PolyMeshT.hh

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//=============================================================================
//
//  CLASS PolyMeshT
//
//=============================================================================


#ifndef OPENMESH_POLYMESHT_HH
#define OPENMESH_POLYMESHT_HH


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


#include <OpenMesh/Core/System/config.h>
#include <OpenMesh/Core/Geometry/MathDefs.hh>
#include <OpenMesh/Core/Mesh/PolyConnectivity.hh>
#include <OpenMesh/Core/Mesh/FinalMeshItemsT.hh>
#include <OpenMesh/Core/Mesh/Tags.hh>
#include <vector>


//== NAMESPACES ===============================================================


namespace OpenMesh {

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


template <class Kernel>
class PolyMeshT : public Kernel
{
public:

  typedef PolyMeshT<Kernel>                   This;
  //--- item types ---

  static constexpr bool is_polymesh() { return true;  }
  static constexpr bool is_trimesh()  { return false; }
  using ConnectivityTag = PolyConnectivityTag;
  enum { IsPolyMesh = 1 };
  enum { IsTriMesh  = 0 };


  typedef typename Kernel::Scalar    Scalar;
  typedef typename Kernel::Point     Point;
  typedef typename Kernel::Normal    Normal;
  typedef typename Kernel::Color     Color;
  typedef typename Kernel::TexCoord1D  TexCoord1D;
  typedef typename Kernel::TexCoord2D  TexCoord2D;
  typedef typename Kernel::TexCoord3D  TexCoord3D;
  typedef typename Kernel::Vertex    Vertex;
  typedef typename Kernel::Halfedge  Halfedge;
  typedef typename Kernel::Edge      Edge;
  typedef typename Kernel::Face      Face;

  //--- handle types ---

  typedef typename Kernel::VertexHandle       VertexHandle;
  typedef typename Kernel::HalfedgeHandle     HalfedgeHandle;
  typedef typename Kernel::EdgeHandle         EdgeHandle;
  typedef typename Kernel::FaceHandle         FaceHandle;



  typedef typename Kernel::VertexIter                 VertexIter;
  typedef typename Kernel::HalfedgeIter               HalfedgeIter;
  typedef typename Kernel::EdgeIter                   EdgeIter;
  typedef typename Kernel::FaceIter                   FaceIter;

  typedef typename Kernel::ConstVertexIter            ConstVertexIter;
  typedef typename Kernel::ConstHalfedgeIter          ConstHalfedgeIter;
  typedef typename Kernel::ConstEdgeIter              ConstEdgeIter;
  typedef typename Kernel::ConstFaceIter              ConstFaceIter;

  //--- circulators ---

  typedef typename Kernel::VertexVertexIter          VertexVertexIter;
  typedef typename Kernel::VertexOHalfedgeIter       VertexOHalfedgeIter;
  typedef typename Kernel::VertexIHalfedgeIter       VertexIHalfedgeIter;
  typedef typename Kernel::VertexEdgeIter            VertexEdgeIter;
  typedef typename Kernel::VertexFaceIter            VertexFaceIter;
  typedef typename Kernel::FaceVertexIter            FaceVertexIter;
  typedef typename Kernel::FaceHalfedgeIter          FaceHalfedgeIter;
  typedef typename Kernel::FaceEdgeIter              FaceEdgeIter;
  typedef typename Kernel::FaceFaceIter              FaceFaceIter;

  typedef typename Kernel::ConstVertexVertexIter     ConstVertexVertexIter;
  typedef typename Kernel::ConstVertexOHalfedgeIter  ConstVertexOHalfedgeIter;
  typedef typename Kernel::ConstVertexIHalfedgeIter  ConstVertexIHalfedgeIter;
  typedef typename Kernel::ConstVertexEdgeIter       ConstVertexEdgeIter;
  typedef typename Kernel::ConstVertexFaceIter       ConstVertexFaceIter;
  typedef typename Kernel::ConstFaceVertexIter       ConstFaceVertexIter;
  typedef typename Kernel::ConstFaceHalfedgeIter     ConstFaceHalfedgeIter;
  typedef typename Kernel::ConstFaceEdgeIter         ConstFaceEdgeIter;
  typedef typename Kernel::ConstFaceFaceIter         ConstFaceFaceIter;


  // --- constructor/destructor
  PolyMeshT() {}
  template<typename T>
  explicit PolyMeshT(const T& t) : Kernel(t) {}
  virtual ~PolyMeshT() {}

  // --- creation ---

  inline VertexHandle new_vertex()
  { return Kernel::new_vertex(); }

  inline VertexHandle new_vertex(const Point& _p)
  {
    VertexHandle vh(Kernel::new_vertex());
    this->set_point(vh, _p);
    return vh;
  }

  inline VertexHandle new_vertex_dirty(const Point& _p)
  {
    VertexHandle vh(Kernel::new_vertex_dirty());
    this->set_point(vh, _p);
    return vh;
  }

  inline VertexHandle add_vertex(const Point& _p)
  { return new_vertex(_p); }

  inline VertexHandle add_vertex_dirty(const Point& _p)
  { return new_vertex_dirty(_p); }

  // --- normal vectors ---


  void update_normals();

  void update_normal(FaceHandle _fh)
  { this->set_normal(_fh, calc_face_normal(_fh)); }

  void update_face_normals();

  virtual Normal calc_face_normal(FaceHandle _fh) const;

  Normal calc_face_normal(const Point& _p0, const Point& _p1,
                                            const Point& _p2) const;
  void calc_face_centroid(FaceHandle _fh, Point& _pt) const {
      _pt = calc_face_centroid(_fh);
  }

  Point calc_face_centroid(FaceHandle _fh) const;

  void update_normal(HalfedgeHandle _heh, const double _feature_angle = 0.8)
  { this->set_normal(_heh, calc_halfedge_normal(_heh,_feature_angle)); }

  void update_halfedge_normals(const double _feature_angle = 0.8);

  virtual Normal calc_halfedge_normal(HalfedgeHandle _heh, const double _feature_angle = 0.8) const;


  bool is_estimated_feature_edge(HalfedgeHandle _heh, const double _feature_angle) const;

  void update_normal(VertexHandle _vh)
  { this->set_normal(_vh, calc_vertex_normal(_vh)); }

  void update_vertex_normals();

  Normal calc_vertex_normal(VertexHandle _vh) const;

  void calc_vertex_normal_fast(VertexHandle _vh, Normal& _n) const;
  void calc_vertex_normal_correct(VertexHandle _vh, Normal& _n) const;
  void calc_vertex_normal_loop(VertexHandle _vh, Normal& _n) const;



  // --- Geometry API - still in development ---

  void calc_edge_vector(EdgeHandle _eh, Normal& _edge_vec) const
  {
    _edge_vec = calc_edge_vector(_eh);
  }

  Normal calc_edge_vector(EdgeHandle _eh) const
  {
    return calc_edge_vector(this->halfedge_handle(_eh,0));
  }

  void calc_edge_vector(HalfedgeHandle _heh, Normal& _edge_vec) const
  {
    _edge_vec = calc_edge_vector(_heh);
  }

  Normal calc_edge_vector(HalfedgeHandle _heh) const
  {
    return this->point(this->to_vertex_handle(_heh)) -
            this->point(this->from_vertex_handle(_heh));
  }

  // Calculates the length of the edge _eh
  Scalar calc_edge_length(EdgeHandle _eh) const
  { return calc_edge_length(this->halfedge_handle(_eh,0)); }

  Scalar calc_edge_length(HalfedgeHandle _heh) const
  { return (Scalar)sqrt(calc_edge_sqr_length(_heh)); }

  Scalar calc_edge_sqr_length(EdgeHandle _eh) const
  { return calc_edge_sqr_length(this->halfedge_handle(_eh,0)); }

  Scalar calc_edge_sqr_length(HalfedgeHandle _heh) const
  {
    Normal edge_vec;
    calc_edge_vector(_heh, edge_vec);
    return sqrnorm(edge_vec);
  }

  Point calc_edge_midpoint(HalfedgeHandle _heh) const
  {
    VertexHandle vh0 = this->from_vertex_handle(_heh);
    VertexHandle vh1 = this->to_vertex_handle(_heh);
    return 0.5 * (this->point(vh0) + this->point(vh1));
  }

  Point calc_edge_midpoint(EdgeHandle _eh) const
  {
    return calc_edge_midpoint(this->halfedge_handle(_eh, 0));
  }

  void calc_sector_vectors(HalfedgeHandle _in_heh, Normal& _vec0, Normal& _vec1) const
  {
    calc_edge_vector(this->next_halfedge_handle(_in_heh), _vec0);//p2 - p1
    calc_edge_vector(this->opposite_halfedge_handle(_in_heh), _vec1);//p0 - p1
  }

  Scalar calc_sector_angle(HalfedgeHandle _in_heh) const
  {
    Normal v0, v1;
    calc_sector_vectors(_in_heh, v0, v1);
    Scalar denom = norm(v0)*norm(v1);
    if ( denom == Scalar(0))
    {
      return 0;
    }
    Scalar cos_a = dot(v0 , v1) / denom;
    if (this->is_boundary(_in_heh))
    {//determine if the boundary sector is concave or convex
      FaceHandle fh(this->face_handle(this->opposite_halfedge_handle(_in_heh)));
      Normal f_n(calc_face_normal(fh));//this normal is (for convex fh) OK
      Scalar sign_a = dot(cross(v0, v1), f_n);
      return angle(cos_a, sign_a);
    }
    else
    {
      return acos(sane_aarg(cos_a));
    }
  }

  // calculate the cos and the sin of angle <(_in_heh,next_halfedge(_in_heh))
  /*
  void calc_sector_angle_cos_sin(HalfedgeHandle _in_heh, Scalar& _cos_a, Scalar& _sin_a) const
  {
    Normal in_vec, out_vec;
    calc_edge_vector(_in_heh, in_vec);
    calc_edge_vector(next_halfedge_handle(_in_heh), out_vec);
    Scalar denom = norm(in_vec)*norm(out_vec);
    if (is_zero(denom))
    {
      _cos_a = 1;
      _sin_a = 0;
    }
    else
    {
      _cos_a = dot(in_vec, out_vec)/denom;
      _sin_a = norm(cross(in_vec, out_vec))/denom;
    }
  }
  */
  void calc_sector_normal(HalfedgeHandle _in_heh, Normal& _sector_normal) const
  {
    Normal vec0, vec1;
    calc_sector_vectors(_in_heh, vec0, vec1);
    _sector_normal = cross(vec0, vec1);//(p2-p1)^(p0-p1)
  }

  Scalar calc_sector_area(HalfedgeHandle _in_heh) const
  {
    Normal sector_normal;
    calc_sector_normal(_in_heh, sector_normal);
    return norm(sector_normal)/2;
  }

  Scalar calc_dihedral_angle_fast(HalfedgeHandle _heh) const
  {
    // Make sure that we have face normals on the mesh
    assert(Kernel::has_face_normals());

    if (this->is_boundary(this->edge_handle(_heh)))
    {//the dihedral angle at a boundary edge is 0
      return 0;
    }
    const Normal& n0 = this->normal(this->face_handle(_heh));
    const Normal& n1 = this->normal(this->face_handle(this->opposite_halfedge_handle(_heh)));
    Normal he;
    calc_edge_vector(_heh, he);
    Scalar da_cos = dot(n0, n1);
    //should be normalized, but we need only the sign
    Scalar da_sin_sign = dot(cross(n0, n1), he);
    return angle(da_cos, da_sin_sign);
  }

  Scalar calc_dihedral_angle_fast(EdgeHandle _eh) const
  { return calc_dihedral_angle_fast(this->halfedge_handle(_eh,0)); }

  // calculates the dihedral angle on the halfedge _heh
  Scalar calc_dihedral_angle(HalfedgeHandle _heh) const
  {
    if (this->is_boundary(this->edge_handle(_heh)))
    {//the dihedral angle at a boundary edge is 0
      return 0;
    }
    Normal n0, n1, he;
    calc_sector_normal(_heh, n0);
    calc_sector_normal(this->opposite_halfedge_handle(_heh), n1);
    calc_edge_vector(_heh, he);
    Scalar denom = norm(n0)*norm(n1);
    if (denom == Scalar(0))
    {
      return 0;
    }
    Scalar da_cos = dot(n0, n1)/denom;
    //should be normalized, but we need only the sign
    Scalar da_sin_sign = dot(cross(n0, n1), he);
    return angle(da_cos, da_sin_sign);
  }

  // calculates the dihedral angle on the edge _eh
  Scalar calc_dihedral_angle(EdgeHandle _eh) const
  { return calc_dihedral_angle(this->halfedge_handle(_eh,0)); }

  unsigned int find_feature_edges(Scalar _angle_tresh = OpenMesh::deg_to_rad(44.0));
  // --- misc ---

  inline void split(FaceHandle _fh, const Point& _p)
  { Kernel::split(_fh, add_vertex(_p)); }

  inline void split(FaceHandle _fh, VertexHandle _vh)
  { Kernel::split(_fh, _vh); }

  inline void split(EdgeHandle _eh, const Point& _p)
  { Kernel::split_edge(_eh, add_vertex(_p)); }

  inline void split(EdgeHandle _eh, VertexHandle _vh)
  { Kernel::split_edge(_eh, _vh); }
  
private:
  struct PointIs3DTag {};
  struct PointIsNot3DTag {};
  Normal calc_face_normal_impl(FaceHandle, PointIs3DTag) const;
  Normal calc_face_normal_impl(FaceHandle, PointIsNot3DTag) const;
  Normal calc_face_normal_impl(const Point&, const Point&, const Point&, PointIs3DTag) const;
  Normal calc_face_normal_impl(const Point&, const Point&, const Point&, PointIsNot3DTag) const;
};

template<typename LHS, typename KERNEL>
LHS mesh_cast(PolyMeshT<KERNEL> &rhs) {
    return MeshCast<LHS, PolyMeshT<KERNEL>&>::cast(rhs);
}

template<typename LHS, typename KERNEL>
LHS mesh_cast(PolyMeshT<KERNEL> *rhs) {
    return MeshCast<LHS, PolyMeshT<KERNEL>*>::cast(rhs);
}

template<typename LHS, typename KERNEL>
const LHS mesh_cast(const PolyMeshT<KERNEL> &rhs) {
    return MeshCast<LHS, const PolyMeshT<KERNEL>&>::cast(rhs);
}

template<typename LHS, typename KERNEL>
const LHS mesh_cast(const PolyMeshT<KERNEL> *rhs) {
    return MeshCast<LHS, const PolyMeshT<KERNEL>*>::cast(rhs);
}

//=============================================================================
} // namespace OpenMesh
//=============================================================================
#if defined(OM_INCLUDE_TEMPLATES) && !defined(OPENMESH_POLYMESH_C)
#  define OPENMESH_POLYMESH_TEMPLATES
#  include "PolyMeshT_impl.hh"
#endif
//=============================================================================
#endif // OPENMESH_POLYMESHT_HH defined
//=============================================================================