Overlay
A blend operation that multiplies dark areas and screens light areas.
Overview
2 * F * B if F < 0.5; 1 - (1 - F)(1 - B) if F >= 0.5
Parameter Types
Parameter descriptions
ForegroundThe foreground input. Represented by
Fin the mathmatical equation.BackgroundThe background input. Represented by
Bin the mathmatical equation.MixThe weight of the blend operation. The higher the value of
Mix, the more apparent the effect of the blend operation. The default value is1. Values outside of the range0-1produce an undefined effect outside of the node’s intended function.
Discussion
The Overlay node has one of two effects:
If
F+Bis less than0.5, then the node outputs a value of2*F*B.If
F+Bis greater than or equal to0.5, then it outputs1-(1-F)(1-B), which creates the same visual effect as the Screen node. Visually the node makes dark areas of the blended texture even darker and light areas of the blended texture even lighter.
Below is an example of a simple node graph that uses the Overlay node to blend two images together into a single material:
[Image]
Below are two images and their resulting blended texture applied to a cube:
[Image]