[Solved] Value of optional type must be unwrapped to a value of type [duplicate]

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Try this:

if let scene = SCNScene(named: "Models.scnassets/CDMTEST1"){
    sceneView.scene = scene
}

you need to pass a value not a optional since SCNScene(named: “Models.scnassets/CDMTEST1”) is optional since may return nil since it fails.

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solved Value of optional type must be unwrapped to a value of type [duplicate]