FastNoiseLite.GetImage(normalize: true) morphs on width and height gradual change

[immorom]

Tested versions

Found in: v4.2.2.stable.mono.official [15073afe3]

System information

Godot v4.2.2.stable.mono - Windows 10.0.19045 - GLES3 (Compatibility) - GeForce 210 () - Intel(R) Core(TM) i3-10100F CPU @ 3.60GHz (8 Threads)

Issue description

FastNoiseLite.GetImage(normalize: true) resulting image always shifts and morphs while gradually changing width and height parameters of the function. Firstly noticed on C#, then tested on GDScript – the issue remains.

Setting normalize = false seems to fix the issue, but values are, obviously, not the same as if normalize = true. Drawing the noise by yourself via GetNoise2D() is also problems-free.

(GetNoise2D() with DrawRect() for each point on the left and GetImage(normalize: true) on the right)

Steps to reproduce

For the more noticeable effect you should put 'Project Settings' > 'Rindering' > 'Textures' > 'Default Texture Filter' to 'Nearest'

1. Create FastNoiseLite with NoiseType = FastNoiseLite.NoiseTypeEnum.Simplex
2. Create an image using FastNoiseLite.GetImage2D(normalize: true)
3. Display resulting image in any way (I am using TextureRect with .Texture = ImageTexture.CreateFromImage(<our_result_image>))
4. Gradually change the width and height of GetImage()
5. It moves, it's alive!!

For the MRP: The GDScript is attached to Node2D with Threshold: int and Normalize: bool variables. You can check/uncheck Normalize to compare the results.

Minimal reproduction project (MRP)

FastNoiseLite_Demo.zip

[AThousandShips]

Please upload an MRP to make this easier to test:

• A small Godot project which reproduces the issue, with no unnecessary files included. Be sure to not include the .godot folder in the archive (but keep project.godot).
• Having an MRP is very important for contributors to be able to reproduce the bug in the same way that you are experiencing it. When testing a potential fix for the issue, contributors will use the MRP to validate that the fix is working as intended.
• Drag and drop a ZIP archive to upload it (max 10 MB). Do not select another field until the project is done uploading.
• Note for C# users: If your issue is not C#-specific, please upload a minimal reproduction project written in GDScript. This will make it easier for contributors to reproduce the issue locally as not everyone has a .NET setup available.

Also do you mean normalize?

[immorom]

Also do you mean normalize?

Yes, I do. Corrected title and all occurrences in post.

Uploaded MRP.