Diagonal Leaves

This mod is a utility for terrain mod-makers or map-makers which allows leaves to connect diagonally, preventing decay in scenarios like this without leaves being persistent:



In vanilla (shown with red) the leaves never find any neighbours, so their distance is seven, while with the mod (shown in green) the distance is checked and increments by one for each axis-offset, meaning face connections increase distance by one, edge connections by two and corner connections by three.

Ok, cool but why, though?

Vanilla minecraft can be very annoying when it comes to creating naturally generating custom trees which stray from the vanilla style and more towards an airier, more realistic style.
Since vanilla only checks and propagates distance checks to leaves that are only face-adjacent, edge/vertex-adjacent leaves will be left out, which means they will decay unless set as persistent, but that means leaving the player with the task of manually cleaning them up.
This mod fixes this, although at the expense of making the loop run on all the 26 blocks surrounding the leaves instead of just the 6 face-adjacent ones.

Compatibility

All mods which implement leaves using the LeavesBlock class and logs based on the RotatedPillarBlock class properly tagged as "minecraft:logs" should work out of the box.

NOTE: This mod changes vanilla behaviour significantly. It may cause performance hits, and some of your builds (like leafstone) may break! You have been warned.