Perlin noise creates diagonal structure

[mhinsch]

Describe the bug
PerlinNoise seems to be generating landscapes with a preferred diagonal.

To Reproduce

using Plots
using NeutralLandscapes

heatmap(rand(PerlinNoise(periods=(10,10), octaves=5), 1000, 1000), aspectratio=1)

System

Julia 1.11.5 & NeutralLandscape 0.1.4 on Manjaro Linux

Expected behavior
As far as I know Perlin noise should be isotropic.

[tpoisot]

Reproduced on my end, pretty much all landscapes show a strong diagonal signal. Let me look at the code.

[tpoisot]

Possible fix in #75 - @mhinsch if you run the same code but using the PR, does it make the problem go away?

[mhinsch]

Possible fix in #75 - @mhinsch if you run the same code but using the PR, does it make the problem go away?

Yep, works fine as far as I can tell.