server/block: grow trees from saplings

[schphe]

Oak, birch, jungle, spruce, acacia, dark oak, pale oak, cherry, mega spruce, mega jungle (2x2).

Reverse engineered from BDS 1.26.43.1. Field names match the *_tree_feature.json keys in behavior_packs/vanilla_*/features; geometry and RNG order come from the decompiled placers:

SimpleTreeTrunk::place 0xca69060, SimpleTreeCanopy::place 0xca68650, SpruceTreeCanopy::place 0xca69680, RoofedTreeCanopy::place 0xca67c80, AcaciaTreeTrunk::place 0xcab6f10, AcaciaTreeCanopy::place 0xcab6900, MegaTreeTrunk::place 0xca64a10, MegaTreeCanopy::place 0xca64880, MegaPineTreeCanopy::place 0xca64430, CherryTreeTrunk::place 0xca5c0b0, CherryTreeCanopy::place 0xca5b620.

Matching Bedrock:

• Volume tested once up front. After that any blocked position is skipped, so a tree that hits something part way up is left half grown.
• Trunks convert the ground under their whole footprint: podzol for mega spruce, dirt otherwise.
• Mega spruce spreads a podzol base_cluster; jungle hangs vines off trunk and canopy.

Leaf decay, from LeavesBlock::randomTick 0xbdb3fd0 a 4-pass distance relaxation over a radius-4 cube, seeding logs 0, leaves -2, everything else -1:

• findLog searched depth first over a shared visited set. A cell reached by a long path was marked and rejected on the depth limit, blocking the short path through it. Leaves decayed with the trunk intact. Now breadth first.
• Limit was 6 (the Java value); Bedrock runs 4 passes.
• Stripped logs were excluded and Wood ignored; both count.

[schphe]

notice: based on #1238

[THEBOSS9345]

I think you should also add an event handler for when a sapling grows, so the event can be cancelled to prevent the growth or allow you to see where the sapling is going to grow.

[TrippleAWap]

I think you should also add an event handler for when a sapling grows, so the event can be cancelled to prevent the growth or allow you to see where the sapling is going to grow.

I believe this is the wrong approach, if anything we should introduce a handler for RandomTick.