Changing the color of a model load… | Apple Developer Forums

Changing the color of a model loaded from a USDZ

I have an Entity, loaded from a USDZ file. I want to change the color of one of its modelEntities. I'm isolating that part of the model like this:

let towelModel = towel.children[0].children[0] as? ModelEntity

And that produces the correct ModelEntity:

&#039;Towel_Plane_008&#039; : ModelEntity
  Transform
  SynchronizationComponent
  ModelComponent

I've tried changing its color three different ways:

        var material = SimpleMaterial()
        material.color = .init(tint: .white)
        towelModel.model?.materials[0] = material

        var material = SimpleMaterial()
        material.color = .init(tint: .white)
        towelModel.model?.materials = [material]

        var material = SimpleMaterial()
        material.color = .init(tint: .white)
        var comp: ModelComponent = towelModel.components[ModelComponent.self]!
        comp.materials = [material]
        towelModel.components.set(comp)

None of which work. What is the correct way to do this?