Arcade-Maniac/Source/Library/PackageCache/com.unity.render-pipelines.high-definition@11.0.0/Documentation~/snippets/shader-properties/autodesk-interactive/roughness-map.md

**RoughnessMap** The texture that defines the roughness value of the surface. Note that only the Red channel is taken into account.
If you disable **UseRoughnessMap**, HDRP ignores this property.
Note that HDRP only uses the red channel of this texture to determine the roughness value of the material's surface.