The camera's focal length, in millimeters.
SDKs
- iOS 11.0+
- macOS 10.13+
- Mac Catalyst 13.0+
- tvOS 11.0+
- watchOS 4.0+
Framework
- Scene
Kit
Declaration
var focalLength: CGFloat { get set }
Discussion
The sensor and focal properties determine the camera's horizontal and vertical viewing angles using terms that model physical camera devices. (Alternatively, you can work with viewing angle directly though the field property.) For example, with the default sensor height of 24 mm and default focal length of 50 mm, the vertical field of view is 60°.
Setting the field property causes SceneKit to automatically recalculate the focal value, and setting the sensor or focal property recalculates field.