TriangleBSPT.hh

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//=============================================================================
//
//  CLASS TriangleBSPT
//
//=============================================================================

#pragma once


//== INCLUDES =================================================================

#include "BSPTreeNode.hh"
#include "TriangleBSPCoreT.hh"
#include "BSPImplT.hh"

#include <list>
//== CLASS DEFINITION =========================================================

template <class BSPTraits>
class TriangleBSPT : public BSPImplT< TriangleBSPCoreT<BSPTraits> >
{
public:
  typedef BSPImplT< TriangleBSPCoreT<BSPTraits> > Base;
  typedef typename Base::Scalar Scalar;
  TriangleBSPT(const BSPTraits& _traits,
               const Scalar& _infinity = std::numeric_limits<Scalar>::infinity()) : Base(_traits, _infinity) {}
};

//== CLASS DEFINITION =========================================================

template <class Mesh, class SpecificTraits>
class OVMOMCommonTriangleBSPTraits : public SpecificTraits
{
public:

    typedef typename SpecificTraits::Point    Point;
    typedef typename SpecificTraits::Handle   Handle;
    typedef typename Point::value_type        Scalar;
    typedef std::vector<Handle>               Handles;
    typedef typename Handles::iterator        HandleIter;
    typedef TreeNode<SpecificTraits>          Node;

    explicit OVMOMCommonTriangleBSPTraits(const Mesh& _mesh) : SpecificTraits(_mesh) {}

    Scalar sqrdist(const Handle _h, const Point& _p) const
    {
      Point p0, p1, p2, q;
      this->points(_h, p0, p1, p2);
      return ACG::Geometry::distPointTriangleSquaredStable(_p, p0, p1, p2, q);
    }

    void calculateBoundingBox(Node* _node, Point& median, int& axis)
    {
      //determine splitting axis
      HandleIter it_h;
      Point p0, p1, p2, bb_min, bb_max;
      bb_min.vectorize(std::numeric_limits<typename Point::value_type>::infinity());
      bb_max.vectorize(-std::numeric_limits<typename Point::value_type>::infinity());
      std::list<Point> vertices;

      for (it_h = _node->begin(); it_h != _node->end(); ++it_h) {
        this->points(*it_h, p0, p1, p2);
        /*
         bb_min.minimize(p0);
         bb_min.minimize(p1);
         bb_min.minimize(p2);
         bb_max.maximize(p0);
         bb_max.maximize(p1);
         bb_max.maximize(p2);*/

        vertices.push_back(p0);
        vertices.push_back(p1);
        vertices.push_back(p2);
      }
      bb_min = _node->bb_min;
      bb_max = _node->bb_max;

      // split longest side of bounding box
      Point bb = bb_max - bb_min;
      Scalar length = bb[0];
      axis = 0;
      if (bb[1] > length)
        length = bb[(axis = 1)];
      if (bb[2] > length)
        length = bb[(axis = 2)];

      //calculate the median value in axis-direction
      switch (axis) {
        case 0:
          vertices.sort(x_sort());
          break;
        case 1:
          vertices.sort(y_sort());
          break;
        case 2:
          vertices.sort(z_sort());
          break;
      }
      vertices.unique(); 

      size_t size = vertices.size();
      typename std::list<Point>::iterator it_v;
      it_v = vertices.begin();
      std::advance(it_v, size / 2);
      median = *it_v;

    }

    void calculateBoundingBoxRoot(Node* _node)
    {
      HandleIter it;
      Point p0, p1, p2, bb_min, bb_max;
      bb_min.vectorize(FLT_MAX);
      bb_max.vectorize(-FLT_MAX);
      for (it = _node->begin(); it != _node->end(); ++it) {
        this->points(*it, p0, p1, p2);
        bb_min.minimize(p0);
        bb_min.minimize(p1);
        bb_min.minimize(p2);
        bb_max.maximize(p0);
        bb_max.maximize(p1);
        bb_max.maximize(p2);
      }
      _node->bb_min = bb_min;
      _node->bb_max = bb_max;
    }

private:
    //functors for sorting in different directions
    struct x_sort { bool operator()(const Point& first, const Point& second) { return (first[0] < second[0]); }  };
    struct y_sort { bool operator()(const Point& first, const Point& second) { return (first[1] < second[1]); }  };
    struct z_sort { bool operator()(const Point& first, const Point& second) { return (first[2] < second[2]); }  };
};


//== CLASS DEFINITION =========================================================

template <class Mesh>
class OMSpecificTriangleBSPTraits
{
public:
  typedef typename Mesh::Point        Point;
  typedef typename Mesh::FaceHandle   Handle;
  typedef typename Mesh::VertexHandle VertexHandle;
  explicit OMSpecificTriangleBSPTraits(const Mesh& _mesh) : mesh_(_mesh) {}

  inline void points(const Handle &_h, Point& _p0, Point& _p1, Point& _p2) const
  {
    const auto &mesh = this->mesh_;
    typename Mesh::CFVIter fv_it(mesh.cfv_iter(_h));
    _p0 = mesh.point(*fv_it);
    ++fv_it;
    _p1 = mesh.point(*fv_it);
    ++fv_it;
    _p2 = mesh.point(*fv_it);
  }
protected:
    const Mesh& mesh_;
};

template<class Mesh>
using OpenMeshTriangleBSPTraits = OVMOMCommonTriangleBSPTraits<Mesh, OMSpecificTriangleBSPTraits<Mesh>>;


//== CLASS DEFINITION =========================================================
template <class Mesh>
class OpenMeshTriangleBSPT
  : public TriangleBSPT<OpenMeshTriangleBSPTraits<Mesh> >
{
public:
  typedef OpenMeshTriangleBSPTraits<Mesh>  Traits;
  typedef TriangleBSPT<Traits>             Base;
  typedef typename Traits::Scalar Scalar;
  OpenMeshTriangleBSPT(const Mesh& _mesh,
                       const Scalar& _infinity = std::numeric_limits<Scalar>::infinity())
      : Base(Traits(_mesh), _infinity) {}
};


#if (defined ENABLE_POLYHEDRALMESH_SUPPORT) \
    || (defined ENABLE_HEXAHEDRALMESH_SUPPORT) \
    || (defined ENABLE_TETRAHEDRALMESH_SUPPORT)

#include <OpenVolumeMesh/Core/PropertyHandles.hh>
//== CLASS DEFINITION =========================================================

// Make sure all faces of the mesh have valence 3.
template <class Mesh>
class OVMSpecificTriangleBSPTraits
{
public:
  typedef typename Mesh::PointT        Point;
  typedef OpenVolumeMesh::FaceHandle   Handle;
  typedef OpenVolumeMesh::VertexHandle VertexHandle;
  explicit OVMSpecificTriangleBSPTraits(const Mesh& _mesh) : mesh_(_mesh) {}

  inline void points(const Handle &_h, Point& _p0, Point& _p1, Point& _p2) const
  {
    const auto &mesh = this->mesh_;
    assert(mesh.valence(_h) == 3);
    auto hfv_it (mesh.hfv_iter(mesh.halfface_handle(_h, 0)));
    _p0 = mesh.vertex(*hfv_it++);
    _p1 = mesh.vertex(*hfv_it++);
    _p2 = mesh.vertex(*hfv_it++);
  }
protected:
    const Mesh& mesh_;
};


template<class Mesh>
using OpenVolumeMeshTriangleBSPTraits = OVMOMCommonTriangleBSPTraits<Mesh, OVMSpecificTriangleBSPTraits<Mesh>>;

//== CLASS DEFINITION =========================================================
template <class Mesh>
class OpenVolumeMeshTriangleBSPT
  : public TriangleBSPT<OpenVolumeMeshTriangleBSPTraits<Mesh> >
{
public:
  typedef OpenVolumeMeshTriangleBSPTraits<Mesh>  Traits;
  typedef TriangleBSPT<Traits>                   Base;
  typedef typename Traits::Scalar Scalar;
  OpenVolumeMeshTriangleBSPT(const Mesh& _mesh,
                       const Scalar& _infinity = std::numeric_limits<Scalar>::infinity())
      : Base(Traits(_mesh), _infinity) {}
};

#endif