JacobiLaplaceSmootherT.cc 6.95 KB
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/*===========================================================================*\
 *                                                                           *
 *                               OpenMesh                                    *
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 *      Copyright (C) 2001-2011 by Computer Graphics Group, RWTH Aachen      *
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 *                           www.openmesh.org                                *
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 *---------------------------------------------------------------------------* 
 *  This file is part of OpenMesh.                                           *
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/*===========================================================================*\
 *                                                                           *             
 *   $Revision$                                                         *
 *   $Date$                   *
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\*===========================================================================*/
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/** \file JacobiLaplaceSmootherT.cc
    
 */

//=============================================================================
//
//  CLASS JacobiLaplaceSmootherT - IMPLEMENTATION
//
//=============================================================================

#define OPENMESH_JACOBI_LAPLACE_SMOOTHERT_C

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

#include <OpenMesh/Tools/Smoother/JacobiLaplaceSmootherT.hh>


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


namespace OpenMesh {
namespace Smoother {


//== IMPLEMENTATION ========================================================== 


template <class Mesh>
void
JacobiLaplaceSmootherT<Mesh>::
smooth(unsigned int _n)
{
  if (Base::continuity() > Base::C0)
  {
    Base::mesh_.add_property(umbrellas_);
    if (Base::continuity() > Base::C1)
      Base::mesh_.add_property(squared_umbrellas_);
  }

  LaplaceSmootherT<Mesh>::smooth(_n);

  if (Base::continuity() > Base::C0)
  {
    Base::mesh_.remove_property(umbrellas_);
    if (Base::continuity() > Base::C1)
      Base::mesh_.remove_property(squared_umbrellas_);
  }
}


//-----------------------------------------------------------------------------


template <class Mesh>
void
JacobiLaplaceSmootherT<Mesh>::
compute_new_positions_C0()
{
  typename Mesh::VertexIter  v_it, v_end(Base::mesh_.vertices_end());
  typename Mesh::CVVIter     vv_it;
  typename Mesh::Normal      u, p, zero(0,0,0);
  typename Mesh::Scalar      w;

  for (v_it=Base::mesh_.vertices_begin(); v_it!=v_end; ++v_it)
  {
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    if (this->is_active(v_it))
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    {
      // compute umbrella
      u = zero;
      for (vv_it=Base::mesh_.cvv_iter(v_it); vv_it; ++vv_it)
      {
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        w = this->weight(Base::mesh_.edge_handle(vv_it.current_halfedge_handle()));
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        u += vector_cast<typename Mesh::Normal>(Base::mesh_.point(vv_it)) * w;
      }
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      u *= this->weight(v_it);
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      u -= vector_cast<typename Mesh::Normal>(Base::mesh_.point(v_it));

      // damping
      u *= 0.5;
    
      // store new position
      p  = vector_cast<typename Mesh::Normal>(Base::mesh_.point(v_it));
      p += u;
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      this->set_new_position(v_it, p);
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    }
  }
}


//-----------------------------------------------------------------------------


template <class Mesh>
void
JacobiLaplaceSmootherT<Mesh>::
compute_new_positions_C1()
{
  typename Mesh::VertexIter  v_it, v_end(Base::mesh_.vertices_end());
  typename Mesh::CVVIter     vv_it;
  typename Mesh::Normal      u, uu, p, zero(0,0,0);
  typename Mesh::Scalar      w, diag;


  // 1st pass: compute umbrellas
  for (v_it=Base::mesh_.vertices_begin(); v_it!=v_end; ++v_it)
  {
    u = zero;
    for (vv_it=Base::mesh_.cvv_iter(v_it); vv_it; ++vv_it)
    {
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      w  = this->weight(Base::mesh_.edge_handle(vv_it.current_halfedge_handle()));
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      u -= vector_cast<typename Mesh::Normal>(Base::mesh_.point(vv_it))*w;
    }
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    u *= this->weight(v_it);
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    u += vector_cast<typename Mesh::Normal>(Base::mesh_.point(v_it));

    Base::mesh_.property(umbrellas_, v_it) = u;
  }


  // 2nd pass: compute updates
  for (v_it=Base::mesh_.vertices_begin(); v_it!=v_end; ++v_it)
  {
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    if (this->is_active(v_it))
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    {
      uu   = zero;
      diag = 0.0;   
      for (vv_it=Base::mesh_.cvv_iter(v_it); vv_it; ++vv_it)
      {
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	w     = this->weight(Base::mesh_.edge_handle(vv_it.current_halfedge_handle()));
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	uu   -= Base::mesh_.property(umbrellas_, vv_it);
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	diag += (w * this->weight(vv_it) + 1.0) * w;
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      }
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      uu   *= this->weight(v_it);
      diag *= this->weight(v_it);
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      uu   += Base::mesh_.property(umbrellas_, v_it);
      if (diag) uu *= 1.0/diag;

      // damping
      uu *= 0.25;
    
      // store new position
      p  = vector_cast<typename Mesh::Normal>(Base::mesh_.point(v_it));
      p -= uu;
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      this->set_new_position(v_it, p);
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    }
  }
}


//=============================================================================
} // namespace Smoother
} // namespace OpenMesh
//=============================================================================