Simple model. Why does "toSubD" fail?

I find myself with a little free time and decided to play with WIP SubD again. Simple cup model will not convert to SubD. Why?
Do I have to convert to mesh first?

test.3dm (663.9 KB)

Hello - it does not fail, it asks for meshes, surfaces or extrusions - the object is a polysurface, so only it’s faces can be selected one at a time. A way out would be to QuadRemesh the thing and ask for SubD output.


-Pascal

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