TriangleMesh.cc

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/*===========================================================================*\
*                                                                            *
*   $Revision: 18128 $                                                       *
*   $LastChangedBy: moebius $                                                *
*   $Date: 2014-02-05 10:20:28 +0100 (Mi, 05. Feb 2014) $                     *
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\*===========================================================================*/


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

#include <ObjectTypes/TriangleMesh/TriangleMesh.hh>


TriMeshObject::TriMeshObject(const TriMeshObject& _object) : MeshObject< TriMesh >(_object) {

}


TriMeshObject::TriMeshObject(DataType _typeId) : MeshObject< TriMesh >(_typeId) {

}


TriMeshObject::~TriMeshObject() {

}

BaseObject* TriMeshObject::copy() {
  TriMeshObject* object = new TriMeshObject(*this );
  return object;
}

ACG::Vec3d TriMeshObject::refinePick(ACG::SceneGraph::PickTarget _pickTarget, const ACG::Vec3d _hitPoint, const ACG::Vec3d _start , const ACG::Vec3d _dir,  const unsigned int _targetIdx  ) {
  if ( _pickTarget == ACG::SceneGraph::PICK_FACE) {

    // get picked face handle
    TriMesh::FaceHandle fh = mesh()->face_handle(_targetIdx);

    TriMesh::FaceVertexIter fv_it = mesh()->fv_begin(fh);

    // Get vertices of the face
    ACG::Vec3d p1 = mesh()->point(*fv_it);
    ++fv_it;

    ACG::Vec3d p2 = mesh()->point(*fv_it);
    ++fv_it;

    ACG::Vec3d p3 = mesh()->point(*fv_it);
    ++fv_it;

    ACG::Vec3d hitpointNew = _hitPoint;

    TriMesh::Scalar t,u,v;
    if ( ACG::Geometry::triangleIntersection( _start, _dir, p1 , p2 , p3 , t , u , v) ) {
      hitpointNew = _start + t * _dir;
    }

    return hitpointNew;
  }

  if ( _pickTarget == ACG::SceneGraph::PICK_EDGE) {
    // get picked edge handle
    TriMesh::EdgeHandle eh = mesh()->edge_handle(_targetIdx);
    if(eh.is_valid())
    {
      TriMesh::HalfedgeHandle heh = mesh()->halfedge_handle(eh,0);

      //get vertices of the edge
      TriMesh::VertexHandle vhbegin = mesh()->to_vertex_handle(heh);
      TriMesh::VertexHandle vhend = mesh()->from_vertex_handle(heh);
      ACG::Vec3d edgeStart = mesh()->point(vhbegin);
      ACG::Vec3d edgeEnd = mesh()->point(vhend);

      //retrieve the point on the edge that is closest to the backprojected hitpoint
      ACG::Vec3d hitPointNew;
      ACG::Geometry::distPointLineSquared(_hitPoint,edgeStart,edgeEnd,&hitPointNew);


      return hitPointNew;
    }
  }

  if ( _pickTarget == ACG::SceneGraph::PICK_VERTEX) {
    // get picked vertex handle
    TriMesh::VertexHandle vh = mesh()->vertex_handle(_targetIdx);
    if(vh.is_valid())
    {
      ACG::Vec3d hitpointNew = mesh()->point(vh);

      //just return the vertex position
      return hitpointNew;
    }
  }

  return _hitPoint;
}


//=============================================================================