I have a RealityKitView, and I want to update my scene when some @State value has changed, but I only want to take this action on the frame that the change happens.
assuming I have something like
@State private var someState = false
in my update I want to take actions like this.
RealityView { content in
// Add the initial RealityKit content
} update: { content in
//I want to do something only when someState has changed.
if(someState != lastValueForSomeState){
//do something to my content that Is expensive and
//shouldn't happen every time state changes
}
lastValueForSomeState = someState
}
I am aware that I can use the .onChange(of:) modifier to do normal ui operations, but I don't know where or if I can declare it in a place where I have access to the RealityKitContent.
I can also imagine ways I could do this with components and systems, but it seems like I should be able to do this without going there. is there some mechanism I'm missing for this?
FallAsleepBear
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I have an immersive space that is rendered using metal. Is there a way that I can position swiftUI views at coordinates relative to positions in my immersive space?
I know that I can display a volume with RealityKit content simultaneously to my metal content. The volume's coordinate system specifically, it's bounds, does not, coincide with my entire metal scene.
One approach I thought of would be to open two views in my immersive space. That way, I could simply add Attachment's to invisible RealityKit Entities in one view at positions where I have content in my metal scene.
unfortunately it seems that, while I can declare an ImmersiveSpace be composed of multiple RealityViews
ImmersiveSpace(){
RealityView { content in
// load first view
} update: { content in
// update
}
}
RealityView{ content in
//load second view
}
} update: { content in
//update
}
}
That results in two coinciding realty kit views in the immersive space.
I can not however do something like this:
ImmersiveSpace(){
CompositorLayer(configuration: ContentStageConfiguration()){ layerRenderer in
//set up my metal renderer and stuff
}
RealityView{ content in
//set up a view where I could use attachments
} update: { content in
}
}