6 
convex 
6
1  0.0  0.0 0.1 0.
2  0.1  0.0 0.1 0.1
3  0.1  0.1 -0.1 0.1
4 -0.1  0.1 -0.1 -0.1
5 -0.1 -0.1 0. -0.1
6  0.  -0.1 0.0  0.0
