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Suppose you have a floating point number, for example the output of a mouse area, and you want to round this number to the lower integer bound. One way to do this is to Modulo/Divide the number by 1.
Input -> Modulo.A Modulo.Div -> RoundedNumber 1 -> Modulo.B
It is often useful to add a StepFilter on the output if you only want to trigger on changing values.
In Core, you can round a number by building a macro with a float input and an integer output. If you want to round to the upper number, you can add 1 first. If you want to round to the upper number for fractional values bigger than 0.5, add 0.5 first.