MeshRepairPlugin.cc 32.1 KB
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/*===========================================================================*\
*                                                                            *
*                              OpenFlipper                                   *
*      Copyright (C) 2001-2011 by Computer Graphics Group, RWTH Aachen       *
*                           www.openflipper.org                              *
*                                                                            *
*--------------------------------------------------------------------------- *
*  This file is part of OpenFlipper.                                         *
*                                                                            *
*  OpenFlipper is free software: you can redistribute it and/or modify       *
*  it under the terms of the GNU Lesser General Public License as            *
*  published by the Free Software Foundation, either version 3 of            *
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*  or inline functions from this file, or you compile this file and          *
*  link it with other files to produce an executable, this file does         *
*  not by itself cause the resulting executable to be covered by the         *
*  GNU Lesser General Public License. This exception does not however        *
*  invalidate any other reasons why the executable file might be             *
*  covered by the GNU Lesser General Public License.                         *
*                                                                            *
*  OpenFlipper is distributed in the hope that it will be useful,            *
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*  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the             *
*  GNU Lesser General Public License for more details.                       *
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*  You should have received a copy of the GNU LesserGeneral Public           *
*  License along with OpenFlipper. If not,                                   *
*  see <http://www.gnu.org/licenses/>.                                       *
*                                                                            *
\*===========================================================================*/

/*===========================================================================*\
*                                                                            *
*   $Revision$                                                       *
*   $LastChangedBy$                                                *
*   $Date$                     *
*                                                                            *
\*===========================================================================*/

#include <QtGui>

#include "MeshRepairPlugin.hh"

#include <iostream>

#include <OpenFlipper/BasePlugin/PluginFunctions.hh>
#include "OpenFlipper/INIFile/INIFile.hh"

#include <MeshTools/MeshSelectionT.hh>
#include <ACG/Geometry/Algorithms.hh>
#include <Math_Tools/Math_Tools.hh>

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

void
MeshRepairPlugin::
initializePlugin()
{
  tool_ = new MeshRepairToolbarWidget();
  QSize size(300, 300);
  tool_->resize(size);
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  // Vertex Selection/Removal
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  connect(tool_->valenceThreeButton, SIGNAL(clicked()), this, SLOT(slotDetectFlatValence3Vertices()) );
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  connect(tool_->repairRemoveVButton, SIGNAL(clicked()), this, SLOT(slotRemoveSelectedVal3Vertices()) );

  // Edge Selection/Repairing
  connect(tool_->detectEShorterButton, SIGNAL(clicked()), this, SLOT(slotDetectEdgesShorter()) );
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  connect(tool_->detectELargerButton, SIGNAL(clicked()), this, SLOT(slotDetectEdgesLonger()) );
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  connect(tool_->repairCollapseEButton, SIGNAL(clicked()), this, SLOT(slotRemoveSelectedEdges()) );
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  connect(tool_->detectCapAngle, SIGNAL(clicked()), this, SLOT(slotDetectSkinnyTriangleByAngle()) );
  connect(tool_->repairFlipEButton, SIGNAL(clicked()), this, SLOT(slotRemoveSkinnyTriangleByAngle()) );
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  connect(tool_->detectFoldoverButton, SIGNAL(clicked()), this, SLOT(slotDetectFoldover()) );
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  //Face operations
  connect(tool_->triangleAspectButton,SIGNAL(clicked()),this,SLOT(slotDetectTriangleAspect()));
  connect(tool_->flipOrientation,SIGNAL(clicked()),this,SLOT(slotFlipOrientation()));

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  //Normal operations
  connect(tool_->computeNormals,SIGNAL(clicked()),this,SLOT(slotUpdateNormals()));
  connect(tool_->computeVertexNormals,SIGNAL(clicked()),this,SLOT(slotUpdateVertexNormals()));
  connect(tool_->computeFaceNormals,SIGNAL(clicked()),this,SLOT(slotUpdateFaceNormals()));

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  toolIcon_ = new QIcon(OpenFlipper::Options::iconDirStr()+OpenFlipper::Options::dirSeparator()+"meshrepair-toolbox.png");
  tool_->repairCollapseEButton->setIcon(*toolIcon_);
  tool_->repairFlipEButton->setIcon(*toolIcon_);
  tool_->repairRemoveVButton->setIcon(*toolIcon_);
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  emit addToolbox( tr("Mesh Repair") , tool_,  toolIcon_);
}

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//-----------------------------------------------------------------------------
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void MeshRepairPlugin::slotRemoveSelectedVal3Vertices() {
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  for ( PluginFunctions::ObjectIterator o_it(PluginFunctions::TARGET_OBJECTS,DataType( DATA_TRIANGLE_MESH ) );  o_it != PluginFunctions::objectsEnd(); ++o_it) {

    float angle = tool_->detectFoldoverSpinbox->value();
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    unsigned int count(0);
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    if (o_it->dataType() != DATA_TRIANGLE_MESH) {
      emit log("Cannot delete/merge vertices on non-trimesh " + QString::number(o_it->id()) + ".");
      continue;
    }

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    // get the target mesh
    TriMesh* mesh = 0;
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    PluginFunctions::getMesh(o_it->id(),mesh);
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    if ( mesh ) {
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      TriMesh::VertexIter                 v_it, v_end(mesh->vertices_end());
      TriMesh::VVIter                     vv_it;
      TriMesh::VFIter                     vf_it;
      int                                 i;
      std::vector<TriMesh::VertexHandle>  vh(3);
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      for (v_it=mesh->vertices_begin(); v_it!=v_end; ++v_it)
      {
        vf_it = mesh->vf_iter(v_it);
        if ((mesh->status(v_it).selected()) && !mesh->status(v_it).feature() && mesh->valence(v_it) == 3)
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        {
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          for (i=0, vv_it=mesh->vv_iter(v_it); vv_it; ++vv_it, ++i)
            vh[2-i] = vv_it.handle();
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          mesh->delete_vertex(v_it, false);
          mesh->add_face(vh);
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          ++count;
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        }
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      }
      if (count > 0)
        mesh->garbage_collection();
    }
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    if (count > 0) {
      emit updatedObject(o_it->id(), UPDATE_ALL);
      emit createBackup(o_it->id(), "Delete/merge selected vertices", UPDATE_ALL);
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    }
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    emit log ("Deleted " + QString::number(count) + " vertices on object " + QString::number(o_it->id()) + ".");
  }
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  emit updateView();
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}

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

void MeshRepairPlugin::removeSelectedEdges(int _objectId){
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  // get the target mesh
  TriMesh* triMesh = 0;
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  PluginFunctions::getMesh(_objectId,triMesh);
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  if ( triMesh ) {
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    TriMesh::EdgeIter e_it, e_end=triMesh->edges_end();
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    for (e_it = triMesh->edges_begin(); e_it != e_end ; ++e_it) {
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      if ( !triMesh->status(e_it).deleted() && triMesh->status(e_it).selected() ) {
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        const TriMesh::VHandle   v0 = triMesh->to_vertex_handle(triMesh->halfedge_handle(e_it, 0));
        const TriMesh::VHandle   v1 = triMesh->to_vertex_handle(triMesh->halfedge_handle(e_it, 1));
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        const bool boundary0 = triMesh->is_boundary(v0);
        const bool boundary1 = triMesh->is_boundary(v1);
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        const bool feature0 = triMesh->status(v0).feature();
        const bool feature1 = triMesh->status(v1).feature();
        const bool featureE = triMesh->status(e_it).feature();
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        // Collapsing v1 into vo:
        // collapse is ok, if collapsed vertex is not a feature vertex or the target vertex is a feature
        // and if we collapse along an feature edge or if the collapsed vertex is not a feature
        if ((!boundary1 || boundary0) && (!feature1 || (feature0 && featureE)) && triMesh->is_collapse_ok(triMesh->halfedge_handle(e_it, 0)))
          triMesh->collapse(triMesh->halfedge_handle(e_it, 0));
        else if ((!boundary0 || boundary1) && (!feature0 || (feature1 && featureE)) && triMesh->is_collapse_ok(triMesh->halfedge_handle(e_it, 1)))
          triMesh->collapse(triMesh->halfedge_handle(e_it, 1));
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      }
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    }
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    triMesh->garbage_collection();
    triMesh->update_normals();
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    emit updatedObject(_objectId,UPDATE_ALL);
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    emit createBackup( _objectId, "Removed selected Edges", UPDATE_ALL);
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    emit scriptInfo( "removeSelectedEdges(" + QString::number(_objectId) + ")" );
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    return;
  }
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  emit log( LOGERR,tr("Unsupported Object Type for edge removal") );
    
}

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

void MeshRepairPlugin::slotRemoveSelectedEdges(){
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  for ( PluginFunctions::ObjectIterator o_it(PluginFunctions::TARGET_OBJECTS,DataType( DATA_TRIANGLE_MESH ) );  o_it != PluginFunctions::objectsEnd(); ++o_it) 
    removeSelectedEdges(o_it->id());
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  emit updateView();
}


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

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void MeshRepairPlugin::detectSkinnyTriangleByAngle(int _objectId, double _angle, bool _remove)
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{
  // get the target mesh
  TriMesh* triMesh = 0;
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  PluginFunctions::getMesh(_objectId,triMesh);
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  if ( triMesh ) {

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    // Clear current edge selection
    MeshSelection::clearEdgeSelection(triMesh);
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    double maxAngle = cos(_angle * M_PI / 180.0);
    double angle = 0.0;
    TriMesh::EdgeIter e_it, e_end=triMesh->edges_end();
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    for (e_it = triMesh->edges_begin(); e_it != e_end ; ++e_it) {
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      // Check prerequisites
      if (!triMesh->status(e_it).deleted() && !triMesh->status(e_it).feature() && triMesh->is_flip_ok(e_it)) {
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        // For both halfedges
        for (unsigned int h=0; h<2; ++h) {
          TriMesh::HalfedgeHandle hh = triMesh->halfedge_handle(e_it.handle(), h);
          const TriMesh::Point& a = triMesh->point(triMesh->from_vertex_handle(hh));
          const TriMesh::Point& b = triMesh->point(triMesh->to_vertex_handle(hh));
          hh = triMesh->next_halfedge_handle(hh);
          const TriMesh::Point& c  = triMesh->point(triMesh->to_vertex_handle(hh));
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          angle  = ( (a-c).normalize() | (b-c).normalize() );
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          if (angle < maxAngle) {
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            // selcet it
            triMesh->status(e_it).set_selected(true);
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            // remove it if requested
            if (_remove) 
              triMesh->flip(e_it);
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          }
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        }
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      }
    }
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    if ( _remove ) {
      emit updatedObject(_objectId, UPDATE_ALL);
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      emit createBackup( _objectId, tr("Removed cap edges"), UPDATE_ALL );
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    } else {
      emit updatedObject(_objectId, UPDATE_SELECTION);
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      emit createBackup( _objectId, tr("Selected cap edges"), UPDATE_ALL );
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    }
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    emit scriptInfo( "detectSkinnyTriangleByAngle(" + QString::number(_objectId) + "," + QString::number(_angle) + "," + _remove + ")" );
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    return;
  }
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  emit log( LOGERR,tr("Unsupported Object Type for Cap detection!") );
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}

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

void MeshRepairPlugin::slotDetectSkinnyTriangleByAngle()
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{
  for ( PluginFunctions::ObjectIterator o_it(PluginFunctions::TARGET_OBJECTS,DataType( DATA_TRIANGLE_MESH | DATA_POLY_MESH ) );  o_it != PluginFunctions::objectsEnd(); ++o_it) 
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    detectSkinnyTriangleByAngle( o_it->id(), tool_->capAngleSpinbox->value(), false );
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  emit updateView();
}

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

void MeshRepairPlugin::slotRemoveSkinnyTriangleByAngle()
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{
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  //rewrite!!!
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  for ( PluginFunctions::ObjectIterator o_it(PluginFunctions::TARGET_OBJECTS,DataType( DATA_TRIANGLE_MESH | DATA_POLY_MESH ) );  o_it != PluginFunctions::objectsEnd(); ++o_it) 
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    detectSkinnyTriangleByAngle( o_it->id(), tool_->capAngleSpinbox->value(), true );
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  emit updateView();
}

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

void MeshRepairPlugin::slotDetectFoldover() {

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  for ( PluginFunctions::ObjectIterator o_it(PluginFunctions::TARGET_OBJECTS,DataType( DATA_TRIANGLE_MESH | DATA_POLY_MESH ) );  o_it != PluginFunctions::objectsEnd(); ++o_it) {
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    float angle = tool_->detectFoldoverSpinbox->value();
    unsigned int count(0);
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    //is there any way to get around duplicating this code?
    if (o_it->dataType() == DATA_TRIANGLE_MESH) {
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      // get the target mesh
      TriMesh* mesh = 0;
      PluginFunctions::getMesh(o_it->id(),mesh);
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      if ( mesh ) {
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        // Clear current edge selection
        MeshSelection::clearEdgeSelection(mesh);
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        TriMesh::EdgeIter      e_it, e_end(mesh->edges_end());
        TriMesh::FaceHandle    fh;
        TriMesh::Scalar        a, cosa = cos(angle/180.0*M_PI);
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        for (e_it=mesh->edges_begin(); e_it!=e_end; ++e_it)
        {
          if (!mesh->is_boundary(e_it))
          {
            a = ( mesh->normal(mesh->face_handle(mesh->halfedge_handle(e_it, 0))) |
                mesh->normal(mesh->face_handle(mesh->halfedge_handle(e_it, 1))) );
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            if (a < cosa)
            {
              mesh->status(mesh->edge_handle(mesh->halfedge_handle(e_it, 0))).
                  set_selected(true);
              ++count;
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            }
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          }
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        }
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      }
    }
    else if (o_it->dataType() == DATA_POLY_MESH) {

      // get the target mesh
      PolyMesh* mesh = 0;
      PluginFunctions::getMesh(o_it->id(),mesh);

      if ( mesh ) {

        // Clear current edge selection
        MeshSelection::clearEdgeSelection(mesh);

        PolyMesh::EdgeIter      e_it, e_end(mesh->edges_end());
        PolyMesh::FaceHandle    fh;
        PolyMesh::Scalar        a, cosa = cos(angle/180.0*M_PI);

        for (e_it=mesh->edges_begin(); e_it!=e_end; ++e_it)
        {
          if (!mesh->is_boundary(e_it))
          {
            a = ( mesh->normal(mesh->face_handle(mesh->halfedge_handle(e_it, 0))) |
                mesh->normal(mesh->face_handle(mesh->halfedge_handle(e_it, 1))) );

            if (a < cosa)
            {
              mesh->status(mesh->edge_handle(mesh->halfedge_handle(e_it, 0))).
                  set_selected(true);
              ++count;
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            }
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          }
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        }
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      }
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    }

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    if (count > 0) {
      emit updatedObject(o_it->id(), UPDATE_SELECTION);
      emit createBackup(o_it->id(), "Select edges", UPDATE_SELECTION);
    }
    emit log ("Selected " + QString::number(count) + " fold-overs on object " + QString::number(o_it->id()) + " with angle greater than " + QString::number(angle) + ".");
  }

  emit updateView();
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}

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

void MeshRepairPlugin::slotDetectTriangleAspect() {

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  for ( PluginFunctions::ObjectIterator o_it(PluginFunctions::TARGET_OBJECTS,DataType( DATA_TRIANGLE_MESH | DATA_POLY_MESH ) );  o_it != PluginFunctions::objectsEnd(); ++o_it) {
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    if (o_it->dataType() != DATA_TRIANGLE_MESH) {
      emit log("Cannot detect skinny triangles on non-trimesh " + QString::number(o_it->id()) + ".");
      continue;
    }
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    float aspect = tool_->triangleAspectSpinbox->value();
    unsigned int count(0);
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    // get the target mesh
    TriMesh* mesh = 0;
    PluginFunctions::getMesh(o_it->id(),mesh);
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    if ( mesh ) {
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      // Clear current face selection
      MeshSelection::clearFaceSelection(mesh);
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      TriMesh::FaceIter      f_it, f_end(mesh->faces_end());
      TriMesh::FVIter        fv_it;
      TriMesh::FEIter        fe_it;
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      for (f_it=mesh->faces_begin(); f_it!=f_end; ++f_it)
      {
        fv_it = mesh->fv_iter(f_it);
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        const TriMesh::Point& p0 = mesh->point(fv_it);
        const TriMesh::Point& p1 = mesh->point(++fv_it);
        const TriMesh::Point& p2 = mesh->point(++fv_it);

        if (ACG::Geometry::aspectRatio(p0, p1, p2) > aspect)
        {
          mesh->status(f_it).set_selected(true);
          ++count;
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        }
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      }
    }
    if (count > 0) {
      emit updatedObject(o_it->id(), UPDATE_SELECTION);
      emit createBackup(o_it->id(), "Select triangles", UPDATE_SELECTION);
    }
    emit log ("Selected " + QString::number(count) + " triangles on object " + QString::number(o_it->id()) + " with aspect ratio greater than " + QString::number(aspect) + ".");
  }

  emit updateView();
}


















//===========================================================================
// Button Slots
//===========================================================================

void MeshRepairPlugin::slotFlipOrientation(){

  for ( PluginFunctions::ObjectIterator o_it(PluginFunctions::TARGET_OBJECTS,DataType( DATA_TRIANGLE_MESH | DATA_POLY_MESH ) );  o_it != PluginFunctions::objectsEnd(); ++o_it)
    flipOrientation(o_it->id());

  emit updateView();
}

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

void MeshRepairPlugin::slotUpdateVertexNormals() {
  for ( PluginFunctions::ObjectIterator o_it(PluginFunctions::TARGET_OBJECTS,DataType( DATA_TRIANGLE_MESH | DATA_POLY_MESH ) );  o_it != PluginFunctions::objectsEnd(); ++o_it)
    updateVertexNormals(o_it->id());

  emit updateView();
}

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

void MeshRepairPlugin::slotUpdateFaceNormals() {
  for ( PluginFunctions::ObjectIterator o_it(PluginFunctions::TARGET_OBJECTS,DataType( DATA_TRIANGLE_MESH | DATA_POLY_MESH ) );  o_it != PluginFunctions::objectsEnd(); ++o_it)
    updateFaceNormals(o_it->id());

  emit updateView();
}

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

void MeshRepairPlugin::slotUpdateNormals(){
  for ( PluginFunctions::ObjectIterator o_it(PluginFunctions::TARGET_OBJECTS,DataType( DATA_TRIANGLE_MESH | DATA_POLY_MESH ) );  o_it != PluginFunctions::objectsEnd(); ++o_it)
    updateNormals(o_it->id());

  emit updateView();
}

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

void MeshRepairPlugin::slotDetectEdgesShorter(){
  double length = tool_->edgeSpin->value();

  for ( PluginFunctions::ObjectIterator o_it(PluginFunctions::TARGET_OBJECTS,DataType( DATA_TRIANGLE_MESH | DATA_POLY_MESH ) );  o_it != PluginFunctions::objectsEnd(); ++o_it)
    selectEdgesShorterThan(o_it->id(),length);

  emit updateView();
}

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

void MeshRepairPlugin::slotDetectEdgesLonger(){
  double length = tool_->edgeSpin->value();

  for ( PluginFunctions::ObjectIterator o_it(PluginFunctions::TARGET_OBJECTS,DataType( DATA_TRIANGLE_MESH | DATA_POLY_MESH ) );  o_it != PluginFunctions::objectsEnd(); ++o_it)
    selectEdgesLongerThan(o_it->id(),length);

  emit updateView();
}

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

void MeshRepairPlugin::slotDetectFlatValence3Vertices() {
  double angle = tool_->valenceThreeSpinbox->value();

  for ( PluginFunctions::ObjectIterator o_it(PluginFunctions::TARGET_OBJECTS,DataType( DATA_TRIANGLE_MESH | DATA_POLY_MESH ) );  o_it != PluginFunctions::objectsEnd(); ++o_it)
    detectFlatValence3Vertices(o_it->id(), angle);

  emit updateView();
}

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

/** \brief Initialization of the plugin when it is loaded by the core
 *
 */
void MeshRepairPlugin::pluginsInitialized() {

  emit setSlotDescription("updateFaceNormals(int)",tr("Recompute Face normals"),
                          QStringList(tr("objectId")),
                          QStringList(tr("ID of an object")));

  emit setSlotDescription("updateVertexNormals(int)",tr("Recompute Vertex normals"),
                          QStringList(tr("objectId")),
                          QStringList(tr("ID of an object")));

  emit setSlotDescription("updateNormals(int)",tr("Recompute Face and Vertex normals"),
                          QStringList(tr("objectId")),
                          QStringList(tr("ID of an object")));

  emit setSlotDescription("flipOrientation(int)",tr("Flips the normals of all faces by changing the vertex order in each face"),
                          QStringList(tr("objectId")),
                          QStringList(tr("ID of an object")));


  emit setSlotDescription("selectEdgesShorterThan(int,double)",tr("Selects all edges of an object which are shorter than the given length"),
                              QString(tr("objectId,length")).split(","),
                              QString(tr("ID of an object; All edges shorter than this length will be selected")).split(";"));

  emit setSlotDescription("selectEdgesLongerThan(int,double)",tr("Selects all edges of an object which are longer than the given length"),
                              QString(tr("objectId,length")).split(","),
                              QString(tr("ID of an object; All edges longer than this length will be selected")).split(";"));

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  emit setSlotDescription("detectFlatValence3Vertices(int,double)",tr("Selects all vertices that have valence 3 and the normals of their neighboring faces have an angle less then the given angle"),
                              QString(tr("objectId,angle")).split(","),
                              QString(tr("ID of an object; the maximal angle between the adjacent faces")).split(";"));

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}



//===========================================================================
// Scriptable functions
//===========================================================================

void MeshRepairPlugin::updateFaceNormals(int _objectId) {
  BaseObjectData* object = 0;
  PluginFunctions::getObject(_objectId,object);

  if ( object == 0) {
    emit log(LOGERR,tr("updateFaceNormals: Unable to get object %1. ").arg(_objectId) );
  }

  if ( object->dataType(DATA_TRIANGLE_MESH) ) {
    TriMesh* mesh = PluginFunctions::triMesh(object);
    mesh->update_face_normals();
    emit updatedObject(_objectId, UPDATE_ALL);
    emit createBackup( _objectId, "Updated Face Normals", UPDATE_ALL);
    emit scriptInfo( "updateFaceNormals(" + QString::number(_objectId) + ")" );
  } else if ( object->dataType(DATA_POLY_MESH) ) {
    PolyMesh* mesh = PluginFunctions::polyMesh(object);
    mesh->update_face_normals();
    emit updatedObject(_objectId, UPDATE_ALL);
    emit createBackup( _objectId, "Updated Face Normals", UPDATE_ALL);
    emit scriptInfo( "updateFaceNormals(" + QString::number(_objectId) + ")" );
  } else
    emit log(LOGERR,tr("updateFaceNormals: MeshRepair only works on triangle and poly meshes!") );

}

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


void MeshRepairPlugin::updateVertexNormals(int _objectId){
  BaseObjectData* object = 0;
  PluginFunctions::getObject(_objectId,object);

  if ( object == 0) {
    emit log(LOGERR,tr("updateVertexNormals: Unable to get object %1. ").arg(_objectId) );
  }

  if ( object->dataType(DATA_TRIANGLE_MESH) ) {
    TriMesh* mesh = PluginFunctions::triMesh(object);
    mesh->update_vertex_normals();
    emit updatedObject(_objectId, UPDATE_ALL);
    emit createBackup( _objectId, "Updated Vertex Normals", UPDATE_ALL);
    emit scriptInfo( "updateVertexNormals(" + QString::number(_objectId) + ")" );
  } else if ( object->dataType(DATA_POLY_MESH) ) {
    PolyMesh* mesh = PluginFunctions::polyMesh(object);
    mesh->update_vertex_normals();
    emit updatedObject(_objectId, UPDATE_ALL);
    emit createBackup( _objectId, "Updated Vertex Normals", UPDATE_ALL);
    emit scriptInfo( "updateVertexNormals(" + QString::number(_objectId) + ")" );
  } else
    emit log(LOGERR,tr("updateVertexNormals: MeshRepair only works on triangle and poly meshes!") );
}

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

void MeshRepairPlugin::updateNormals(int _objectId) {
  BaseObjectData* object = 0;
  PluginFunctions::getObject(_objectId,object);

  if ( object == 0) {
    emit log(LOGERR,tr("updateNormals: Unable to get object %1. ").arg(_objectId) );
  }

  if ( object->dataType(DATA_TRIANGLE_MESH) ) {
    TriMesh* mesh = PluginFunctions::triMesh(object);
    mesh->update_normals();
    emit scriptInfo( "updateNormals(" + QString::number(_objectId) + ")" );
  } else if ( object->dataType(DATA_POLY_MESH) ) {
    PolyMesh* mesh = PluginFunctions::polyMesh(object);
    mesh->update_normals();
    emit updatedObject(_objectId, UPDATE_ALL);
    emit createBackup( _objectId, "Updated All Normals", UPDATE_ALL);
    emit scriptInfo( "updateNormals(" + QString::number(_objectId) + ")" );
  } else
    emit log(LOGERR,tr("updateNormals: MeshRepair only works on triangle and poly meshes!") );
}

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

void
MeshRepairPlugin::
flipOrientation(int _objectId)
{
  // get the target mesh
  TriMesh* triMesh = 0;

  PluginFunctions::getMesh(_objectId,triMesh);

  if ( triMesh ) {

    TriMesh::FaceIter f_it, f_end=triMesh->faces_end();

    std::vector< TriMesh::VertexHandle > handles;
    handles.reserve( triMesh->n_faces() * 3 );

    for (f_it = triMesh->faces_begin(); f_it != f_end ; ++f_it) {

      if (triMesh->status(f_it).selected()) {
        // Collect vertex handles
        TriMesh::FaceVertexIter fv_it = triMesh->fv_iter(f_it);
        handles.push_back( fv_it.handle() );
        ++fv_it;
        handles.push_back( fv_it.handle() );
        ++fv_it;
        handles.push_back( fv_it.handle() );

        // delete the corresponding face
        triMesh->delete_face(f_it, false);
      }
    }

    // clean the mesh
    triMesh->garbage_collection();

    // read the faces
    for (uint i=0; i < handles.size(); i += 3)
      triMesh->add_face(handles[ i + 2 ],handles[ i + 1 ],handles[ i + 0 ]);

    triMesh->update_normals();

    emit updatedObject(_objectId, UPDATE_ALL);
    emit createBackup( _objectId, "Flipped Normals", UPDATE_ALL);
    emit scriptInfo( "flipOrientation(" + QString::number(_objectId) + ")" );

    return;
  }

  // get the target mesh
  PolyMesh* polyMesh = 0;

  PluginFunctions::getMesh(_objectId,polyMesh);

  if ( polyMesh ) {

    PolyMesh::FaceIter f_it, f_end=polyMesh->faces_end();

    std::vector< PolyMesh::VertexHandle > handles;
    std::vector< uint > valence;
    // Reserve for a quad mesh, might be to small!
    handles.reserve( polyMesh->n_faces() * 4 );
    valence.reserve( polyMesh->n_faces() );


    for (f_it = polyMesh->faces_begin(); f_it != f_end ; ++f_it) {

      // Collect vertex handles
      PolyMesh::FaceVertexIter fv_it = polyMesh->fv_iter(f_it);

      valence.push_back( polyMesh->valence(f_it) );
      while( fv_it) {
        handles.push_back( fv_it.handle() );
        ++fv_it;
      }

      // delete the corresponding face
      polyMesh->delete_face(f_it, false);
    }

    // clean the mesh
    polyMesh->garbage_collection();

    // read the faces
    uint pos = 0;
    for (uint i=0; i < valence.size(); i++) {

      std::vector< PolyMesh::VertexHandle > faceVertices;

      pos += valence[i];

      // add valence vertices in the inverse order
      for (uint j = 1 ; j <= valence[i] ; ++j )
        faceVertices.push_back(handles[pos - j]);

      polyMesh->add_face(faceVertices);
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    }

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    polyMesh->update_normals();

    emit updatedObject(_objectId, UPDATE_ALL);
    emit createBackup( _objectId, "Flipped Normals", UPDATE_ALL);
    emit scriptInfo( "flipOrientation(" + QString::number(_objectId) + ")" );

    return;
  }


  emit log( LOGERR,tr("Unsupported Object Type for normal flipping!") );
}

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

void MeshRepairPlugin::selectEdgesShorterThan(int _objectId,double _length) {
  selectionEdgeLength(_objectId,_length,false);

  emit scriptInfo( "selectEdgesShorterThan(" + QString::number(_objectId) + ", " + QString::number(_length) + ")" );
}

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

void MeshRepairPlugin::selectEdgesLongerThan(int _objectId,double _length) {
  selectionEdgeLength(_objectId,_length,true);

  emit scriptInfo( "selectEdgesLongerThan(" + QString::number(_objectId) + ", " + QString::number(_length) + ")" );
}

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

void MeshRepairPlugin::selectionEdgeLength(int _objectId, double _length, bool _larger) {

  // get the target mesh
  TriMesh* triMesh = 0;

  PluginFunctions::getMesh(_objectId,triMesh);

  if ( triMesh ) {
    TriMesh::EdgeIter e_it, e_end=triMesh->edges_end();

    // Clear current edge selection
    MeshSelection::clearEdgeSelection(triMesh);

    // Iterate over all edges
    for (e_it = triMesh->edges_begin(); e_it != e_end ; ++e_it) {
      TriMesh::HalfedgeHandle he = triMesh->halfedge_handle( e_it, 0 );
      TriMesh::Point p1 = triMesh->point( triMesh->from_vertex_handle( he ) );
      TriMesh::Point p2 = triMesh->point( triMesh->to_vertex_handle( he )   );

      if ( _larger ) {
        if ( (p1 - p2).norm() > _length)
          triMesh->status(e_it).set_selected(true);
      } else {
        if ( (p1 - p2).norm() < _length)
          triMesh->status(e_it).set_selected(true);
      }
    }

    emit updatedObject(_objectId,UPDATE_SELECTION);
    emit createBackup( _objectId, "Select Edges", UPDATE_SELECTION);

    return;
  }

  // get the target mesh
  PolyMesh* polyMesh = 0;
  PluginFunctions::getMesh(_objectId,polyMesh);

  if ( polyMesh ) {
    PolyMesh::EdgeIter e_it, e_end=polyMesh->edges_end();

    // Clear current edge selection
    MeshSelection::clearEdgeSelection(polyMesh);

    // Iterate over all edges
    for (e_it = polyMesh->edges_begin(); e_it != e_end ; ++e_it) {
      PolyMesh::HalfedgeHandle he = polyMesh->halfedge_handle( e_it, 0 );
      PolyMesh::Point p1 = polyMesh->point( polyMesh->from_vertex_handle( he ) );
      PolyMesh::Point p2 = polyMesh->point( polyMesh->to_vertex_handle( he )   );

      if ( _larger ) {
        if ( (p1 - p2).norm() > _length)
          polyMesh->status(e_it).set_selected(true);
      } else {
        if ( (p1 - p2).norm() < _length)
          polyMesh->status(e_it).set_selected(true);
      }
    }

    emit updatedObject(_objectId,UPDATE_SELECTION);
    emit createBackup( _objectId, "Select Edges", UPDATE_SELECTION);

    return;
  }

  emit log( LOGERR,tr("Unsupported Object Type for edge selection") );

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}

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

void MeshRepairPlugin::detectFlatValence3Vertices(int _objectId, double _angle) {

  unsigned int count(0);

  // get the target mesh
  TriMesh* mesh = 0;
  PluginFunctions::getMesh(_objectId,mesh);

  if ( mesh ) {

    // Clear current triangle selection
    MeshSelection::clearVertexSelection(mesh);

    TriMesh::VertexIter                 v_it, v_end(mesh->vertices_end());
    TriMesh::VVIter                     vv_it;
    TriMesh::VFIter                     vf_it;
    TriMesh::FaceHandle                 fh;
    std::vector<TriMesh::VertexHandle>  vh(3);
    TriMesh::Scalar                     cosangle(cos(_angle/180.0*M_PI));

    for (v_it=mesh->vertices_begin(); v_it!=v_end; ++v_it)
    {
      if (!mesh->status(v_it).deleted() && !mesh->is_boundary(v_it) && mesh->valence(v_it) == 3)
      {
        vf_it = mesh->vf_iter(v_it);
        const TriMesh::Normal& n0 = mesh->normal(vf_it);
        const TriMesh::Normal& n1 = mesh->normal(++vf_it);
        const TriMesh::Normal& n2 = mesh->normal(++vf_it);

        if ( (n0|n1) > cosangle &&
             (n0|n2) > cosangle &&
             (n1|n2) > cosangle )
        {

          mesh->status(v_it).set_selected(true);
          ++count;
        }
      }
    }
  }
  else {
    emit log(LOGERR, "Cannot detect flat triangles on non-trimesh " + QString::number(_objectId) + ".");
  }

  if (count > 0) {
    emit updatedObject(_objectId, UPDATE_SELECTION);
    emit createBackup(_objectId, "Select vertices", UPDATE_SELECTION);
  }

  emit log (LOGINFO,"Selected " + QString::number(count) + " vertices on object " + QString::number(_objectId) + " with face angle difference smaller than " + QString::number(_angle) + ".");
  emit scriptInfo( "detectFlatValence3Vertices(" + QString::number(_objectId) + ", " + QString::number(_angle) + ")" );

}

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

Q_EXPORT_PLUGIN2( meshrepairplugin , MeshRepairPlugin );