Incorrect UVs for detail textures

[quantumdude836]

Describe the bug
Detail textures are misaligned in Blender, even if they're aligned in Hammer

To Reproduce
Steps to reproduce the behavior:

1. Import any VMF with materials that have detail textures (such as "gm_construct/grass" from Garry's Mod)
2. Switch to material preview
3. See misaligned detail texture

Expected behavior
Detail textures should be aligned as they are in Hammer

Related files
gm_uvdemo.zip

Logs

Read prefs: "C:\Users\Andrew\AppData\Roaming\Blender Foundation\Blender\4.1\config\userpref.blend"
[Plumber] [INFO] opening file system of game `Garry's Mod`...
[Plumber] [WARN] opening filesystem: directory `D:\Steam\steamapps\common\GarrysMod\garrysmod/download` not found
[Plumber] [INFO] file system opened in 0.05 s
[Plumber] [INFO] importing vmf `C:\Users\Andrew\AppData\Local\Temp\plumber-uv\gm_uvdemo.vmf`...
[Plumber] [INFO] vmf imported in 0.19 s

Screenshots
Original map in Hammer:

Imported map in Blender:

Details (please complete the following information):

• OS: Windows 10 22H2
• Blender Version: 4.1
• Addon Version: 1.0.1
• Did you download a release or build the addon yourself: downloaded release
• Related Game: any (Garry's Mod used for example)

Additional context
After skimming through the code I believe the issue is in plumber-core, specifically where UVs are "normalized" by adjusting the UV coords by a whole number. For the base texture, this is fine, but detail textures use scaled coords, which means that UVs used by detail textures are adjusted by a non-whole number.

[lasa01]

Good find, the normalization does break uvs of textures with scaled coords. Not sure what the best way to fix this would be. The UV normalization could be removed, but this would result in quite ugly UVs being imported (uv coordinates in the hundreds, far away from the origin).