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3MF: export, and 3MF/STL import as mesh bodies

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Export: ExportCommand/CLI --out/MCP export with .3mf write a 3MF Core package
([Content_Types].xml, _rels/.rels, 3D/3dmodel.model; millimetres), one
mesh object and build item per body, named after it, vertices shared and
welded watertight (T-junctions between faces split), base-material colours
when bodies carry one (STEP colours now ride on bodies). Tessellation as
for STL. File > Export 3MF.

Import: doc.open/drag-drop/CLI/MCP open accept .3mf and .stl; Insert Mesh
(ParaMeshInsertAlignCommand) adds them to a design as a MeshImport feature.
Kernel mesh bodies render, measure exactly, move and export; solid
features refuse them with a clear error. 3MF reading flattens components
and build transforms, converts units, reads colours; sizes, entries,
nesting and element counts are capped.

Co-Authored-By: Claude Opus 5.5 <[email protected]>
Claude-Session: https://claude.ai/code/session_01AS5Tn3xieewUSg3uxrMVdL
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bherbruckandClaude Opus 5.5 committed 2026-10-07 21:30:38 +00:00
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@@ -56,10 +56,10 @@ Claude Desktop (`claude_desktop_config.json`), bridged to a running app:
| `body_topology` | `body` | Edges (index, midpoint, length, ends) and faces (index, area, centroid, normal). An edge midpoint is the `[x,y,z]` that picks that edge for fillet and chamfer. |
| `set_parameter` | `name`, `value` (number or expression), `unit?`, `comment?` | Create or change a user parameter and recompute; reports features that now fail. |
| `screenshot` | `view?` (iso, top, front, back, bottom, left, right, home, fit), `path?`, `width?`, `height?`, `source?` (window, model) | A PNG image content block. Headless: CPU render fitted to the model. Bridged: the app window (default) or a model render with the app's camera. |
| `export` | `path`, `format?` (step, stl, stla, obj), `bodies?` | STEP or mesh export. |
| `export` | `path`, `format?` (step, 3mf, stl, stla, obj), `bodies?` | STEP, 3MF or mesh export. |
| `undo`, `redo` | — | Undo / redo one change. |
| `new_design` | `name?` | Start an empty design. |
| `open` | `path` | Open a `.solvecraft` design, or a STEP file (`.step`/`.stp`) as a new design holding its bodies (an Import base feature). |
| `open` | `path` | Open a `.solvecraft` design, a STEP file (`.step`/`.stp`) as a new design holding its bodies (an Import base feature), or a 3MF/STL file as mesh bodies. |
| `save` | `path?` | Save the design (to its current file without `path`). |
Resources: `solvecraft://design` (inspect JSON with measurements) and `solvecraft://commands`