update bundled_deps

bundled_deps/libigl/igl/octree.h

@@ -0,0 +1,62 @@
+// This file is part of libigl, a simple c++ geometry processing library.
+//
+// Copyright (C) 2018 Gavin Barill <gavinpcb@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_OCTREE
+#define IGL_OCTREE
+#include "igl_inline.h"
+#include <Eigen/Core>
+#include <vector>
+
+
+
+
+namespace igl
+{
+  // Given a set of 3D points P, generate data structures for a pointerless
+  // octree. Each cell stores its points, children, center location and width.
+  // Our octree is not dense. We use the following rule: if the current cell
+  // has any number of points, it will have all 8 children. A leaf cell will
+  // have -1's as its list of child indices.
+  //
+  // We use a binary numbering of children. Treating the parent cell's center
+  // as the origin, we number the octants in the following manner:
+  // The first bit is 1 iff the octant's x coordinate is positive
+  // The second bit is 1 iff the octant's y coordinate is positive
+  // The third bit is 1 iff the octant's z coordinate is positive
+  //
+  // For example, the octant with negative x, positive y, positive z is:
+  // 110 binary = 6 decimal
+  //
+  // Inputs:
+  //   P  #P by 3 list of point locations
+  //
+  // Outputs:
+  //   point_indices  a vector of vectors, where the ith entry is a vector of
+  //                  the indices into P that are the ith octree cell's points
+  //   CH     #OctreeCells by 8, where the ith row is the indices of
+  //          the ith octree cell's children
+  //   CN     #OctreeCells by 3, where the ith row is a 3d row vector
+  //          representing the position of the ith cell's center
+  //   W      #OctreeCells, a vector where the ith entry is the width
+  //          of the ith octree cell
+  //
+  template <typename DerivedP, typename IndexType, typename DerivedCH,
+  typename DerivedCN, typename DerivedW>
+  IGL_INLINE void octree(const Eigen::MatrixBase<DerivedP>& P,
+    std::vector<std::vector<IndexType> > & point_indices,
+    Eigen::PlainObjectBase<DerivedCH>& CH,
+    Eigen::PlainObjectBase<DerivedCN>& CN,
+    Eigen::PlainObjectBase<DerivedW>& W);
+}
+
+#ifndef IGL_STATIC_LIBRARY
+#  include "octree.cpp"
+#endif
+
+#endif
+