Refactor folder (#10475)

Move many third-party components' source codes from the src folder to a new folder called deps_src. The goal is to make the code structure clearer and easier to navigate.

deps_src/libigl/igl/random_dir.h

@@ -0,0 +1,31 @@
+// 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_RANDOM_DIR_H
+#define IGL_RANDOM_DIR_H
+#include "igl_inline.h"
+
+#include <Eigen/Core>
+
+namespace igl
+{
+  // Generate a uniformly random unit direction in 3D, return as vector
+  IGL_INLINE Eigen::Vector3d random_dir();
+  // Generate n stratified uniformly random unit directions in 3d, return as rows
+  // of an n by 3 matrix
+  //
+  // Inputs:
+  //   n  number of directions
+  // Return n by 3 matrix of random directions
+  IGL_INLINE Eigen::MatrixXd random_dir_stratified(const int n);
+}
+
+#ifndef IGL_STATIC_LIBRARY
+#  include "random_dir.cpp"
+#endif
+
+#endif