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Kernel rig: the trough and the pocket whose floors fall to a drain build

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SMLib now offsets a vertex where four faces meet (two walls and two facets at the floor's
corners, four facets at the drain) to two vertices joined by a new edge (tangency-labs/smlib
branch smlib-shells). Both volumes match their closed forms. The pocket's lining, hanging from
the top's rim round the pocket, stands apart from the slab's outer walls with the cavity rising
between them to the open top: the case says two shells in the one body.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
This commit is contained in:
jyviko
2026-10-31 01:28:23 -04:00
committed by jyviko
parent 1d818a2d1e
commit 8550ac7e40
2 changed files with 2 additions and 3 deletions
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tests/kernel-cases/shell/KNOWN_FAILING
-2
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@@ -8,6 +8,4 @@
616-shell-open-a-rib-side-face-of-a-lid SMLib status 1001
cov-shell-again-open-at-an-inner-wall-of-a-shelled-box SMLib status 1001
cov-shell-plate-with-a-hole-through-its-arc-side SMLib status 1001 where the hole's wall meets the arc side
cov-shell-pocket-whose-floor-falls-to-a-drain SMLib status 1001 where four faces meet at the pocket floor's corners
cov-shell-trough-whose-floor-falls-to-a-drain SMLib status 1001 where four faces meet at a corner
cov-shell-up-down-joined-squares-open-at-a-side-wall SMLib status 1001
tests/kernel-cases/shell/cov-shell-pocket-whose-floor-falls-to-a-drain/expected.json
+2 -1
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@@ -2,8 +2,9 @@
"sources": [],
"what": "a slab 140 x 90 x 50 with a 30 mm pocket whose floor falls 1 deg from its edges to a central drain (four faces meet at each of the pocket floor's concave corners), shelled 3 mm open at the top",
"source": "analytic",
"method": "The floor below z = 0 is a pyramid, apex at the centre h = 30 tan 1 deg = 0.523652 below: two triangular prisms (a triangle on XZ swept along y, one on YZ swept along x) intersected. Slab 140 x 90 x 50 less the pocket x 20..120, y 15..75 down to z = 20 and the pyramid below it: V0 = 630000 - (100 60 30 + 100 60 h/3). Shell 3 open at the top, offset faces extended to meet: the cavity is x 3..137, y 3..87 from z = 3 up to the top, except over the pocket's walls moved 3 out (x 17..123, y 12..78), where it rises only to the pocket's floor facets moved 3 down (their max, exactly over the cells where each is highest): cavity 297136.906075. V = 151815.790029",
"method": "The floor below z = 0 is a pyramid, apex at the centre h = 30 tan 1 deg = 0.523652 below: two triangular prisms (a triangle on XZ swept along y, one on YZ swept along x) intersected. Slab 140 x 90 x 50 less the pocket x 20..120, y 15..75 down to z = 20 and the pyramid below it: V0 = 630000 - (100 60 30 + 100 60 h/3). Shell 3 open at the top, offset faces extended to meet: the cavity is x 3..137, y 3..87 from z = 3 up to the top, except over the pocket's walls moved 3 out (x 17..123, y 12..78), where it rises only to the pocket's floor facets moved 3 down (their max, exactly over the cells where each is highest): cavity 297136.906075. The pocket's lining (its walls and floor, 3 thick, hanging from the top's rim round the pocket) stands apart from the slab's outer walls, the cavity rising between them to the open top: two lumps in the one body. V = 151815.790029",
"body_count": 1,
"shells": 2,
"volume_mm3": 151815.7900294403,
"tolerance": {
"rel": 1e-05