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[Zemat]

Ok, this will be difficult to describe so I'll use an image instead.



Notice at the bottom how suddenly the biomes swap at the same Y level. I guess is some rounding or resetting error when polling the temperature values after an arbitrary Y coordinate.

and here are the worldgen parameters used.

It happens consistently with random terrain seeds and seems to be more obvious when there are very few biomes and in medium regions. It has nothing to do with variance since it's high enough and the difference in temperatures could go as far as 200 and yet those biome swapping bands occur.

[Toady One]

Yeah, there are some residual issues with how it handles wind/latitude stuff on maps with the y dimension less than the full 257.  Is there also oddness happening like this on the large maps?

[Zemat]

No, I have seen the bands in all map sizes except large. But haven't done enough tests on them mostly due to the long time they take. I probably haven't tested with those same parameters on large.

Edit: I found out I did the test with those. No problem with large maps apparently.

[Toady One]

Okay, then this is buried off somewhere in all the notes I passed on for this release...  there are quite a few quirks like this.  You'll also see a lot of up/down striping with certain params.