Artifacts in some textures when far and off-axis

[TokisanGames]

Terrain3D version

0.8.3

Godot version

4.1.3

System information

Windows 11/64, RTX 3070, Vulkan

Issue description

There's a strange artifact on some textures when viewed in the distance. It looks like textures need to be filtered. This is also present in #234 even after heavy restructuring of the shader.

Wavering on the left and pixelated on the right. This is mostly about the pixels.

Recording.2023-11-03.192038.mp4

The problem is related to the textures read with the albedo_height and normal_rough texture arrays. The samplers that read the textures do have filtering enabled.

uniform sampler2DArray texture_array_albedo : source_color, filter_linear_mipmap_anisotropic, repeat_enable;
uniform sampler2DArray texture_array_normal : hint_normal, filter_linear_mipmap_anisotropic, repeat_enable;

If anisotropic is disabled the artifacts are much worse because the surrounding ground is now blurry, and the pixelated ground strongly contrasts.

Recording.2023-11-12.004906.mp4

All textures are 2k and have mipmaps.

The artifact is in the albedo/height channels. Disabling texture normals doesn't change it. Disabling albedo and just viewing normals/rough it looks fine.

Clamping values on height or albedo doesn't affect it.

Logs

No response

[TokisanGames]

Solution found in #276.