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  1. Minecraft: Java Edition
  2. MC-118980

2 × 2 trees required free area is larger in negative directions

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    • Confirmed
    • (Unassigned)

    Description

      The bug

      The required free area for 2 × 2 trees to grow is larger in the negative directions.

      How to reproduce

      1. Build a 2 × 2 area of dirt
      2. Build a stone tower one block away in the positive x- or z-direction, see Setup.png
      3. Place jungle saplings on the dirt and increase the randomTickSpeed gamerule value
        /gamerule randomTickSpeed 1000
        

        → The tree grows

      4. Repeat steps 1 to 3 but this time build the stone tower in the negative x- or z-direction, see Setup.png
        → The tree does not grow

      Note: Some blocks like logs and leaves don't obstruct tree growth. Saplings however do.

      Code analysis

      Based on 1.12 decompiled using MCP 9.40 PRE 1

      2 × 2 trees generate beginning at the sapling in the negative x- and z-direction, however the free area checks (jungle and spruce: net.minecraft.world.gen.feature.WorldGenHugeTrees.isSpaceAt(World, BlockPos, int), dark oak: net.minecraft.world.gen.feature.WorldGenCanopyTree.placeTreeOfHeight(World, BlockPos, int)) offset the sapling position equally in negative and positive directions instead of offsetting it further in the positive directions.

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              Unassigned Unassigned
              marcono1234 [Mod] Marcono1234
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              Dates

                Created:
                Updated:
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