50% Rarer Modded Structures — Minecraft 1.21.1 / NeoForge

Install: place this ZIP (do not unzip) in your WORLD's datapacks folder, then restart the world/server. Check /datapack list to confirm it is enabled.
Minecraft 1.21.1 data pack format: 48.

What changed: Overrides structure-set JSON definitions from the uploaded mods. The spacing of every supported spacing-based structure placement is increased to round(original spacing × sqrt(2)), which reduces the density of placement attempts approximately 50%. The other fields, including separation, salt, structure weights, frequency, exclusion zones, and placement type, are preserved.
Actual successful structure occurrence depends on biomes, terrain, exclusion zones, and other mods; 50% is an approximation, not a guarantee. Existing generated chunks are unchanged; new/unexplored chunks will use these rules. Different salts and spacing can also shift locations instead of merely thinning them.

Exceptions: Twilight Forest's landmark_grid (fixed-grid progression placement) and Moog's conditional_concentric_rings stronghold placement are NOT changed. See _excluded.txt. Vanilla minecraft namespace is untouched.

If another datapack overrides the same structure_set files, pack priority matters. Make this datapack higher priority to win. Some structures could be generated via configuration, code, or world features, not captured here. Towns and Towers may have a config that alters placement separately.

To remove: take this ZIP out of the datapacks folder, restart. Before experimenting with existing worlds, take a backup.
