Complete rework of parts and further questions

[Manfred Schaefer]

I don't get it.
Your example is corrupt, and there are no triangles in 2-4ring6. Only 8 quads.

You are right. The primitive in question here is the primitive 2-4disc.dat. The question remains, however, whether this primitive can be generated by two primitives 1-4disc.dat

1 4 0 0 0 0 0 1 0 0 0 0 0 1 0 0 0 0 1 1-4disc.dat
1 4 0 0 0 0 0 0 -1 0 0 1 0 1 0 1 0 0 0 1-4disc.dat

And, in this case, can the triangles be replaced by quadrilaterals?

Regards

Manfred