# rsqrt

> Returns the reciprocal square root of a float value.

## Definition

* **Type:** Method
* **Namespace:** [Unity.Mathematics](/engine/6000.7/script-reference/unity/mathematics.md)
* **Assembly:** UnityEngine.MathematicsModule

## rsqrt(float)

Returns the reciprocal square root of a float value.

```csharp
public static float rsqrt(float x)
```

### Parameters

**** (\[float]\(https\://learn.microsoft.com/dotnet/api/system.single)): Value to use when computing reciprocal square root.

### Returns

| Type                                                          | Description                 |
| ------------------------------------------------------------- | --------------------------- |
| [float](https://learn.microsoft.com/dotnet/api/system.single) | The reciprocal square root. |

## rsqrt(float2)

Returns the componentwise reciprocal square root of a float2 vector.

```csharp
public static float2 rsqrt(float2 x)
```

### Parameters

**** (\[float2]\(/engine/6000.7/script-reference/unity/mathematics/float2)): Value to use when computing reciprocal square root.

### Returns

| Type                                                                  | Description                               |
| --------------------------------------------------------------------- | ----------------------------------------- |
| [float2](/engine/6000.7/script-reference/unity/mathematics/float2.md) | The componentwise reciprocal square root. |

## rsqrt(float3)

Returns the componentwise reciprocal square root of a float3 vector.

```csharp
public static float3 rsqrt(float3 x)
```

### Parameters

**** (\[float3]\(/engine/6000.7/script-reference/unity/mathematics/float3)): Value to use when computing reciprocal square root.

### Returns

| Type                                                                  | Description                               |
| --------------------------------------------------------------------- | ----------------------------------------- |
| [float3](/engine/6000.7/script-reference/unity/mathematics/float3.md) | The componentwise reciprocal square root. |

## rsqrt(float4)

Returns the componentwise reciprocal square root of a float4 vector

```csharp
public static float4 rsqrt(float4 x)
```

### Parameters

**** (\[float4]\(/engine/6000.7/script-reference/unity/mathematics/float4)): Value to use when computing reciprocal square root.

### Returns

| Type                                                                  | Description                               |
| --------------------------------------------------------------------- | ----------------------------------------- |
| [float4](/engine/6000.7/script-reference/unity/mathematics/float4.md) | The componentwise reciprocal square root. |

## rsqrt(double)

Returns the reciprocal square root of a double value.

```csharp
public static double rsqrt(double x)
```

### Parameters

**** (\[double]\(https\://learn.microsoft.com/dotnet/api/system.double)): Value to use when computing reciprocal square root.

### Returns

| Type                                                           | Description                 |
| -------------------------------------------------------------- | --------------------------- |
| [double](https://learn.microsoft.com/dotnet/api/system.double) | The reciprocal square root. |

## rsqrt(double2)

Returns the componentwise reciprocal square root of a double2 vector.

```csharp
public static double2 rsqrt(double2 x)
```

### Parameters

**** (\[double2]\(/engine/6000.7/script-reference/unity/mathematics/double2)): Value to use when computing reciprocal square root.

### Returns

| Type                                                                    | Description                               |
| ----------------------------------------------------------------------- | ----------------------------------------- |
| [double2](/engine/6000.7/script-reference/unity/mathematics/double2.md) | The componentwise reciprocal square root. |

## rsqrt(double3)

Returns the componentwise reciprocal square root of a double3 vector.

```csharp
public static double3 rsqrt(double3 x)
```

### Parameters

**** (\[double3]\(/engine/6000.7/script-reference/unity/mathematics/double3)): Value to use when computing reciprocal square root.

### Returns

| Type                                                                    | Description                               |
| ----------------------------------------------------------------------- | ----------------------------------------- |
| [double3](/engine/6000.7/script-reference/unity/mathematics/double3.md) | The componentwise reciprocal square root. |

## rsqrt(double4)

Returns the componentwise reciprocal square root of a double4 vector.

```csharp
public static double4 rsqrt(double4 x)
```

### Parameters

**** (\[double4]\(/engine/6000.7/script-reference/unity/mathematics/double4)): Value to use when computing reciprocal square root.

### Returns

| Type                                                                    | Description                               |
| ----------------------------------------------------------------------- | ----------------------------------------- |
| [double4](/engine/6000.7/script-reference/unity/mathematics/double4.md) | The componentwise reciprocal square root. |