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I was watching a tutorial on making glass, and it included this node, however I wasn't able to find it anywhere, is it an add-on or am I just missing it?

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This is a "Math" node;

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It takes on the name of the operation you are applying to the inputs;

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My most frequent use of it is to multiply input to increase or decrease the strength of Mix Shader nodes.

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Just search 'math' or

  1. Shift + A
  2. Go into Converter
  3. Select Math node
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