Firstborn/Library/PackageCache/com.unity.terrain-tools@4.0.5/Documentation~/toolbox-terrain-layers.md

Terrain Layers

The Terrain Layers section contains a few tools to help manage Terrain Layers on Terrain.

Terrain Palette

A Terrain Palette is a preset asset file that stores a collection of Terrain Layers. This preset file is similar to other Toolbox presets, which you can save or share.

Material Layer Palette

The Material Layer Palette is a reorderable list that contains imported layers. Use the Import From Terrain button to import layers from a selected Terrain. Use the Add (+) and Remove (-) buttons on the bottom right to add or remove a layer. Alternatively, drag a layer row, and move it up or down to change its position in the list.

When using the High Definition Render Pipeline, you cannot use more than eight layers. When using the Universal Render Pipeline or the built-in Terrain system, there's no limit to the number of layers, but increasing the number of splatmaps uses more memory, which might impact performance.

The list order affects which channel and splatmap a layer uses. For example, the image below shows the respective splatmap and channel each layer uses when you assign them to a Terrain.

Position	Splatmap	Channel
Position 1	SplatAlpha0	Red
Position 2	SplatAlpha0	Green
Position 3	SplatAlpha0	Blue
Position 4	SplatAlpha0	Alpha
Position 5	SplatAlpha1	Red

Edit Layers

When you are done configuring the Layer Palette, click Add to Terrain(s) to add the layers to Terrain in the Scene.

Property	Description
Clear Existing Layers	Enable this checkbox to remove any existing layers on the Terrain before adding new layers from the palette.
All Terrains in Scene	Enable this checkbox to apply changes to all Terrain in the Scene. Disable this checkbox to apply changes only to selected Terrain in the Scene.
Add to Terrain(s)	Add palette layers to Terrain.
Remove All Layers	Remove all layers from Terrain.