A revolution comes back from rsweep as three 120-degree segment faces,
but every hole was attached to the first of them. A window wider than a
segment cannot sit on one face, so that face turned invalid and its
whole third of the tube vanished -- the pump's cylinders lost 120
degrees of wall each and the solid read as open where they met the body.
One of them shed a segment with no hole involved at all, so chasing the
individual causes would not have covered it.
Measure the result instead: after a cone face whose boundary closes the
revolution is triangulated, check that the meshed vertices actually span
it, and hand the face to the parametric sampler when they do not. That
catches a tear whatever produced it, while genuinely partial cones and
every non-cone surface pass straight through -- the tee's pierced run
cylinder still meshes through the kernel.
Also bring truck's chord tolerance in line with the detailed LOD. Truck
emits a single mesh rather than an LOD ladder, so a tenth of the radius
left a wide pipe as a hexagonal prism whose flats sank nine units inside
the true surface, pulling the wall away from the caps and planar faces
that meet it.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
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