Tangent space sync issues on normal mapped meshes

[ParsleighScumble]

Godot version

master

System information

Windows 10 - Godot master - Vulkan forward+ - Nvidia driver 516.94

Issue description

Related bug to #78339

MikkTSpace expects tangent space to not be normalized per fragment. This causes slight rendering issues with tangent space normal maps. I've submitted a pull request with the fix.

Steps to reproduce

Bake a normal map from a high-poly model to a low-poly model and apply it to a material in Godot. If you look carefully you will see small differences away from vertices. This indicates an issue in the normal map rendering where vertex properties are being interpolated incorrectly. It's more noticeable in the normal buffer view mode.

Minimal reproduction project

godot_tstest.zip