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title: "V-Ray UV Channel Index"
canonical: "https://documentation.chaos.com/space/VRAYHOUDINI/113280086/V-Ray%20UV%20Channel%20Index"
format: markdown
---
This page provides information on the V-Ray UVWGenChannel node. Overview The V-Ray UVWGenChannel node allows you to use Channel mapping within the Mat Network. Parameters Channel Index  – Specifies the UVW channel index. Wrap U / V / W  – Specifies the type of wrapping: No Wrapping Wrap Mirror Tile Crop U / V / W  – When enabled, cropping occurs in the specified direction. Coverage  – Specifies the UVW coverage. Wrap Mode  – Specifies one of the following wrapping modes: On 0.5 boundary On integer boundary UV Derivatives Scale  – Specifies an additional scale factor for the texture derivatives. Use Double Sided Mode  – When enabled, V-Ray uses the  Uvw Channel  for front-side contexts and  Uvw Channel + 1  for back-side contexts. This is primarily for V-Ray for SketchUp.