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# init(geometry:screenSpaceRadius:)

Creates a level of detail with the specified geometry and threshold pixel radius.

```
convenience init(geometry: SCNGeometry?, screenSpaceRadius radius: CGFloat)
```

## Parameters

`geometry`

The geometry to render for this level of detail.

`radius`

The maximum radius (in pixels) of the geometry’s bounding sphere for this level of detail to appear.

## Return Value

A level-of-detail object. You associate levels of detail with a [`SCNGeometry`](/documentation/SceneKit/SCNGeometry) object using its [`levelsOfDetail`](/documentation/SceneKit/SCNGeometry/levelsOfDetail) property.

## Discussion

When rendering a geometry with associated levels of detail, SceneKit calculates the radius in pixels of the circle covered by a geometry’s bounding sphere, then renders the geometry for the [`SCNLevelOfDetail`](/documentation/SceneKit/SCNLevelOfDetail) object with the largest `radius` parameter smaller than that circle.

If you pass `nil` for the geometry parameter, SceneKit renders no geometry for the level of detail. Creating a level-of-detail object with no geometry allows you to skip rendering costs entirely for an object when it would appear very far away or very small.

---

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