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I have a game made of several chessboards set up in an AR environment.

I need at some point to have some of the chessboards to blink.

I'm doing it with a SCNAction executed in the renderer loop of the scene as described below.

func renderer(_ renderer: SCNSceneRenderer, updateAtTime time: TimeInterval)
{
    if Blink { TargetNode.runAction(SCNAction.repeat(SCNAction.sequence([SCNAction.hide(), SCNAction.wait(duration: 1), SCNAction.unhide(), SCNAction.wait(duration: 1)]), count: 10)) }
}

The TargetNode is a node made of hundreds of child nodes (one of the chessboards with all cells as individual nodes and pieces also as individual nodes, all children of TargetNode). Blink is a flag defined somewhere else.

After a few seconds or minutes, I end up with an error :

com.apple.scenekit.scnview-renderer (16): EXC_BAD_ACCESS (code=1, address=0x68)

After having read some literature on this issue, I've came to understand that it is mandatory to have node modification happening within the renderer thread, which is the case here. At least it is called from the renderer thread.

I'm guessing that the way the SCNAction is built can't really secure that it is executing as expected.

Is there a way to do this differently or secure the execution of this SCNAction (preferably) ?

Thx

Jonah Begood
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  • have you observed your memory graph in Xcode? If it goes up and up it's likely you have a memory issue which will can lead to crash. Can you provide more code? It is hard to tell from your updateAtTime example only. – ZAY Apr 01 '21 at 07:28
  • Yes for memory graph, it is stable. No issue there. It is really this SCNAction which triggers the exception. – Jonah Begood Apr 02 '21 at 06:47

1 Answers1

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Sorry, been awhile since I did Scenekit... but I think what is happening...

Blink is on every time you go through the renderer, so it's re-queueing or just queueing up actions which might be why it's binding up. Since you are repeating 10 times, you want to launch it just the one time. If (Blink) { load your actions once and turn Blink off.}

Just a thought

Voltan
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