// 3 - 2 3 - 2
// | / | or | \ |
// 0 - 1 0 - 1
FaceIndexPair
addFace (const VertexIndex& idx_v_0,
const VertexIndex& idx_v_1,
const VertexIndex& idx_v_2,
const VertexIndex& idx_v_3,
const FaceData& face_data = FaceData ())
{
// Try to add two faces
// 3 - 2
// | / |
// 0 - 1
FaceIndex idx_face_0 = this->addFace (idx_v_0, idx_v_1, idx_v_2, face_data);
FaceIndex idx_face_1 = this->addFace (idx_v_0, idx_v_2, idx_v_3, face_data);
if (idx_face_0.isValid ())
{
return (std::make_pair (idx_face_0, idx_face_1));
}
else if (idx_face_1.isValid ())
{
idx_face_0 = this->addFace (idx_v_0, idx_v_1, idx_v_2, face_data); // might be possible to add now
return (std::make_pair (idx_face_1, idx_face_0));
}
// Try to add two faces
// 3 - 2
// | \ |
// 0 - 1
idx_face_0 = this->addFace (idx_v_1, idx_v_2, idx_v_3, face_data);
idx_face_1 = this->addFace (idx_v_0, idx_v_1, idx_v_3, face_data);
if (idx_face_0.isValid ())
{
return (std::make_pair (idx_face_0, idx_face_1));
}
else if (idx_face_1.isValid ())
{
idx_face_0 = this->addFace (idx_v_1, idx_v_2, idx_v_3, face_data); // might be possible to add now
return (std::make_pair (idx_face_1, idx_face_0));
}
// Connect the triangle pair if possible
if (!idx_v_0.isValid () || !idx_v_1.isValid () || !idx_v_2.isValid () || !idx_v_3.isValid ())
{
return (std::make_pair (FaceIndex (), FaceIndex ()));
}
VertexIndexes vi; vi.reserve (4);
vi.push_back (idx_v_0);
vi.push_back (idx_v_1);
vi.push_back (idx_v_2);
vi.push_back (idx_v_3);
if (!this->uniqueCheck (vi))
{
return (std::make_pair (FaceIndex (), FaceIndex ()));
}
HalfEdgeIndex idx_he_01, idx_he_12, idx_he_23, idx_he_30;
// Check manifoldness
bool is_new_01 = true;
bool is_new_12 = true;
bool is_new_23 = true;
bool is_new_30 = true;
if (!Base::checkTopology1 (idx_v_0,idx_v_1, idx_he_01, is_new_01) ||
!Base::checkTopology1 (idx_v_1,idx_v_2, idx_he_12, is_new_12) ||
!Base::checkTopology1 (idx_v_2,idx_v_3, idx_he_23, is_new_23) ||
!Base::checkTopology1 (idx_v_3,idx_v_0, idx_he_30, is_new_30))
{
return (std::make_pair (FaceIndex (), FaceIndex ()));
}
// Connect the triangle pair
if (!is_new_01 && is_new_12 && !is_new_23 && is_new_30)
{
return (this->connectTrianglePair (idx_he_01, idx_he_23, idx_v_0, idx_v_1, idx_v_2, idx_v_3, face_data));
}
else if (is_new_01 && !is_new_12 && is_new_23 && !is_new_30)
{
return (this->connectTrianglePair (idx_he_12, idx_he_30, idx_v_1, idx_v_2, idx_v_3, idx_v_0, face_data));
}
else
{
assert (true); // This should not happen!
return (std::make_pair (FaceIndex (), FaceIndex ()));
}
}
FaceIndex
addFace (const VertexIndex& idx_v_0,
const VertexIndex& idx_v_1,
const VertexIndex& idx_v_2,
const FaceData& face_data = FaceData ())
{
if (!idx_v_0.isValid () || !idx_v_1.isValid () || !idx_v_2.isValid ())
{
return (FaceIndex ());
}
VertexIndexes vi; vi.reserve (3);
vi.push_back (idx_v_0);
vi.push_back (idx_v_1);
vi.push_back (idx_v_2);
if (!this->uniqueCheck (vi))
{
return (FaceIndex ());
}
HalfEdgeIndex idx_he_01, idx_he_12, idx_he_20;
HalfEdgeIndex idx_he_10, idx_he_21, idx_he_02;
if (Base::getElement (idx_v_0).isIsolated () && Base::getElement (idx_v_1).isIsolated () && Base::getElement (idx_v_2).isIsolated ())
{
Base::addHalfEdgePair (idx_v_0,idx_v_1, HalfEdgeData (),HalfEdgeData (), idx_he_01,idx_he_10);
Base::addHalfEdgePair (idx_v_1,idx_v_2, HalfEdgeData (),HalfEdgeData (), idx_he_12,idx_he_21);
Base::addHalfEdgePair (idx_v_2,idx_v_0, HalfEdgeData (),HalfEdgeData (), idx_he_20,idx_he_02);
Base::connectHalfEdges (true,true, idx_he_01,idx_he_10, idx_he_12,idx_he_21, idx_v_1);
Base::connectHalfEdges (true,true, idx_he_12,idx_he_21, idx_he_20,idx_he_02, idx_v_2);
Base::connectHalfEdges (true,true, idx_he_20,idx_he_02, idx_he_01,idx_he_10, idx_v_0);
return (this->connectFace (face_data, idx_he_01,idx_he_12,idx_he_20));
}
// Check for topological errors
bool is_new_01 = true;
bool is_new_12 = true;
bool is_new_20 = true;
if (!Base::checkTopology1 (idx_v_0,idx_v_1, idx_he_01, is_new_01) ||
!Base::checkTopology1 (idx_v_1,idx_v_2, idx_he_12, is_new_12) ||
!Base::checkTopology1 (idx_v_2,idx_v_0, idx_he_20, is_new_20))
{
return (FaceIndex ());
}
if (!Base::checkTopology2 (is_new_01,is_new_12, Base::getElement (idx_v_1).isIsolated ()) ||
!Base::checkTopology2 (is_new_12,is_new_20, Base::getElement (idx_v_2).isIsolated ()) ||
!Base::checkTopology2 (is_new_20,is_new_01, Base::getElement (idx_v_0).isIsolated ()))
{
return (FaceIndex ());
}
// Reconnect the existing half-edges if needed
bool make_adjacent_01_12 = false;
bool make_adjacent_12_20 = false;
bool make_adjacent_20_01 = false;
HalfEdgeIndex idx_he_boundary_01_12;
HalfEdgeIndex idx_he_boundary_12_20;
HalfEdgeIndex idx_he_boundary_20_01;
if (!Base::checkAdjacency (idx_he_01,idx_he_12, is_new_01,is_new_12, make_adjacent_01_12, idx_he_boundary_01_12) ||
!Base::checkAdjacency (idx_he_12,idx_he_20, is_new_12,is_new_20, make_adjacent_12_20, idx_he_boundary_12_20) ||
!Base::checkAdjacency (idx_he_20,idx_he_01, is_new_20,is_new_01, make_adjacent_20_01, idx_he_boundary_20_01))
{
return (FaceIndex ());
}
Base::makeAdjacent (idx_he_01,idx_he_12, make_adjacent_01_12, idx_he_boundary_01_12);
Base::makeAdjacent (idx_he_12,idx_he_20, make_adjacent_12_20, idx_he_boundary_12_20);
Base::makeAdjacent (idx_he_20,idx_he_01, make_adjacent_20_01, idx_he_boundary_20_01);
// Add the new half-edges if needed
if (is_new_01) Base::addHalfEdgePair (idx_v_0,idx_v_1, HalfEdgeData (),HalfEdgeData (), idx_he_01,idx_he_10);
else idx_he_10 = Base::getElement (idx_he_01).getOppositeHalfEdgeIndex ();
if (is_new_12) Base::addHalfEdgePair (idx_v_1,idx_v_2, HalfEdgeData (),HalfEdgeData (), idx_he_12,idx_he_21);
else idx_he_21 = Base::getElement (idx_he_12).getOppositeHalfEdgeIndex ();
if (is_new_20) Base::addHalfEdgePair (idx_v_2,idx_v_0, HalfEdgeData (),HalfEdgeData (), idx_he_20,idx_he_02);
else idx_he_02 = Base::getElement (idx_he_20).getOppositeHalfEdgeIndex ();
// Connect the half-edges and vertexes
Base::connectHalfEdges (is_new_01,is_new_12, idx_he_01,idx_he_10, idx_he_12,idx_he_21, idx_v_1);
Base::connectHalfEdges (is_new_12,is_new_20, idx_he_12,idx_he_21, idx_he_20,idx_he_02, idx_v_2);
Base::connectHalfEdges (is_new_20,is_new_01, idx_he_20,idx_he_02, idx_he_01,idx_he_10, idx_v_0);
// Connect the face
return (this->connectFace (face_data, idx_he_01,idx_he_12,idx_he_20));
}
