hi Riccardo, like others said: voxels can get you there, but then you have a whole of a busy bumpy mess. We use voxels with the GH plugin Dendro to shell parts for SLA, and we only use the inner voxel surfaces with the outer original meshes so we don’t mind that they are messy. Like this:
To do what you show above Rhino would need an unsubdivided command, so you can subdivide one or two levels, do your offset (without bowties), and then unsubdivide again.
Simple tool missing: Unsubdivide
A powerful SubD modeler should have an unsubvidive tool for many situations like this, also to create assets at various LODs (levels of detail).
Here’s how it works (only on quads of course) in Blender:
and in Modo:
@theoutside, I think that if the typists reverse the code of the subDivide tool then can get the unsubdivide tool for almost free. Can you please ask them to do that? thx!
G