How to force SCNView to render a new frame?

Question

Is there a way to force SCNView to render a new frame on demand if there is no animation inside the scene? If the scene is static SCNView renders exactly once and then only after something changes.

Usually this makes sense, but I am working together with the Vuforia augmented reality framework which requires me to render a new frame every time it processed a new video frame from the camera. I worked around this issue by creating my own UIView with a CAEAGLLayer which renders the SceneKit content using an SCNRenderer. This works great, but I am curious if there is a way to do this with SCNView so I can avoid directly touching OpenGL ES.

Answer 1

Update

As of iOS 11.0 and macOS 10.13 the rendersContinuously property on SCNView is the preferred way to force the view to continuously render frames.

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Previous answer

you can set its playing property to YES

Answer 2

You can increment the sceneTime like so:

sceneView.sceneTime += 1

It will then render a single frame.