(argv[1],V,F)?0:1);
|
|
|
+}
|
|
|
+</code></pre>
|
|
|
+
|
|
|
+<p>Then compile <code>igl.cpp</code> with:</p>
|
|
|
+
|
|
|
+<pre><code>g++ -o igl.o -c igl.cpp -I/opt/local/include/eigen3 -DIGL_NO_OPENGL -DIGL_NO_ANTTWEAKBAR
|
|
|
+</code></pre>
|
|
|
+
|
|
|
+<p>Notice that we’re using <code>-DIGL_NO_OPENGL -DIGL_NO_ANTTWEAKBAR</code> to disable any libigl dependencies on OpenGL and AntTweakBar.</p>
|
|
|
+
|
|
|
+<p>Now compile <code>test.cpp</code> with:</p>
|
|
|
+
|
|
|
+<pre><code>g++ -g -I/opt/local/include/eigen3/ -I/usr/local/igl/libigl/ -L/usr/local/igl/libigl/ -ligl -DIGL_NO_OPENGL -DIGL_NO_ANTTWEAKBAR -o test
|
|
|
+</code></pre>
|
|
|
+
|
|
|
+<p>Try running it with:</p>
|
|
|
+
|
|
|
+<pre><code>./test path/to/mesh.obj
|
|
|
+</code></pre>
|
|
|
+
|
|
|
+<p>The following bash one-liner will find all source files that contain the string <code>OpenGL</code> but don’t contain and <code>IGL_NO_OPENGL</code> guard:</p>
|
|
|
+
|
|
|
+<pre><code>grep OpenGL `grep -L IGL_NO_OPENGL include/igl/*`
|
|
|
+</code></pre>
|
|
|
+
|
|
|
+<h3 id="optional">Optional</h3>
|
|
|
+
|
|
|
+<ul>
|
|
|
+<li>OpenGL (disable with <code>IGL_NO_OPENGL</code>)
|
|
|
+
|
|
|
+<ul>
|
|
|
+<li>OpenGL >= 4 (enable with <code>IGL_OPENGL_4</code>)</li>
|
|
|
+</ul></li>
|
|
|
+<li>AntTweakBar (disable with <code>IGL_NO_ANTTWEAKBAR</code>) Last tested 1.16 (see
|
|
|
+ <code>libigl/external/AntTweakBar</code>)</li>
|
|
|
+<li>GLEW Windows and Linux</li>
|
|
|
+<li>OpenMP</li>
|
|
|
+<li>libpng libiglpng extra only</li>
|
|
|
+<li>Mosek libiglmosek extra only</li>
|
|
|
+<li>Matlab libiglmatlab extra only</li>
|
|
|
+<li>boost libiglboost, libiglcgal extra only</li>
|
|
|
+<li>SSE/AVX libiglsvd3x3 extra only</li>
|
|
|
+<li>CGAL libiglcgal extra only
|
|
|
+
|
|
|
+<ul>
|
|
|
+<li>boost</li>
|
|
|
+<li>gmp</li>
|
|
|
+<li>mpfr</li>
|
|
|
+</ul></li>
|
|
|
+<li>CoMiSo libcomiso extra only</li>
|
|
|
+</ul>
|
|
|
+
|
|
|
+<h3 id="optionalincludedinexternal">Optional (included in external/)</h3>
|
|
|
+
|
|
|
+<ul>
|
|
|
+<li>TetGen libigltetgen extra only</li>
|
|
|
+<li>Embree libiglembree extra only</li>
|
|
|
+<li>tinyxml2 libiglxml extra only</li>
|
|
|
+<li>glfw libviewer extra only</li>
|
|
|
+<li>LIM liblim extra only</li>
|
|
|
+</ul>
|
|
|
+
|
|
|
+</body>
|
|
|
+</html>
|
Alec Jacobson