I have exactly the same question. If I use Model3D it will be rendered "On" the window, but if I use RealityView it is rendered between camera and window. If I want to integrate my elements into the view, it is not possible. Moving Objects Positions is also not possible. So how am I supposed to render 3D content to a swiftUI Window but still have access to change materials (e.g. to show materials in different colors) ?