# Inverse Lerp Node

## Description

Returns the linear parameter that produces the interpolant specified by input **T** within the range of input **A** to input **B**.

**Inverse Lerp** is the inverse operation of the Lerp Node. It can be used to determine what the input to a Lerp was based on its output.

For example, the value of a **Lerp** between 0 and 2 with a **T** value of 1 is 0.5. Therefore the value of an **Inverse Lerp** between 0 and 2 with a **T** value of 0.5 is 1.

## Ports

Name | Direction | Type | Description |
---|---|---|---|

A | Input | Dynamic Vector | First input value |

B | Input | Dynamic Vector | Second input value |

T | Input | Dynamic Vector | Time value |

Out | Output | Dynamic Vector | Output value |

## Generated Code Example

The following example code represents one possible outcome of this node.

```
void Unity_InverseLerp_float4(float4 A, float4 B, float4 T, out float4 Out)
{
Out = (T - A)/(B - A);
}
```