Locks
Locks pin the inputs that a feature depends on, so rerolling everything else preserves that feature exactly. The Locks chip sits at the top of the Build panel.
What you can lock
Section titled “What you can lock”- Coastline — keeps the heightmap and waterline.
- Rivers — keeps every river in place. Auto-locks Coastline.
- Forests — keeps the forest layout.
- Mountains — keeps the mountain ranges.
- Settlements — keeps every city / town / village in the same spot with the same names.
- Labels — keeps every printed label. Auto-locks settlements + style (label fonts come from the style).
How locks cascade
Section titled “How locks cascade”A lock pins the inputs the feature depends on, which often pins inputs upstream too. Locking Rivers, for example, also auto-locks Coastline because rivers are derived from the heightmap.
The UI shows auto-locked features in a softer amber state so you can tell user-set locks from cascaded ones.
The cascade map:
| Lock | Also pins |
|---|---|
| Coastline | Kind, water amount, terrain drama |
| Rivers | Coastline + river amount |
| Forests | Coastline + forest amount |
| Mountains | Coastline + mountain amount |
| Settlements | Coastline + climate-axis fields + rivers + settlement density |
| Labels | Settlements-locked fields + label density + style |
Inputs that are pinned get visibly disabled in the Build tool — you can’t change Water amount once Coastline is locked, for instance.
How locks work
Section titled “How locks work”-
Generate a map. When you find one you like, click the Lock chip for the feature you want to keep.
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Reroll, change the style, tweak sliders — anything that isn’t pinned by your lock is free.
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Generate again. The locked feature regenerates byte-identical because every input it depends on is pinned.
To release a lock, click its chip again. Toggling the first lock
snapshots (seed, kind, settings); releasing the last lock releases
the snapshot.
Recipes
Section titled “Recipes”Keep the continent, reroll cities
Section titled “Keep the continent, reroll cities”Lock Coastline. Hit Reroll. Same landmass, different cities.
Keep the cities, restyle
Section titled “Keep the cities, restyle”Lock Settlements. Change Style in the Build tool. Same cities with the same names, new visual treatment.
Keep the whole map, only re-roll vegetation
Section titled “Keep the whole map, only re-roll vegetation”Lock Settlements AND Mountains AND Rivers. Reroll. Only forests / biomes shift.
What locks can’t pin
Section titled “What locks can’t pin”- Aspect ratio and pixel size — canvas dimensions are never frozen because they re-sample the noise space.
- Decorations (Decorate tool) — independent of generator inputs, kept across rerolls automatically.
- Painted regions (Paint tool) — survive rerolls within the same seed but get cleared when the seed changes.
Related
Section titled “Related”- Build tool — fields disabled by an active lock.
- Variations — uses locks to flip through alternative seeds while keeping the rest of your settings.