AdaptiveRemesherT_impl.hh

/*===========================================================================*\
*                                                                            *
*                              OpenFlipper                                   *
 *           Copyright (c) 2001-2015, RWTH-Aachen University                 *
 *           Department of Computer Graphics and Multimedia                  *
 *                          All rights reserved.                             *
 *                            www.openflipper.org                            *
 *                                                                           *
 *---------------------------------------------------------------------------*
 * This file is part of OpenFlipper.                                         *
 *---------------------------------------------------------------------------*
 *                                                                           *
 * Redistribution and use in source and binary forms, with or without        *
 * modification, are permitted provided that the following conditions        *
 * are met:                                                                  *
 *                                                                           *
 * 1. Redistributions of source code must retain the above copyright notice, *
 *    this list of conditions and the following disclaimer.                  *
 *                                                                           *
 * 2. Redistributions in binary form must reproduce the above copyright      *
 *    notice, this list of conditions and the following disclaimer in the    *
 *    documentation and/or other materials provided with the distribution.   *
 *                                                                           *
 * 3. Neither the name of the copyright holder nor the names of its          *
 *    contributors may be used to endorse or promote products derived from   *
 *    this software without specific prior written permission.               *
 *                                                                           *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS       *
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED *
 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A           *
 * PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER *
 * OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,  *
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,       *
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR        *
 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF    *
 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING      *
 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS        *
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.              *
*                                                                            *
\*===========================================================================*/


//=============================================================================
//
//  CLASS AdaptiveRemesherT - IMPLEMENTATION
//
//=============================================================================

#define ADAPTIVE_REMESHERT_C


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

#include "AdaptiveRemesherT.hh"
#include <ACG/Geometry/Algorithms.hh>
#include "DiffGeoT.hh"


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

namespace Remeshing {


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


template <class Mesh>
void
AdaptiveRemesherT<Mesh>::
init_reference()
{
  Base::init_reference();

  // compute max curvature on both meshes
  Base::refmesh_->add_property(refcurv_);
  compute_curvature(*Base::refmesh_, refcurv_);
  Base::mesh_.add_property(curvature_);
  compute_curvature(Base::mesh_, curvature_);
}


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


template <class Mesh>
void
AdaptiveRemesherT<Mesh>::
project_to_reference(typename Mesh::VertexHandle _vh) const
{
  typename Mesh::Point          p = Base::mesh_.point(_vh);
  typename Mesh::FaceHandle     fh = Base::bsp_->nearest(p).handle;

  if ( ! fh.is_valid() ) {
    std::cerr << "AdaptiveRemesherT: Projection, invalid face handle" << std::endl;
    return;
  }

  typename Mesh::CFVIter        fv_it = Base::refmesh_->cfv_iter(fh);
          

  const typename Mesh::Point&   p0 = Base::refmesh_->point(*fv_it);
  typename Mesh::Normal         n0 = Base::refmesh_->normal(*fv_it);
  typename Mesh::Scalar         c0 = Base::refmesh_->property(refcurv_, *fv_it);
  const typename Mesh::Point&   p1 = Base::refmesh_->point(*(++fv_it));
  typename Mesh::Normal         n1 = Base::refmesh_->normal(*fv_it);
  typename Mesh::Scalar         c1 = Base::refmesh_->property(refcurv_, *fv_it);
  const typename Mesh::Point&   p2 = Base::refmesh_->point(*(++fv_it));
  typename Mesh::Normal         n2 = Base::refmesh_->normal(*fv_it);
  typename Mesh::Scalar         c2 = Base::refmesh_->property(refcurv_, *fv_it);


  // project
  //Geometry::dist_point_triangle(p, p0, p1, p2, p);
  ACG::Geometry::distPointTriangle<typename Mesh::Point>(p, p0, p1, p2, p);
  Base::mesh_.set_point(_vh, p);


  // get barycentric coordinates
  if (!ACG::Geometry::baryCoord(p, p0, p1, p2, p))
    p[0] = p[1] = p[2] = 1.0/3.0;


  // interpolate normal
  typename Mesh::Normal n;
  n  = (n0 *= p[0]);
  n += (n1 *= p[1]);
  n += (n2 *= p[2]);
  n.normalize();
  Base::mesh_.set_normal(_vh, n);


  // interpolate curvature
  typename Mesh::Scalar c;
  c  = (c0 *= p[0]);
  c += (c1 *= p[1]);
  c += (c2 *= p[2]);
  Base::mesh_.property(curvature_, _vh) = c;
}


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


template <class Mesh>
void
AdaptiveRemesherT<Mesh>::
compute_curvature(Mesh& _mesh, OpenMesh::VPropHandleT<Scalar> _ph)
{
  DiffGeoT<Mesh> diffgeo(_mesh);
  diffgeo.compute(2);

  typename Mesh::VIter  v_it, v_end(_mesh.vertices_end());

  for (v_it=_mesh.vertices_begin(); v_it!=v_end; ++v_it)
    _mesh.property(_ph, *v_it) = diffgeo.max_curvature(*v_it);
}


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


template <class Mesh>
void
AdaptiveRemesherT<Mesh>::
remesh(Scalar        _error,
       Scalar        _emin,
       Scalar        _emax,
       unsigned int  _iters,
       bool          _use_projection,
       Selection     _selection)
{
  // set thesholds
  error_ = _error;
  emin_  = _emin;
  emax_  = _emax;

  // do it
  Base::remesh(_iters, 0, _use_projection, _selection);

  // free curvature property (refmesh has been deleted already)
  Base::mesh_.remove_property(curvature_);
}


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


template <class Mesh>
bool
AdaptiveRemesherT<Mesh>::
is_too_long(VertexHandle v0, VertexHandle v1) const
{
  const Point& p0 = Base::mesh_.point(v0);
  const Point& p1 = Base::mesh_.point(v1);

  Scalar c = 0.5 * ( Base::mesh_.property(curvature_, v0) +
                     Base::mesh_.property(curvature_, v1) );

  Scalar e = 2.0/c*error_ - error_*error_;
  e = (e <= 0.0 ? error_ : 2.0*sqrt(e));

  if (e<emin_) e=emin_; else if (e>emax_) e=emax_;
  Scalar emax = 4.0/3.0 * e;

  return ((p0 - p1).sqrnorm() > emax*emax);
}


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


template <class Mesh>
bool
AdaptiveRemesherT<Mesh>::
is_too_short(VertexHandle v0, VertexHandle v1) const
{
  const Point& p0 = Base::mesh_.point(v0);
  const Point& p1 = Base::mesh_.point(v1);

  Scalar c = 0.5 * ( Base::mesh_.property(curvature_, v0) +
                     Base::mesh_.property(curvature_, v1) );

  Scalar e = 2.0/c*error_ - error_*error_;
  e = (e <= 0.0 ? error_ : 2.0*sqrt(e));

  if (e<emin_) e=emin_; else if (e>emax_) e=emax_;
  Scalar emin = 4.0/5.0 * e;

  return ((p0 - p1).sqrnorm() < emin*emin);
}


//=============================================================================
} // namespace Remeshing
//=============================================================================