The GradientUV Shader uses a 2D gradient, which mixes four colors.

The default 2D gradient, with its four color states: red, green, blue and cyan.

This gradient is then applied to the terrain, using its UV coordinates, as seen in the image below.

A terrain textured using a GradientUV Shader, in its default settings.

The U and V can each be assigned shader inputs.

This makes it possible, using a Terrain Operator Shader, to mix the four colors of the 2D gradient using two terrain properties, like Altitude and Slope (this will be explained in full, further down the page).

First, it is important to properly understand the 2D gradient, how it relates to the terrain’s UVs and how to use the remap controls to make artistic adjustments.

Each Input, U and V, has a remap curve.

A linear curve will map an equal transition from color to color, along the length of the gradient.