Ambience

Ambience (net.satisfy.foundation.ambient)

Fireflies around lanterns

Every block in the tag foundation:attracts_fireflies gets fireflies at night – outdoors, no rain, and only while lit (if the block has a lit property, or luminance for a LampBlock).

Turn it on (client init). Pass your config switch – Foundation has none:

FireflyAmbience.init(MyConfig::fireflies);

Several mods may call init; fireflies show when all passed switches are on.

Add your blocks – data/foundation/tags/block/attracts_fireflies.json in your mod:

{
  "replace": false,
  "values": ["mymod:paper_lantern"]
}

Vanilla lanterns and #c:lanterns are already in.

Fireflies from your own block

@Override
public void animateTick(BlockState state, Level level, BlockPos pos, RandomSource random) {
    if (random.nextInt(12) == 0 && MyConfig.fireflies() && Fireflies.isActive(level, pos)) {
        Fireflies.spawn(level, pos, random, 0.5, 0.6); // spread, height above the block
    }
}