Or even better, skip the middle man and set the probability expression on the tile directly

data.raw.tile["fulgoran-dunes"].autoplace.probability_expression = "if(x_from_start^2 + y_from_start^2 < 2, 1, -1000)"

I had been digging around the map gen and noise expressions, but your mention of tiles led me down a good path. The elevation and code I had posted before is relevant, but it's only part of the puzzle.

In addition to the elevation piece posted earlier, I also turned off all tiles on Fulgora except ...

I'm trying to have a mod setup "seablock"-style map gen for every planet - a single tile of land surrounded by whatever that planet's "ocean" is - lava on Vulcanus, oil on Fulgora, etc. So far I've got this, which works great for Nauvis and does exactly what I want:


data:extend({{
type = "noise ...

The prototype definitions for SpacingItem in the 2.0.21 version have the new SpacingItem type with properties index of type uint32_t and spacing of type int32_t. Likely a bug and the _t suffix should be removed?