Merged branch 'dev_native' into lm_sla_supports_auto

Added igl library files

src/igl/covariance_scatter_matrix.h

@@ -0,0 +1,38 @@
+// This file is part of libigl, a simple c++ geometry processing library.
+// 
+// Copyright (C) 2013 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/.
+#ifndef IGL_COVARIANCE_SCATTER_MATRIX_H
+#define IGL_COVARIANCE_SCATTER_MATRIX_H
+
+#include "igl_inline.h"
+#include "ARAPEnergyType.h"
+#include <Eigen/Dense>
+#include <Eigen/Sparse>
+ 
+namespace igl
+{
+  // Construct the covariance scatter matrix for a given arap energy
+  // Inputs:
+  //   V  #V by Vdim list of initial domain positions
+  //   F  #F by 3 list of triangle indices into V
+  //   energy  ARAPEnergyType enum value defining which energy is being used.
+  //     See ARAPEnergyType.h for valid options and explanations.
+  // Outputs:
+  //   CSM dim*#V/#F by dim*#V sparse matrix containing special laplacians along
+  //     the diagonal so that when multiplied by V gives covariance matrix
+  //     elements, can be used to speed up covariance matrix computation
+  IGL_INLINE void covariance_scatter_matrix(
+    const Eigen::MatrixXd & V, 
+    const Eigen::MatrixXi & F,
+    const ARAPEnergyType energy,
+    Eigen::SparseMatrix<double>& CSM);
+}
+
+#ifndef IGL_STATIC_LIBRARY
+#include "covariance_scatter_matrix.cpp"
+#endif
+#endif