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Regenerate the committed MJCF snapshot models/stackchan/stackchan.xml from params.py after physical parameters change, then show the diff. Use after editing params.py or model.py.
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| name | regenerate-model |
| description | Regenerate the committed MJCF snapshot models/stackchan/stackchan.xml from params.py after physical parameters change, then show the diff. Use after editing params.py or model.py. |
models/stackchan/stackchan.xml is a committed snapshot of the default profile,
generated from params.py via model.write_model(...). It is NOT hand-edited
(a PreToolUse hook blocks manual edits). Whenever params.py or model.py
changes in a way that affects the default profile, regenerate the snapshot so it
stays in sync with the single source of truth.
Regenerate the default snapshot (default profile = report, servo =
SCS0009, written with meshdir="meshes"). The package is not installed
into the venv, so add src to the path (mirrors how scripts/ and
tests/conftest.py import it):
uv run python -c "import sys; sys.path.insert(0, 'src'); from stackchan_sim import model; print(model.write_model('models/stackchan/stackchan.xml'))"
To regenerate a non-default profile/servo, pass them explicitly:
uv run python -c "import sys; sys.path.insert(0, 'src'); from stackchan_sim import model; model.write_model('models/stackchan/stackchan.xml', profile='report', servo='SCS0009')"
Show what changed so the diff can be reviewed before committing:
git diff -- models/stackchan/stackchan.xml
Sanity-check that the model still loads and the tests pass:
uv run pytest -q
src to sys.path because the package is not installed
into the venv (run uv sync first if MuJoCo/numpy imports fail).Add a new servo spec or mass profile to params.py, then regenerate the model and verify. Use when asked to add/support a new servo (e.g. a new Feetech/Dynamixel model) or a new mass profile to the Stack-chan simulator.
Pre-publish OSS compliance check — verifies secrets/artifacts are gitignored, LICENSE/NOTICE/THIRD_PARTY_NOTICES exist, no secrets or personal info are about to be committed, and tests pass. Use before publishing/committing for release or when asked to audit OSS readiness.
Visually verify the Stack-chan web UI / on-monitor face by launching the emulator and capturing Playwright screenshots into artifacts/. Use after changing web/ (face_renderer.js, scene.js, app.js, compat.py, contract.py) or when asked to confirm the face/expressions/dashboard render correctly.