Arcade-Maniac/Source/Library/PackageCache/com.unity.render-pipelines.high-definition@11.0.0/Documentation~/snippets/thread-map.md

Thread maps

The Fabric shaders can use a thread map for the high-frequency details that fabrics exhibit. This is similar to the detail map found in HDRP's Lit shaders. The Thread Map input is channel-packed to optimise memory and is arranged in a way to optimise precision for the normal map. The Fabric Material Sample includes some pre-authored Thread Maps for you.

The format of the thread map texture:

• Red: Ambient Occlusion
• Green & Alpha: Normals.
• Blue: Smoothness.

Under the hood, the fabric shaders apply thread maps using a SubGraph Operator. To learn more about the thread map implementation, or to use it yourself:

1. In the Unity Editor, open a Shader Graph asset’s Shader Editor.
2. Right-click anywhere in the graph view, and select Create Node.
3. Navigate to Utility > High Definition Render Pipeline > Fabric > Thread Map Detail and select. This adds the Thread Map operator into your graph.