Help us understand the problem. What is going on with this article?

SCNTechniqueが[SceneKit] Error: can not render without programs, using defaultと言われて適用できないとき。

SCNTechniqueをSCNViewにセットすると、次のようなエラーが出て真っ暗な画面になる事がある。

[SceneKit] Error: can not render without programs, using default

???という感じでめっちゃハマった。
これはSCNViewのRendering APIがOpenGLESなのにMetalのシェーダを適用しようとしていたり、逆にMetalなのにOpenGL ESのシェーダを適用しようとするとなる。

コードでRenderingAPIを指定する場合は初期化時に指定

SCNView(frame: .zero, options: [SCNView.Option.preferredRenderingAPI.rawValue: NSNumber(value: SCNRenderingAPI.openGLES2.rawValue)])

Storyboardで指定する場合はインスペクタから選択する事ができる。

スクリーンショット 2019-01-21 1.43.30.png

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