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Geological map: units from contacts and label points (whole body) #843
Description
Geological mapping in PRo3D, following the contacts-and-points method (as in the QGIS plugin Mappy): the geologist draws contacts (polylines) and places label points carrying a geological unit; PRo3D derives the units (polygons with holes) from them, fills them on the terrain, and exports them. Refining a map means drawing another contact across a unit - no polygon editing, shared boundaries are traced once.
Decisions so far
- Source: one annotation group per map; its polylines are contacts, its points labels. Unit code in a new dedicated annotation field (
geoUnit, new scene key). GeologicalMapscene object: source group, unit table (code -> name, colour, description). Derived units are not persisted, regenerated on load.- Whole-body maps (Dimorphos first): faces are found with local operations only - intersections between contact segments, angular order of edges at each node in its tangent plane, label point -> nearest contact + side - and traced in a half-edge structure on the surface. No global chart, no pole/date-line problems, no NetTopologySuite in the core.
- Units render through the one-draw deferred fills of Annotation fills z-fight with the terrain #841/Annotation fills drawn onto the terrain: offscreen surfaces + one-draw fills (#841) #842, as radial shell volumes (rings with holes).
- Regenerate explicitly first; diagnostics in 3D: unlabelled units, conflicting labels, dangling contacts.
- Export: GeoPackage/GeoJSON (units with holes, contacts, labels); the lon/lat split at date line and poles happens only there.
- Contact type/certainty: later.
Plan: docs/dev/GeologicalMap-plan.md on the feature branch. Depends on #842.
Activity
haraldsteinlechner commentedon Oct 13, 2026
Plan: docs/dev/GeologicalMap-plan.md on branch
features/843_geological-map(stacked on #842).docs(#843): plan - immutable map, UX decisions
feat(#843): topology core - map faces from contacts on the whole body
feat(#843): geological maps, step 1 - see a map
feat(#843): geological maps, step 1 - see a map
feat(#843): geological maps, step 2 - the Assign unit tool
feat(#843): snapping contacts, problem list, open-end markers
feat(#843): unit codes written inside the units
feat(#843): split preview while drawing a contact
fix(#843): Geological Maps panel in the dark theme - inverted segment…
fix(#843): review findings - robustness of topology, volumes, JSON an…
feat(#843): snapping feedback under the cursor; ellipses are contacts
docs(#843): geological map story - from an empty group to a checked m…
docs(#843): story - a crater as a unit inside a unit, connecting line…
docs(#843): the story is a made-up example - say so up front
docs(#843): story with neutral units A-E, tightened text
docs(#843): story text - neutral, tightened
docs(#843): handover; docs current - cursor snapping, ellipses as con…
test(#843): story video - full UI, pointer and captions, waits cut
test(#843): story video pacing - waits cut, captions and results hold
fix(#843): a Sky polygon's closing edge is sampled onto the surface
feat(#843): geological maps are experimental - the panel opens behind…
feat(#843): warn when a contact is drawn with Linear projection
fix(#843): importing annotations keeps their maps; units only for the…
docs(#843): Limitations in the user doc, all open gaps in one list
fix(#843): self-review - closing edge by endpoints, import ids, one gate