---
title: ringRadius
framework: scenekit
role: symbol
role_heading: Instance Property
path: scenekit/scntorus/ringradius
---

# ringRadius

The major radius of the torus, defining a circle in the x- and z-axis dimensions. Animatable.

## Declaration

```swift
var ringRadius: CGFloat { get set }
```

## Discussion

Discussion In the definition of a torus as a surface of revolution, the ring radius is the distance from the center of a circle (defined by the pipeRadius property) to the axis of revolution (the y-axis of the torus’s local coordinate space). Rotating the circle around the axis forms a pipe that follows a ring-shaped path. The default ring radius is 0.5. A ring radius of zero or less creates an empty geometry. You can animate changes to this property’s value. See Animating SceneKit Content.

## See Also

### Adjusting a Torus’ Dimensions

- [pipeRadius](scenekit/scntorus/piperadius.md)