(make: @escaping @MainActor @Sendable (inout RealityViewCameraContent) async -> Void, update: (@MainActor (inout RealityViewCameraContent) -> Void)? = nil, @ViewBuilder placeholder: () -> P) where Content == RealityViewCameraContent.Body
, P : View
```
## Parameters
`make`
An asynchronous closure that configures the
initial content of the new `RealityView`.
This closure is asynchronous to keep your app’s UI responsive while
you load content to populate this view.
`update`
An optional closure that updates the `RealityView`
instance’s content as the view’s state changes.
`placeholder`
A temporary view that the [`RealityView`](/documentation/RealityKit/RealityView) displays until
your closure for the `make` parameter completes.
For example, you can display a loading indicator with a