43 lines
2.3 KiB
Markdown
43 lines
2.3 KiB
Markdown
# Inverse Lerp
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Menu Path : **Operator > Math > Arithmetic > Inverse Lerp**
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The **Inverse Lerp** Operator calculates a fraction which represents how far through a value is between two border values. Whereas the [Lerp Operator](Operator-Lerp.md) takes a fraction and outputs a blend between the two values, this Operator takes a blended value and outputs the fraction. For example, if **a** and **b** are the two border values, **t** is the fraction, and **value** is the blend between **a** and **b**:
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* Lerp (**a**, **b**, **t**) = **value**.
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* Inverse Lerp (**a**, **b**, **value**) = **t**.
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This Operator accepts a number of input values of various types. For the list of types this Operator can use, see [Available Types](#available-types). The **X** and **Y** input are always of the same type. The **S** input is either a float or a vector of the same size as **X** and **Y**.
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## Operator properties
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| **Input** | **Type** | **Description** |
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| --------- | --------------------------------------- | -------------------------------------- |
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| **X** | [Configurable](#operator-configuration) | The value to interpolate from. |
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| **Y** | [Configurable](#operator-configuration) | The value to interpolate to. |
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| **S** | [Configurable](#operator-configuration) | A value for the inverse interpolation. |
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| **Output** | **Type** | **Description** |
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| ---------- | --------- | ------------------------------------------------------------ |
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| **Out** | Dependent | The inverse of the linear interpolation of **S** between **X** and **Y**.<br/>The **Type** changes to match the type of **X** and **Y**. |
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## Operator configuration
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To view the Operator’s configuration, click the **cog** icon in the Operator’s header. **X** and **Y** must be of the same type among [Available Types](#available-types). **S** is either a float or the same type as **X** and **Y**. If **S** is a vector type Unity calculates the interpolation value by value.
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If S is between X and Y then the result is between 0 and 1.
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### Available types
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You can use the following types for your **input** ports:
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- **float**
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- **Vector**
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- **Vector2**
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- **Vector3**
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- **Vector4**
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- **Position**
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- **Direction**
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