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Taking the SceneKit project template in a new Xamarin.Mac Unified project, changing the animation code in GameViewController.cs to:
// retrieve the ship node
var ship = scene.RootNode.FindChildNode("ship", true);
ship.RunAction(SCNAction.RepeatActionForever(SCNAction.Run(handler: (node) => node.Position = new SCNVector3(0, 4, 0))));
// set the scene to the view
MyGameView.Scene = scene;
results in the app not beginning drawing, just hanging.
Changing the above RunAction call to:
ship.RunAction(SCNAction.RepeatAction(SCNAction.Run(handler: (node) => node.Position = new SCNVector3(0, 4, 0)), count: 100000));
results in correct behavior.
Version 5.8 (build 463)
Installation UUID: b9012a08-fce5-4c1a-9287-bba957c5ec7a
Mono 3.12.1 ((detached/7a2a192)
GTK+ 2.24.23 (Raleigh theme)
Package version: 312010001
Apple Developer Tools
Xcode 6.3 (7522.6)
Version: 188.8.131.52 (Indie Edition)
Oops, checking this in Xcode I see this is correct behavior!