<!--
{
  "availability" : [
    "iOS: 8.0.0 - 26.0.0",
    "iPadOS: 8.0.0 - 26.0.0",
    "macCatalyst: 13.1.0 - 26.0.0",
    "macOS: 10.8.0 - 26.0.0",
    "tvOS: 9.0.0 - 26.0.0",
    "visionOS: 1.0.0 - 26.0.0",
    "watchOS: 3.0.0 - 26.0.0"
  ],
  "documentType" : "symbol",
  "framework" : "SceneKit",
  "identifier" : "/documentation/SceneKit/SCNLevelOfDetail/screenSpaceRadius",
  "metadataVersion" : "0.1.0",
  "role" : "Instance Property",
  "symbol" : {
    "kind" : "Instance Property",
    "modules" : [
      "SceneKit"
    ],
    "preciseIdentifier" : "c:objc(cs)SCNLevelOfDetail(py)screenSpaceRadius"
  },
  "title" : "screenSpaceRadius"
}
-->

# screenSpaceRadius

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

```
var screenSpaceRadius: CGFloat { get }
```

## 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 smallest `radius` parameter larger than that circle.

---

Copyright &copy; 2026 Apple Inc. All rights reserved. | [Terms of Use](https://www.apple.com/legal/internet-services/terms/site.html) | [Privacy Policy](https://www.apple.com/privacy/privacy-policy)