_SetToNeighbourCorner
_SetToNeighbourCorner(fLeftTopCrossing->LeftBottomCorner());
_SetToNeighbourCorner(fLeftTopCrossing->RightTopCorner());
_SetToNeighbourCorner(fRightTopCrossing->LeftTopCorner());
_SetToNeighbourCorner(fRightTopCrossing->RightBottomCorner());
_SetToNeighbourCorner(fLeftBottomCrossing->LeftTopCorner());
_SetToNeighbourCorner(fLeftBottomCrossing->RightBottomCorner());
_SetToNeighbourCorner(fRightBottomCrossing->LeftBottomCorner());
_SetToNeighbourCorner(fRightBottomCrossing->RightTopCorner());
inline void _SetToNeighbourCorner(Corner* neighbour);