ShaderGraphMaterial on entity

Question

Kito7777 OP

Created 1d

Replies 2

Boosts 0

Participants 2

Hi

I try to make a 360 stereo viewer, and I have made a ShaderGraphMaterial on Reality Composer Pro.

Im trying to use that material on a inverted sphere whitch is generated in Swift.

When I try to attach the material I get this error "Type of expression is ambiguous without a type annotation"

Here is the code (sorry im noob =) ):

import SwiftUI import RealityKit import RealityKitContent import PhotosUI

struct ImmersiveView: View {

@Environment(AppModel.self) var appModel

var body: some View {
    RealityView { content in
        // Add the initial RealityKit content
        guard let skyBoxEntity = await createSkybox() else {
            return
        }
        
        content.add(skyBoxEntity)
    }
}

}

private func createSkybox () async -> Entity? {

    var matX = try? await ShaderGraphMaterial(named: 
                                             "/Root/Mat_Stereo360",         
                                              from: "360Stereo.usda",
                                              in: realityKitContentBundle)
   
   let sphere = await MeshResource.generateSphere(radius:1000)
   let entity = await Entity()

   entity.components.set(ModelComponent(mesh: sphere, materials: 
                                                                          [matX])). //ERROR HERE: 
                      Type of expression is ambiguous without a type annotation                        

   //entity.scale *= .init(x:-1, y:1, z:1)

   return entity
}

I hope someone can help me =)

Best regards, Kim

Boost

Answer 1

Vision Pro Engineer OP

Apple

8h

Hi @Kito7777

Thanks for the question!

Try initializing matX like this:

guard let matX = try? await ShaderGraphMaterial(named:
                                                 "/Root/Mat_Stereo360",
                                                        from: "360Stereo.usda",
                                                        in: realityKitContentBundle) else {return nil}

The error occurs because the compiler doesn't know if matX is nil or an instance of ShaderGraphMaterial. One way to remedy this is to unwrap matX.

Also consider changing:

let sphere = await MeshResource.generateSphere(radius:1000)
let entity = await Entity()

to

let sphere = MeshResource.generateSphere(radius:1000)
let entity = Entity()

since neither of the operations are asynchronous.

0

Answer 2

Kito7777 OP

7h

Nice! Thanks a lot 👍😅👍

0