Component:LUT Material

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Component image 

LUT Material component as seen in the Scene Inspector

An LUT or Lookup Table is a way of mapping input values to output values via sampling a 3D Texture. This 3D table of values allows for any arbitrary function to be applied to an input.

Fields

Fields

Name	Type	Description
persistent	Bool	Determines whether or not this item will be saved to the server.
UpdateOrder	Int	Controls the order in which this component is updated.
Enabled	Bool	Controls whether or not this component is enabled.
HighPriorityIntegration	Bool	If true, integrating this asset (e.g. processing procedural assets) gets higher priority than assets with this flag off. An example is user laser procedural meshes.
Rect	Rect
RectClip	Bool
ColorMask	ColorMask	The color channels to affect
StencilComparison	StencilComparison
StencilOperation	StencilOperation
StencilID	Byte
StencilWriteMask	Byte
StencilReadMask	Byte
RenderQueue	Int
_shader	Shader
LUT	Texture3D	The 3D texture to use as a lookup table
SecondaryLUT	Texture3D	A secondary 3D texture to use to lerp between
UseSRGB	Bool
Lerp	Float	Allows blending from the first LUT (0) or the secondary LUT (1)
BlendMode	BlendMode
Sidedness	Sidedness
ZWrite	ZWrite
ZTest	ZTest

Usage

An LUT is commonly constructed via 2D slices of a 3D Texture. These slices represent XY planes of incremental Z coordinates ranging from 0 to 1. This can either be packed into a single 2D image, or imported as multiple 2D images in a folder where each slice is alphabetically organized.

Currently the maximum packed 2D image that the importer detects as a valid LUT is 1024x32. In this orientation there are 32 total cells arranged as 32x32 pixel sub images. A 1:1 mapping LUT which simply maps its inputs directly to the same value on its outputs is shown below which demonstrates the coordinate system:

Linear LUT

• The Red channel increases constantly from 0 to 1 from left to right within each cell and repeats.

Linear LUT Red channel

• The Green channel linearly increases from the top to bottom.

Linear LUT Green channel

• The Blue channel increases step wise within each cell itself, the first cell being all 0, and the last cell is all 1.

Linear LUT Blue channel

The mapping function of an LUT takes an input RGB value and then samples the 3D Texture at that corresponding coordinate to find the output RGB value, using the 3D Texture's Filter Mode and Wrap Mode to resolve how intermediate values work.