Hi Bud,

> is this problem of detecting circle in Alibre of imported STEP file resolve yet?

I'm not really 100% sure - but this discussion thread is 4 years old and I don't think that it has been mentioned as a problem for quite a while now. So it's possible that it has been tuned up in the Alibre STEP importer since then.

I don't know for certain though, I'd recommend testing it yourself with one of your specific models to make sure it does what you need.

If it does not work correctly, try going in MoI to Options > General and push the "Edit .ini file" button and go to the [NURBS Export] section and set:

[NURBS Export]
WriteAnalyticCurves=y
WriteAnalyticSurfaces=y


It kind of looks like the circle case for analytic curves is still not handled in the import/export library, but it does seem to be active for surfaces, with a cylinder then getting written out as a specific cylinder surface entity in the generated STEP file and not as a generic NURBS surface. That could possibly help if Alibre is not recognizing the surfaces as cylinders automatically itself.

- Michael