Unstructured grid generation 209 5 6 4 7 3 9 2 1 8 1 Fig. 8.25 Second front. 5 6 4 K 10 id 7 3 9 2 1 8 1 Fig. 8.26 Ideal point for side 2-3. 5 6 4 10 7 2 3 9 2 1 8 1 Fig. 8.27 Third front.