RandomLeaf

Vanilla leaves in worlds generated with the mod get one of eight Y-axis rotations, so trees show varied leaf texture direction instead of a uniform look. The mod covers the oak, spruce, birch, jungle, acacia, dark oak, mangrove, cherry, azalea and flowering azalea leaf types. It injects an extra variant property into the leaves block through a Mixin, and a custom blockstate configuration uses it.

Three situations trigger the flip: leaves created during world generation, leaves that appear as saplings grow, and leaves a player places. During world generation a SplitMix64 hash built from the world seed and block coordinates decides the rotation, so the same location always produces the same flip. Sapling growth and player placement use true random numbers, so repeated events can give different results. Two Mixin layers route generated leaves through the deterministic path and separate them from the other scenarios without extra flags.

RandomLeaf is published for Fabric only, with a single game version, 1.21.1. Servers that run it need every player to install it too. The code is released under the MIT License, and the mod is not open source.