18 lines
1020 B
Markdown
18 lines
1020 B
Markdown
# Thread maps
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The Fabric shaders can use a thread map for the high-frequency details that fabrics exhibit. This is similar to the [detail map](../Mask-Map-And-Detail-Map.md#DetailMap) 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.
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The format of the thread map texture:
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- **Red**: Ambient Occlusion
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- **Green & Alpha**: Normals.
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- **Blue**: Smoothness.
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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:
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1. In the Unity Editor, open a Shader Graph asset’s Shader Editor.
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2. Right-click anywhere in the graph view, and select **Create Node**.
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3. Navigate to **Utility > High Definition Render Pipeline > Fabric > Thread Map Detail** and select. This adds the Thread Map operator into your graph.
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