Moving a node along a path in SceneKit

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I have a bezier path, made from QuadCurves, so it's smooth.

Now I would like to move a plane along that path, not necessarily animate it, but just move the node to maybe the centre of the path.

I have tried everything that I could find and I couldn't get the plane moving.

How do I do this? Should I use CGPaths and CAKeyFrameAnimation? If so, how?

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