# Linear Interpolation
You can find this sample in the tutorial project: **Menu** → **Linear Iterpolation** 

## Explanation
This C# Beginner tutorial covers linear interpolation which is often shortened to 'Lerp'.

Sometimes you want to gradually change a value from a start value to a target value. This process is called linear interpolation.

Stride exposes several Lerp functions for various types. Among them are `Vector2`, `Vector3` and `Vector4`.

![Linear interpolation](media/lerp.webp)


> [!Video https://www.youtube.com/embed/jBXGvLBwXqI]

## Code

The example consists of a simple timer that resets after a couple seconds. When the timer starts, a start position and a randomly generated target position are stored. A box will move between these two positions.

Every frame a 'Lerp value' is calculated. The lerp value is used to determined what the current position of a moving box should be. Once the timer is done, the current position will become the start position and a new target position is again randomly generated.

[!code-csharp[Lerp](../../../../stride/samples/Tutorials/CSharpBeginner/CSharpBeginner/CSharpBeginner.Game/Code/LerpDemo.cs)]