Merged branch 'dev_native' into lm_sla_supports_auto

Added igl library files

src/igl/circumradius.cpp

@@ -0,0 +1,26 @@
+// This file is part of libigl, a simple c++ geometry processing library.
+// 
+// Copyright (C) 2016 Alec Jacobson <alecjacobson@gmail.com>
+// 
+// This Source Code Form is subject to the terms of the Mozilla Public License 
+// v. 2.0. If a copy of the MPL was not distributed with this file, You can 
+// obtain one at http://mozilla.org/MPL/2.0/.
+#include "circumradius.h"
+#include "edge_lengths.h"
+#include "doublearea.h"
+template <
+  typename DerivedV, 
+  typename DerivedF,
+  typename DerivedR>
+IGL_INLINE void igl::circumradius(
+  const Eigen::PlainObjectBase<DerivedV> & V, 
+  const Eigen::PlainObjectBase<DerivedF> & F,
+  Eigen::PlainObjectBase<DerivedR> & R)
+{
+  Eigen::Matrix<typename DerivedV::Scalar,Eigen::Dynamic,3> l;
+  igl::edge_lengths(V,F,l);
+  DerivedR A;
+  igl::doublearea(l,0.,A);
+  // use formula: R=abc/(4*area) to compute the circum radius
+  R = l.col(0).array() * l.col(1).array() * l.col(2).array() / (2.0*A.array());
+}