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solidcraft-sweep-and-boolean-hangs

Use when a SolidCraft model needs solid.sweep (twist, scale, vases, cups, pipes) or any cut or join on a swept or very-high-face-count body, to avoid hangs that need an app restart.

skills/solidcraft-sweep-and-boolean-hangs/SKILL.md

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Nov 2, 2026
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Apache-2.0

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# SolidCraft: sweep recipes and boolean hang avoidance

Use with `solidcraft-modeling` and `solidcraft-tutorial-recipes`. Validated on public sweep tutorials (a twisted vase and a hex cup) and consistent with the timed-test lessons in `solidcraft-speed-modeling-lessons` (joins with coincident circular faces hang the app).

## 1. Sweep recipe (MCP)
1. Profile sketch on the plane where the profile lives (XY, or XY with an offset when it sits on top of a base).
2. Path sketch as a SEPARATE sketch on an upright plane `{origin:[0,0,0], x_dir:[1,0,0], y_dir:[0,0,1]}`: `sketch.line [[0,0],[0,H]]`.
3. `solid.sweep {sketch:"Profile", profiles:[{point:[x,y]}...], path_sketch:"Path", path:["l1"], twist:"90 deg", scale:2.2, operation:"new", body_name:"X"}`. Pick every closed region with a point inside it (for crossing arcs or circles pick all the lens regions and the ring).
4. Always use `operation:"new"`. A sweep joined to another body is a Boolean and very slow (the tutorial author says the same).
5. `measure` right after: the bbox height is the path length (plus the base), compare the volume with a numeric estimate. 400-1000+ faces are normal for twisted bodies.

## 2. Verified examples
- **Hex cup:** hexagon across flats 40 (`sketch.polygon.inscribed radius 23.0940108 sides 6 angle 0`), `sketch.fillet` R4 on the 6 corners, `sketch.offset` 2 inward (2 profiles give a wall ring), path 80 mm, twist 90 deg, end scale 2.2, profile pick [0,19]: 55 612.7 mm3, z 0-80. The transcript said 14 / 18 / 19 but the frames show 40 / 80 / 90. Bottom: `solid.extrude` of the outer profile 2 mm negative as a separate body (2 760.9 mm3).
- **Vase:** base dia 120 x 10. Profile sketch on XY offset 10 with circles r50 and r45 plus 8 arcs R6 (centres on the r49.6387 circle every 45 deg). Path 120 mm, twist 100 deg, scale 2, new body: 537 948 mm3, z 10-130.