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  1. Minecraft: Java Edition
  2. MC-237621

Missing biome definitions in some peak grid cells causes unintended ocean placement

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Details

    • Confirmed
    • World generation
    • Normal

    Description

      Background
      In 1.18 the biomes are laid out in a 5d grid of noise values. Usually all grid cells are filed by one biome. However, if a grid cell is not filled, the world generation will pick the biome from the cell with the closest values.

      The bug
      For the combination of peak weirdness, coast continentalness, and erosions 0 to 3 there are no biomes defined. This causes the generation to sometimes pick ocean biomes (that are in the cells with lower continentalness) leading to them generating on land. These are the only grid cells that have no biome definitions.

      Ingame effects
      Here are some areas where oceans generate on land (sometimes very high up in the mountains) because of this bug. All of these positions are on seed 1 . (updated to 21w41a)

      Ocean on land:

      /execute in minecraft:overworld run tp @s -7100.73 103.11 63.60 20.70 49.80
      

      Ocean on peak:

      /execute in minecraft:overworld run tp @s 28441.72 153.99 -2198.79 -28.80 46.50

      Attachments

        1. 2021-09-24_20.04.21.png
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        2. 2021-09-25_00.41.07.png
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        3. 2021-09-25_00.56.08.png
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        4. 2021-09-25_01.20.57.png
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        5. 2021-09-25_01.36.24.png
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        6. 2021-10-13_16.54.24.png
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        7. 2021-10-15_12.23.16.png
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        8. 2021-10-15_12.26.07.png
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        9. 2021-11-12_07.53.23.png
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        10. 2021-11-12_07.54.07.png
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        11. 2021-11-16_10.08.48.png
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        12. 2021-11-16_10.08.48-1.png
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        13. Minecraft 21w40a - Singleplayer 07_10_2021 23_30_24.png
          Minecraft 21w40a - Singleplayer 07_10_2021 23_30_24.png
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        14. Minecraft 21w40a - Singleplayer 07_10_2021 23_30_42.png
          Minecraft 21w40a - Singleplayer 07_10_2021 23_30_42.png
          2.45 MB
        15. Minecraft 21w40a - Singleplayer 07_10_2021 23_31_31.png
          Minecraft 21w40a - Singleplayer 07_10_2021 23_31_31.png
          1.67 MB
        16. oceans & rivers bug.png
          oceans & rivers bug.png
          698 kB

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              hkniberg [Mojang] Henrik Kniberg
              CC_fan jacobsjo
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              Dates

                Created:
                Updated:
                Resolved:
                CHK: