How do I install the Export Cad skill?

Run npx skillmds@latest add hongikarchi/export-cad in your terminal (requires Node.js), paste this page's agent-chat prompt into Claude, Cursor, or any MCP-connected agent, or download the SKILL.md file and copy it into your agent's skills directory.

Is Export Cad safe to use?

This skill has not completed SkillMD's automated safety review yet. SkillMD never runs a skill's scripts for you; review the SKILL.md before installing.

Which AI agents work with Export Cad?

This skill is tagged as working with Claude Code, Claude.ai, OpenAI Codex. SKILL.md is an open format, so most agents that read a skills directory can load it too.

Is Export Cad free to use?

Yes. Installing skills from SkillMD is free, and the skill stays under its author's original license.

Who published Export Cad?

hongikarchi (@hongikarchi) published this skill. Their other Agent Skills are listed on their SkillMD profile.

Export Cad by hongikarchi — Agent Skill

Name: Export Cad
Author: hongikarchi

Export Cad

Prepare and export the selected Rhino curves to CAD (DWG/DXF) — flatten every curve to z=0 (world XY) and convert curves to arcs + lines so AutoCAD doesn't receive NURBS with hundreds of control points, then export with a Lines-&-Arcs scheme. Non-destructive dry-run first, asks whether to work on a copy, then applies and exports. Trigger when the user wants to export/hand off to CAD / AutoCAD / DWG / DXF, flatten curves to z=0, or reduce control points for CAD. Fire on Korean or English requests, e.g. "캐드로 내보내기", "dwg export", "z 0으로 눌러", "커브 z값 0", "직선 아크로", "export to cad", "flatten to z0", "dwg/dxf 내보내기".

hongikarchi Updated Sep 22, 2026

File contents

export-cad

Prep the selected curves for CAD and export DWG/DXF. Script next to this file: exportcad_prep.py (dry-run by default, CAD_APPLY=True to apply). Two prep steps then an export command.

Steps

Model safety — ask each run (AskUserQuestion): work on a SaveAs copy (_-SaveAs a new .3dm via run_command, then operate there) or the current doc (prep is destructive: z-flatten + curve replacement). User's standing choice for exports is "ask every run".
Select the curves to export (or _SelAll then filter to curves — the script ignores non-curves).
Dry-run.
```
exec(open(r"<ABS>\exportcad_prep.py").read())
```
Reports selected curve count + how many are off z=0.
Apply prep.
```
CAD_APPLY=True; exec(open(r"<ABS>\exportcad_prep.py").read())
```
Flattens every curve to z=0 (Transform.PlanarProjection(Plane.WorldXY)) and converts to arcs+lines (Curve.ToArcsAndLines) so CAD gets clean geometry, not dense NURBS. Reports flattened / converted.
Export. run_command('_-Export "C:\\path\\plan.dwg" _Enter'). Pick a scheme:
- R12 Lines & Arcs — fewest vertices, arcs preserved (good for CAM/clean linework).
- FromIni — deterministic/headless: configure a scheme in AcadSchemes, export it to an .ini, set CurrentOption=y, then reference that .ini. Verify the exact scheme-name token against the live -Export prompt before hardcoding a macro (tokens vary by version/locale). Prefer _English tokens.

Gotchas (verified where noted)

Flatten + convert are deterministic RhinoCommon (no dialog): Transform.PlanarProjection + Curve.ToArcsAndLines(tol, angleTol, 0, 0). Verified: a z=50 arc flattens to z=0; a wiggly NURBS becomes ~42 arc/line segments; straight/arc curves stay as they are.
ToArcsAndLines returns None for some already-simple curves — the script keeps the flattened curve in that case (newc = pc if pc else c).
Prep is destructive (Objects.Replace) — hence the copy-vs-current prompt in step 1.
The -Export step is not fully auto-verifiable unattended (writes a file); run it with a known output path and confirm the scheme prompt live the first time.

Not yet implemented

Auto-picking/creating the DWG scheme .ini (currently a documented manual/one-time step).
Non-curve export (hatches/text/dims) — this skill is curve-focused; combine with export-* strip helpers if needed.

Reference

Built 2026-07-01 (task 6 of the 6-task suite). Flatten + arc/line APIs verified live on 260629 main ms.3dm. See memory rhino-export-mechanics and the plan.

---name: export-caddescription: Prepare and export the selected Rhino curves to CAD (DWG/DXF) — flatten every curve to z=0 (world XY) and convert curves to arcs + lines so AutoCAD doesn't receive NURBS with hundreds of control points, then export with a Lines-&-Arcs scheme. Non-destructive dry-run first, asks whether to work on a copy, then applies and exports. Trigger when the user wants to export/hand off to CAD / AutoCAD / DWG / DXF, flatten curves to z=0, or reduce control points for CAD. Fire on Korean or English requests, e.g. "캐드로 내보내기", "dwg export", "z 0으로 눌러", "커브 z값 0", "직선 아크로", "export to cad", "flatten to z0", "dwg/dxf 내보내기".---# export-cadPrep the **selected curves** for CAD and export DWG/DXF. Script next to this file:`exportcad_prep.py` (dry-run by default, `CAD_APPLY=True` to apply). Two prep steps then an exportcommand.## Steps1. **Model safety — ask each run** (AskUserQuestion): work on a **SaveAs copy** (`_-SaveAs` a new `.3dm` via `run_command`, then operate there) or the **current doc** (prep is destructive: z-flatten + curve replacement). User's standing choice for exports is "ask every run".2. **Select** the curves to export (or `_SelAll` then filter to curves — the script ignores non-curves).3. **Dry-run.** ```python exec(open(r"<ABS>\exportcad_prep.py").read()) ``` Reports selected curve count + how many are off z=0.4. **Apply prep.** ```python CAD_APPLY=True; exec(open(r"<ABS>\exportcad_prep.py").read()) ``` Flattens every curve to z=0 (`Transform.PlanarProjection(Plane.WorldXY)`) and converts to arcs+lines (`Curve.ToArcsAndLines`) so CAD gets clean geometry, not dense NURBS. Reports flattened / converted.5. **Export.** `run_command('_-Export "C:\\path\\plan.dwg" _Enter')`. Pick a scheme: - **`R12 Lines & Arcs`** — fewest vertices, arcs preserved (good for CAM/clean linework). - **`FromIni`** — deterministic/headless: configure a scheme in `AcadSchemes`, export it to an `.ini`, set `CurrentOption=y`, then reference that `.ini`. **Verify the exact scheme-name token against the live `-Export` prompt** before hardcoding a macro (tokens vary by version/locale). Prefer `_English` tokens.## Gotchas (verified where noted)- **Flatten + convert are deterministic RhinoCommon** (no dialog): `Transform.PlanarProjection` + `Curve.ToArcsAndLines(tol, angleTol, 0, 0)`. Verified: a z=50 arc flattens to z=0; a wiggly NURBS becomes ~42 arc/line segments; straight/arc curves stay as they are.- **`ToArcsAndLines` returns None** for some already-simple curves — the script keeps the flattened curve in that case (`newc = pc if pc else c`).- **Prep is destructive** (`Objects.Replace`) — hence the copy-vs-current prompt in step 1.- **The `-Export` step is not fully auto-verifiable** unattended (writes a file); run it with a known output path and confirm the scheme prompt live the first time.## Not yet implemented- Auto-picking/creating the DWG scheme `.ini` (currently a documented manual/one-time step).- Non-curve export (hatches/text/dims) — this skill is curve-focused; combine with `export-*` strip helpers if needed.## ReferenceBuilt 2026-07-01 (task 6 of the 6-task suite). Flatten + arc/line APIs verified live on`260629 main ms.3dm`. See memory `rhino-export-mechanics` and the plan.

Frequently asked questions