Clipping Section buggy at large scales

I’m getting a problem with an architectural site survey, created at actual size in mm. When I create a ClippingSection, my objects display as open/hollow (no face is created at the section). My objects are closed polysurfaces (extruded patch surfaces). When I make a simple box in the file it clips fine.

I don’t seem to have the same problem if I scale the model down, say by 1000. Ideally I want to work at 1:1 scale though.

If I raise the model units absolute tolerance significantly I the problem goes away.

Rhino 8 SR6 2024-4-10 (Rhino 8, 8.6.24101.05001, Git hash:master @ 32c244aa711e0034e75bec2e87d093c764820b96)
License type: Educational, build 2024-04-10

Hi William,

Can we get your full system info and the file? If you require it to private, please upload to mcneel here with a link to this thread in the comments.