Gap and primitive.

[Bertrand Lequy]

It's difficult to give good advice without seeing the data - can you share the file - or better another simplified one showing the problem?

thank you for your answer, here it is : (I colored the primitives in green and the problematic quads in red, the vertical ones are realy thin)

Code:

0 // 140-144
1 16 2.5 144 5.25 2 0 0 0 -1 0 0 0 -2 2-4ndis.dat
1 16 2.5 144 5.25 2 0 0 0 1 0 0 0 -2 2-4edge.dat
0 BFC INVERTNEXT
1 16 2.5 144 5.25 2 0 0 0 -4 0 0 0 2 4-4cyli.dat

0 // 144
3 16 0.5 144 5.25 0.649 144 6 0.5 144 6
3 16 4.351 144 6 4.5 144 5.25 4.5 144 6
2 24 0.649 144 6 0.5 144 6
2 24 0.5 144 5.25  0.649 144 6
0 // 144-148
1 2 2.5 148 5.25 1.848 0 -0.765 0 -4 0 0.765 0 1.848 3-8cyli.dat
4 4 0.649 148 6 0.6522 148 6.0154 0.6522 144 6.0154 0.649 144 6
4 16 0.649 148 6 0.5 148 6 0.5 144 6 0.649 144 6
4 4 4.351 148 6 4.3478 148 6.0154 4.348 144 6.015 4.351 144 6
4 16 4.351 148 6 4.5 148 6 4.5 144 6 4.351 144 6
2 24 0.649 148 6 0.649 144 6
2 24 4.351 148 6 4.351 144 6

0 // 148
0 BFC INVERTNEXT
1 2 2.5 148 5.25 0 0 -2 0 1 0 2 0 0 3-16ndis.dat

0 0.6522 148 6.0154 <----------------------------first problematic vertex

0 BFC INVERTNEXT
1 2 2.5 148 5.25 0 0 2 0 1 0 2 0 0 3-16ndis.dat

0 4.3478 148 6.0154 <----------------------------second problematic vertex

0 BFC INVERTNEXT
1 16 2.5 148 5.25 1.848 0 -0.765 0 1 0 0.765 0 1.848 3-8edge.dat
4 4 0.5 148 6 0.5 148 7.25 0.6522 148 6.0154 0.649 148 6
4 4 4.351 148 6 4.3478 148 6.0154 4.5 148 7.25 4.5 148 6
2 24 0.6490196 148 6 0.6522 148 6.0154
2 24 0.6490196 148 6 0.5 148 6
2 24 4.351 148 6 4.3478 148 6.0154
2 24 4.351 148 6 4.5 148 6
2 24 4.351 144 6 4.5 144 6
2 24 4.351 144 6 4.5 144 5.25