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The V-Ray UVWGenChannel node allows you to use Channel mapping within the Mat Network.

UI path: ||mat Network|| > V-Ray > Texture: Mappings > V-Ray UV Channel Index

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.