CypherNaugh_0x 9508ee749c Shell refuses a wall thicker than a rim instead of returning a corrupt body: the topology-preserving face offset now checks every planar face's moved loops, and a loop that turns inside out or two loops that cross (a rim or ledge narrower than the move, e.g. a bowl opening sliding past the slab's outer edge) is an error naming the spot. Before, the self-crossing cavity went into the boolean and the shelled body came back with roughly twice its volume and its centre of mass outside the body, so every later cut failed its volume check ...

The check is geometric, not a tuned threshold: on the reported basin (18 mm rim, sloped bowl wall) the rim strip reaches zero width at 15.17 mm and the shell is refused from there on. Tolerances only absorb rounding (scaled to the body size), and at most 2000 straight edges per face are compared pairwise. Arc edges and curved faces are not checked.

This is a guard, not the full fix. Building such a shell needs the offset to change topology: drop the strip that collapses and let its neighbours meet, as offset_body already does for rounds thinner than the move, extended to planar faces. That is substantially more work in the most delicate part of the kernel (rims, ledges, steps, arc-bounded strips) and is left for a separate change; until then the workaround is to model the hollow directly (an offset loft and a box cut).

2026-10-10 12:32:03 -04:00

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src

Shell refuses a wall thicker than a rim instead of returning a corrupt body: the topology-preserving face offset now checks every planar face's moved loops, and a loop that turns inside out or two loops that cross (a rim or ledge narrower than the move, e.g. a bowl opening sliding past the slab's outer edge) is an error naming the spot. Before, the self-crossing cavity went into the boolean and the shelled body came back with roughly twice its volume and its centre of mass outside the body, so every later cut failed its volume check

2026-10-10 12:32:03 -04:00

Cargo.toml

M0: truck-based kernel with local fillets and chamfers, parametric document timeline

2026-10-07 17:18:16 +00:00