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# GLKMatrix4MakeFrustum(_:_:_:_:_:_:)

Returns a `4x4` perspective projection matrix.

```
func GLKMatrix4MakeFrustum(_ left: Float, _ right: Float, _ bottom: Float, _ top: Float, _ nearZ: Float, _ farZ: Float) -> GLKMatrix4
```

## Parameters

`left`

The left clipping plane.

`right`

The right clipping plane.

`bottom`

The bottom clipping plane.

`top`

The top clipping plane.

`nearZ`

The near clipping distance. Must be positive.

`farZ`

The far clipping distance.  Must be positive and greater than the near distance.

## Return Value

A projection matrix.

## Discussion

This function creates the same orthographic projection matrix previously provided in OpenGL ES 1.1 by the `glFrustum` function.

---

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