ARWorldTrackingConfiguration.EnvironmentTexturing.manual
The framework generates environment textures only for probe anchors you explicitly add to the session.
Declaration
case manualDiscussion
When you use this environmentTexturing option, you must manually choose when and where to generate environment map textures:
Create an AREnvironmentProbeAnchor object with a
transformindicating its position in the scene.Add the probe anchor to the session with the add(anchor:) method.
If you display AR content using ARSCNView, SceneKit automatically retrieves texture maps from probe anchors and uses them to light the scene. Otherwise, use a delegate method such as session(_:didUpdate:) to find out when the probe anchor’s texture has been updated and access the environmentTexture property.