The Multiply expression takes two inputs, multiplies them together, and outputs the result. Similar to Photoshop's multiply layer blend. Multiplication happens per channel, meaning that the R channel of the first is multiplied by the R channel of the second; the G chanWnel of the first is multiplied by the G channel of the second, and so on. Both inputs must have the same number of values unless one of the values is a single float value.
Takes in the first value(s) to multiply. Used only if the A input is unused.
Takes in the second value(s) to multiply. Used only if the B input is unused.
Takes in the first value(s) to multiply.
Takes in the second value(s) to multiply.
Do not forget that materials in UE4 are not limited to [0,1]. If colors/values are greater than 1, Multiply will actually brighten colors.
Examples: Multiply of 0.4 and 0.5 is 0.2; Multiply of (0.2,-0.4,0.6) and (0.0,2.0,1.0) is (0.0,-0.8,0.6); Multiply of (0.2,-0.4,0.6) and 0.5 is (0.1,-0.2,0.3).
Example Usage: Multiply is often used to brighten or darken colors/textures.