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Compositing Material Nodes Reference

Product documentation including reference and guides for Unreal Engine 4

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To make compositing easier, we've added a series of nodes to serve some of the most common compositing operations. Here, we briefly highlight each one, and explain its purpose.

image1.png

The compositing material nodes expect a float4 input, so make sure you're passing in RGBA and not just RGB .

Over

This node layers one image (A) over another (B), using the alpha from input A.

image7.png

This node expects that the input color channels are pre-multiplied with the image's alpha.

In

This node returns the portion of A that is inside the shape of B.

image2.png

Out

This node returns the portion of A that is outside the shape of B.

image3.png

PreMult

This node multiplies the input's RGBA channel by its alpha.

image6.png

UnPreMult

This node divides the input's RGBA channel by its alpha.

image5.png

KeyMix

This node layers two images together using a specified mask.

image4.png

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