UDIM Image

The UDIM image node sets up a UV tile grid similar to UDIM image tile formats (Figure 1). These tiles formats are generated in modeling and texturing applications such as ZBrush^® and Substance Painter.

Figure 1: UDIM image parameters

Use the <UDIM> tag to configure the UDIM textures. For example:

$HIP/testcube_v01_<UDIM>_BaseColor.jpg

UDIM Image Parameters

Power - Controls the image brightness. Lowering the value causes the image to appear darker on the surface.

Color Space - This menu was added to support the ACES color management system and sets the color space of the Image Texture:

Non-Color Data — Use this option for data maps (such as Normal maps). Any map set to this value will use a gamma value of 1.0.
sRGB — For any image using the sRGB color space. This option has a non-linear response curve applied, with a gamma of 2.2, per the definition of sRGB. Note that the gamma value is ignored with this setting as a result.
Linear sRGB + Legacy GammaThe function or attribute used to code or decode luminance for common displays. The computer graphics industry has set a standard gamma setting of 2.2 making it the most common default for 3D modelling and rendering applications. — This is the default option, for backwards compatibility with previous versions of Octane. For true linear images, however, make sure that the gamma value is set to 1.0. Use this option if you wish to manually adjust the gamma value of your image.
ACES2065-1 — The ACES archival color space (widest gamut).
ACEScg — The ACEScg color space, which is a smaller gamut than ACES2065-1; if you have ACES images coming from outside sources, this may be the best option.

Legacy Gamma - Controls the image's luminance and can tune or color-correct the image but can only be used with the Linear sRGB+Legacy Gamma color space.

Invert - Inverts the image's color output values.

Linear sRGB Invert - This option is used to swap the order of gamma correction and image color conversion.

Empty Tile Color - The color used if no image is loaded for a tile.

Filename - The file path name of the image texture.

Grid Size - Determines the size of the image tile grid.

Reload - Forces the texture file to load again.

Image Chosen Layer Name - Indicates the chosen layer name, if the current image has multiple layers.

IESAn IES light is the lighting information representing the real-world lighting values for specific light fixtures. For more information, visit http://www.ies.org/lighting/. Photometry Mode - Can be used to adjust the normalization of data from an IES file.

Channel Format - Determines the proper format of the imported IES profile texture.

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