Hi Michael,

Like said previously, this is a situation were I end up wanting displacement and is wasn't planned, or that it would very long to produce the geometry in a polygonal software.

Here are other examples with the cylinder,
When dicing very small, the vertex normal breaks make funky artefacts.
When dicing very small and unwelding vertices small openings appear.






Anyway this situation doesn't happens often and I'm a happy camper.
Just experimenting a bit. :-)

Thanks for the hints!!

Marc