Why can't I load a ModelEntity from RealityKitContentBundle?

Question

Created Feb ’25

Replies 1

Boosts 0

Participants 2

If I place the .usdz file in the project directory alongside other .swift files, ModelEntity loads it perfectly. However, if I try to load the same file from Reality Composer Pro under RealityKitContent.rkassets, I get the error: resourceNotFound("heart").

Could someone help me with this? Thank you so much

Code:

 //
//  TestttttttApp.swift
//  Testtttttt
//
//  Created by Zhendong Chen on 2/17/25.
//
 
import SwiftUI
 
@main
struct TestttttttApp: App {
 
 
    var body: some Scene {
        WindowGroup {
            ContentView()
        }
        .windowStyle(.volumetric)
    }
}

 //
//  ContentView.swift
//  Testtttttt
//
//  Created by Zhendong Chen on 2/17/25.
//
 
import SwiftUI
import RealityKit
import RealityKitContent
 
struct ContentView: View {
 
    @State private var enlarge = false
 
    var body: some View {
        RealityView { content in
            
            do {
                // MARK: Work
                let scene = try await ModelEntity(named: "heart")
                content.add(scene)
                    
                
                // MARK: Doesn't work
//                let scene = try await ModelEntity(named: "heart", in: realityKitContentBundle)
//                content.add(scene)
                
            } catch {
                print(error)
            }
        }
    }
}
 
#Preview(windowStyle: .volumetric) {
    ContentView()
}

Screenshot 2025-02-17 at 10.07.57 PM.png

Screenshot 2025-02-17 at 10.08.42 PM.png

Boost

Answer 1

Vision Pro Engineer OP

Apple

Feb ’25

Hello @WeAreAllSatoshi

My first recommendation would be try using Entity(named: in: ) to see if you can load your asset that way. There are some differences in how ModelEntity(named: in: ) loads model entities from RCP packages and from the main bundle that may be causing the error you're seeing here.  

A ModelEntity is, essentially, an Entity with a ModelComponent, so you should be able to find your ModelComponent on the Entity you load with Entity(named: in: ) and access any necessary data that way (even if the root entity is not technically a ModelEntity - the ModelComponent and mesh data should still exist somewhere in the loaded Entity's hierarchy). Can you elaborate a bit more on what you are trying to do with the entity you're loading? I am happy to give suggestions based on your specific context.

  Thank you for your question!

0

	//
	// TestttttttApp.swift
	// Testtttttt
	//
	// Created by Zhendong Chen on 2/17/25.
	//

	import SwiftUI

	@main
	struct TestttttttApp: App {


	var body: some Scene {
	WindowGroup {
	ContentView()
	}
	.windowStyle(.volumetric)
	}
	}

	//
	// ContentView.swift
	// Testtttttt
	//
	// Created by Zhendong Chen on 2/17/25.
	//

	import SwiftUI
	import RealityKit
	import RealityKitContent

	struct ContentView: View {

	@State private var enlarge = false

	var body: some View {
	RealityView { content in

	do {
	// MARK: Work
	let scene = try await ModelEntity(named: "heart")
	content.add(scene)


	// MARK: Doesn't work
	// let scene = try await ModelEntity(named: "heart", in: realityKitContentBundle)
	// content.add(scene)

	} catch {
	print(error)
	}
	}
	}
	}

	#Preview(windowStyle: .volumetric) {
	ContentView()
	}