Hi! gchiste. At first, please let me say thank you and you are genius ! ! I have just used a default ARWorldTrackingConfiguration. And I have not changed configuration properties you said. So after I read your response, I have tried to change some properties. When I set config.environmentTexturing to .automatic, Model Entity is displayed brightly as same as using RealityKit without WorldTrackingConfigration ! let config = ARWorldTrackingConfiguration() config.environmentTexturing = .automatic Thank you very much from Japan.