TriangleMesh.cc

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//== INCLUDES =================================================================
 
#include <ObjectTypes/TriangleMesh/TriangleMesh.hh>
 
#include <ACG/Scenegraph/StatusNodesT.hh>
#include <ACG/QtScenegraph/QtTranslationManipulatorNode.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;
}
 
 
//=============================================================================