In mathematics, linear interpolation is a method of curve fitting using linear polynomials to construct new data points within the range of a discrete set of known data points. Lerp or LERP may refer to: Lerp (biology), a structure produced by larvae of psyllid insects as a protective cover. What is lerp()? What is linear interpolation? How can you use this function to create an "easing. A lerp is similar to an otaku. Lerp function takes 3 float parameters: one representing the value to interpolate from; another representing the value to interpolate to and a final.