physicalSize
The real-world dimensions, in meters, of the image.
Declaration
var physicalSize: CGSize { get }Discussion
To accurately recognize the position and orientation of an image in the AR environment, ARKit must know the image’s physical size. You provide this information when creating an AR reference image in your Xcode project’s asset catalog, or when programmatically creating an ARReferenceImage.
When you want to recognize different-sized versions of a reference image, you set automaticImageScaleEstimationEnabled to true, and in this case, ARKit disregards physicalSize.