private void calculateTriangleTypes()
	{
		for (DelaunayTriangle triangle : base.getTriangles())
		{
			int nrOfNeighbours = getNumberOfInternalNeighbours(triangle);
			if (nrOfNeighbours == 1)
				t.add(triangle);
			else if (nrOfNeighbours == 2)
				s.add(triangle);
			else if (nrOfNeighbours == 3)
				j.add(triangle);
		}
	}