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1. Put the textures in "SteamLibrary\steamapps\common\assettocorsa\extension\textures\common"
2. Paste the code below in the "ext_config.ini"
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[Material_Carbon]
Materials = (material names here)
HasDetailNormals = 1
Smoothness = 0.85
Reflectance = 0.25 ;0.25
Metalness = 0
CubemapReflectionBlur = 0
UseClearCoat = 1
ClearCoatSmoothness = 0.99
ClearCoatIntensity = 1
DetailTexture = common/carbon_detail1.png
DetailNormalTexture = common/carbon_fiber_nm_1024.png
DetailNormalBlend = 1
DetailScale = 650
Brightness = 0
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Adjust the "DetailScale" and "Brightness" values to yourself
