DrawTrSurf_BSplineSurface
9 0 0 0 0 2 3 3 4 2 2 0 0 0  0 10 2  0 20 10  0 30 0  
10 0 5  10 10 3  10 20 20  10 30 0  
20 0 0  20 10 2  20 20 10  20 30 0  

0 3
1 3

0 4
1 4


0

