[MC-111378] Math error (random generation of zero) causing map gen to fail - Jira

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Type: Bug
Status: Resolved
Resolution: Won't Fix
Affects Version/s: Minecraft 1.11, Minecraft 16w50a, Minecraft 1.11.2, Minecraft 17w06a, Minecraft 1.12 Pre-Release 5, Minecraft 1.12, Minecraft 1.12.2, Minecraft 17w50a, Minecraft 18w08a, Minecraft 18w09a, Minecraft 18w16a, Minecraft 1.13.1, 1.14.4, 19w41a, 19w46a, 1.15 Pre-release 3, 1.15.2, 20w07a, 20w14a, 20w17a, 20w21a, 1.16 Release Candidate 1, 1.16, 20w27a, 20w29a, 1.16.2
Fix Version/s: None
Labels:

There is a math error in MapGenBase.java (MCP Name) in the generate function.

When the per chunk seeds are being generated there is a very small chance that either the x or z can be equal to 0.

When doing the per chunk math it multiplies by 0 causing every chunk in the axis to be the same.

The following seeds are affected:

107038380838084
164311266871034

There needs to be a check so that if those values are 0, then it should be set to 1.

I have recorded a video demonstrating this, including a fix:
https://www.youtube.com/watch?v=D5c-DZA2R2U&feature=youtu.be

is duplicated by

MC-126020 Duplicating Ravines Side by Side

MC-190642 Underground structures generate repeating along one coordinate axis on certain seeds

MC-193081 seed that repeat nether ravins and ocean ravins

MC-200728 https://m.youtube.com/watch?v=UtNXUMrSIxQ

MC-203292 weird seed

relates to

MCPE-95011 Certain seeds cause features to repeat

(1 relates to)