## Description:
Relates to #3725
Adds a new **Impassable** terrain type that enables non-rectangular maps
and creates impassable barriers on the map. Painted with pure black
(`#000`) in the map editor's `image.png`.
**Encoding:** Impassable terrain is encoded in the binary format as
`isLand=1, magnitude=31` (previously unused). The Go map generator
detects `#000` pixels and produces this encoding. The map generator's
minimap downscaling gives impassable highest priority (Impassable >
Water > Land). Thumbnails render impassable as transparent so the map
picker background shows through.
**Rendering:** Impassable tiles render as the map background colour
(`rgb(60, 60, 60)`, matching `gl.clearColor` in `Renderer.ts`), making
them visually indistinguishable from the area outside the map quad. This
enables maps to appear non-rectangular.
**Gameplay restrictions:** Impassable terrain cannot be:
- Owned (`conquer()` throws)
- Attacked (`AttackExecution` skips impassable tiles in both `tick()`
and `addNeighbors()`)
- Nuked (targeting rejected in `nukeSpawn()`, blast radius filtered in
`tilesToDestroy()`)
- Spawned on (nations, human players, and structures all reject
impassable tiles)
- Converted to water (guarded in `WaterManager` and `setWater()`)
**Nuke trajectories:** Nuke trajectories cannot cross impassable
terrain, matching the existing map-border enforcement. This is checked
at launch time in `NukeExecution.tick()`. The client-side trajectory
preview turns red with a red X where the arc crosses impassable terrain
(reusing the existing SAM-intercept visual pipeline in
`NukeTrajectory.ts`). The nuke ghost preview is completely hidden when
hovering over impassable terrain (same as hovering outside the map).
https://github.com/user-attachments/assets/ff131146-9749-41e0-892a-617e5cd16c54
Impassable terrain is transparent on the thumbnail:
<img width="213" height="152" alt="Screenshot 2026-06-18 211640"
src="https://github.com/user-attachments/assets/ede16f8c-9239-4ab1-be5d-0ba81cce5e9e"
/>
Tested with water nukes, made sure there is no water depth gradient near
the impassable terrain, just like at the world border:
<img width="774" height="771" alt="Screenshot 2026-06-18 212348"
src="https://github.com/user-attachments/assets/4429069d-911b-48e8-91e3-7307d42c9397"
/>
Models used: GLM 5.2 and MiMo 2.5 Pro 😄
## Please complete the following:
- [X] I have added screenshots for all UI updates
- [X] I process any text displayed to the user through translateText()
and I've added it to the en.json file
- [X] I have added relevant tests to the test directory
## Please put your Discord username so you can be contacted if a bug or
regression is found:
FloPinguin
## Description:
Removed single pixel line from the bottom of LA map.
Added L.A.X. nation to LA map.
Removed USSR flags from Dyslexdria (originally imported from giant world
map). Left USSR flag on 'Rusha' only.
## Please complete the following:
- [x] I have added screenshots for all UI updates
- [x] I process any text displayed to the user through translateText()
and I've added it to the en.json file
- [x] I have added relevant tests to the test directory
- [x] I confirm I have thoroughly tested these changes and take full
responsibility for any bugs introduced
## Please put your Discord username
PlaysBadly
## Description:
Add Map - Los Angeles (With Roads)
Whats NY without LA? What is LA without its roads? Here is a larger map
where I have turned LAs road network into rivers. Nations named to areas
of the city or surrounding area. Map geo data is from OpenTopography. I
stenciled the highways from screenshots of online maps and some artistic
choice.
https://discord.com/channels/1284581928254701718/1482605671697613081/1482605671697613081https://www.youtube.com/watch?v=6td9wiQKE9s
## Please complete the following:
- [x] I have added screenshots for all UI updates
- [x] I process any text displayed to the user through translateText()
and I've added it to the en.json file
- [x] I have added relevant tests to the test directory
- [x] I confirm I have thoroughly tested these changes and take full
responsibility for any bugs introduced
##Discord username
PlaysBadly
---------
Co-authored-by: evanpelle <evanpelle@gmail.com>
FloPinguin