# UV Texture A MaterialX version of USD UV Texture reader. ## Parameter Types |Input |Type | |----------|-------------| |`Bias` |Color4| |`Fallback`|Color4| |`File` |AssetPath | |`Scale` |Color4| |`St` |Vector2f | |`Wrap S` |String | |`Wrap T` |String | |Output |Type | |-------|-------------| |`RGBA` |Color4| |`RGB` |Color3| |`Red` |Float | |`Green`|Float | |`Blue` |Float | |`Alpha`|Float | ## Parameter descriptions - Bias: The bias the node applies to all components of the texture. The node adds this parameter to the texture after multiplying it by the scale. - Fallback: The value to use if the texture can’t be read from the file. - File: The image file to use for the texture. - Scale: The scale the node applies to all components of the texture. The node multiplies the texture value by this parameter. - St: The 2D coordinate at which the data is read for mapping the texture onto a surface. This node maps from `st` to `uv` image space. The `(0,0)` coordinate in `st` image space maps to the `(0,0)` coordinate in the `uv` space which represents the lower-left–hand corner. The `(1,1)` coordinate in `st` image space maps to the `(1,1)` coordinate in `uv` space which represents the upper-right–hand corner. - Wrap S: The way that the node handles `S` values outside of the range of `0-1`. - Wrap T: The way that the node handles `T` values outside of the range of `0-1`. ## Output descriptions - RGBA: The `Color4` output of the texture that contains a red, green, blue, and alpha component. - RGB: The standard `Color3` output of the texture that contains a red, green, and blue component. - Read: Only the red component of the texture. - Green: Only the green component of the texture. - Blue: Only the blue component of the texture. - Alpha: Only the alpha component of the texture. ## Discussion The `Wrap` parameters for the node tell the node how to handle `S` and `T` values outside of the normal range of `0-1`. These inputs take one of four values to determine their behavior. - black: Texture coordinates outside the normal range return black. - clamp: Texture coordinates outside the normal range clamp to the normal range. Any values greater than `1` are set to `1`, and any values less than `0` are set to `0` - periodic: Texture coordinates outside the normal range are normalized into a range of `0-1`, tiling the image. This is effectively equivalent to applying modulo 1 to the coordinates. --- Copyright © 2026 Apple Inc. All rights reserved. | [Terms of Use](https://www.apple.com/legal/internet-services/terms/site.html) | [Privacy Policy](https://www.apple.com/privacy/privacy-policy)