void CleanDownwardConnectivity();
void BuildDownwardConnectivity(bool withEdges);
int GetNeighbors(int* neighborsVtkIds, int* downIds, unsigned char* downTypes, int vtkId, bool getSkin=false);
void CleanDownwardConnectivity();
void BuildDownwardConnectivity(bool withEdges);
int GetNeighbors(int* neighborsVtkIds, int* downIds, unsigned char* downTypes, int vtkId, bool getSkin=false);