# Solved: how to lerp in

Lerping, or linear interpolating, is a technique used in math and programming, including the C# language, that allows you to find a value between two numbers. It’s used extensively in game development to smooth movements, colors transitions, or any variable interpolation over time. But it’s not limited to just game dev and can offer wide-ranging benefits in different fields.

With lerp, we deal with two principal values: the start and the end points. The third significant value is the ‘t’ parameter, typically a value that goes from 0 to 1. If ‘t’ equals 0, lerp returns the start point. If ‘t’ equals 1, lerp returns the end point.

## The Lerp Function in C#

The solution to lerping in C# is quite simple and straightforward. The function that you are likely to use in C# would look like this:

public static float Lerp(float firstValue, float secondValue, float by)
{
return firstValue * (1 – by) + secondValue * by;
}

In the code above, we define a static, public method that accepts three float parameters – the start point (firstValue), the end point (secondValue), and the interpolation point (by). The function returns a float that represents the interpolated value between the firstValue and secondValue.

## Step by Step Explanation of Linear Interpolation in C#

The lerp function linearly interpolates between two points based on a t parameter. Here’s a step-by-step breakdown of how the calculation works:

• Subtract the ‘by’ parameter from 1. Multiply the resulting number with the firstValue. This forms the first part of our final answer
• Multiply the secondValue with the ‘by’. This forms the second part of our result.
• Add the two parts together. The result is a value that is proportionally between the two original input numbers.

## Applications of Lerp

There are numerous applications of lerp in game development. It can be used to move an object from one point to another, change an object’s size, or even manipulate color and alpha entities. If we look beyond game development, it has many applications in animation, machine learning models, and graphical computations.

In short, understanding how lerp functions work can be an invaluable tool in your programming toolbox, regardless of your specific area of development. Though it is a simple concept, its versatility and wide range of applications make it a key concept for all aspiring and established developers alike.

## Working with C# Libraries

The .NET Framework and the new .NET Core provide a wealth of libraries that can streamline the use of linear interpolation and other mathematical functions in your C# code. The System.Math library, for instance, provides numerous methods for complex mathematical calculations.

Remember that understanding and leveraging these libraries is important, as it can significantly decrease development time and increase the efficiency of your code. Always keep exploring the .NET landscape to stay updated and leverage the power of C# to its full potential. For making your interpolation function, you won’t have to rely on a library, but knowing they exist can give you a shortcut for more complex functions.

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