Burn

A blend operation that darkens the foreground layer using the background.

Overview

1 - (1 - B) / F

Parameter Types

Parameter descriptions

Foreground: The foreground input. Represented by F in the mathmatical equation.
Background: The background input. Represented by B in the mathmatical equation.
Mix: The weight of the blend effect. The higher the Mix, the greater the intensity of the blend operation, and the more the effect is visually apparent. The default value is 1. Values outside of the range 0-1 produce an undefined effect outside of the node’s intended function.

Discussion

The Burn node darkens each area in the background based on the darkness of the corresponding area in the foreground, represented by the equation 1 - (1 - B) / F. Below is an example of a node graph that uses the Burn node to darken a brick texture:

[Image]

Use a Noise 2D node to generate Perlin noise, and use the output of that texture as the foreground in the Burn node. This process darkens the background brick texture according to the procedural pattern. Below, the resulting texture applies to a cube: