smooth
Translates a value in a (start,end) range into a "back-and-forth" value in a (0,1) range with smooth ease in and ease out.
Return
smooth "back-and-forth" float value equals to 0 at start and end, and 1 at the mid-point between them
Parameters
x
Float clamped from start to end
start
range minimal value
end
range maximal value