It's because its sides have a null thickness. Thus only the half round upper part is taken into account, and once scaled along the total height of the door, it gives the shape seen in the image. Not sure I'll try to fix that bug because if that door was filled "as expected", it still wouldn't be very interesting, right?

Ah, yes, that would make sense. Thanks, I wondered about that.

And quite right, as the models with wall elements are now superfluous, protrution can be set with doorOrWindow......# etc properties and proper cutout can be adjusted, it is certainly no longer interesting to save these old workarounds.

Yes, I even added the SVG cutout for the 3 other non-rectangular windows, because it runs faster.

Good to know (for puritans). And examples even better...

But then, rectangular models are still cut correctly even if they are not closed (like the doorframe without threshold)? And have no need for a default (M0,0 v1 h1 v-1 z or something) cutout?

Thanks again.

ok