zwitschi
ece48649f5
Tools/terrain_from_dem.py builds a 191x106 grid at 2 m over the block, Z being NAVD88 minus the origin ground. Building footprints from the OSM extract are cut out so rooftops never become terrain (72 footprints, 6310 cells). Spot checks reproduce the measured profile: origin 0.00, Orange Dr +3.39, south gutter +0.93, crown +1.38, north sidewalk +1.43. Blosm projects with a sphere, not an ellipsoid, so its frame was ~0.4% oversized and rotated by meridian convergence: about 2 m at the theatre. The blockout now fits a six-parameter affine into EPSG:26911 on five control points (0.0 cm residual) and transforms root objects only, since children inherit and double transforming them read as a 2 m placement error.
Tools
Repeatable import/export and processing helpers. Anything that was done twice by hand belongs here.
Conventions
- One script, one job. No interactive prompts; every input is an argument.
- Each script documents its input format, output format, and the exact tool version it was tested with.
- Blender scripts run headless (
blender --background --python), so they can be re-run for a regression check. - No credentials, no absolute machine paths, no writes outside the project by default.
- A script that produces game content logs what it produced, so
Game/Contentcan be audited against it.
Helpers
check-lfs.sh— repository guard: fails ifgit-lfsor thelfsfilter is missing, or if an LFS-tracked file was committed as a plain blob.blosm_blockout.py— headless Blosm import of the committed.osmextract into a.blend, with a per-building scale report. Exact invocation inArt/blender/README.md.commons_fetch.py— Wikimedia Commons reference fetcher. Search or exactFile:titles, 1600 px thumbnails, provenancesidecar.jsonper folder. Writes only into the gitignoredArt/reference/; reference images are never committed.
Planned helpers
- Blender export preset runner (named presets, metric scale assertion)
- Blender→Unreal scale test (export a known-size cube, verify 100× conversion)
- OSM extract fetch and manifest writer (records date, bounds, checksum)
- QGIS processing steps as batch scripts, so the geo cleanup is reproducible rather than GUI-only