Updates to the book etc & how to use SceneKit with AR Kit?

📚 Official Books Apple Augmented Reality by Tutorials
1

Hello,

Can anyone say when there might be updates to the book & the chapters that have not been distributed so far?

I am quite keen to see more in depth examples of using SceneKit with ARKit.

I have been seeing some inconsistent results with using SCNActions with AR Kit. I don’t know if it my code or ARKit.

I have been trying to create some action sequences like the following:

    let fadeInAction = SCNAction.fadeIn(duration: 2.0)
    let fadeOutAction = SCNAction.fadeOut(duration: 1.5)

    let action = SCNAction.moveBy(x: 0, y: -0.4, z: 0, duration: 3)
    let rotate = SCNAction.repeatForever(SCNAction.rotate(by: .pi, around: SCNVector3(0, 0, 1), duration: 3))
    let group = SCNAction.group([action, rotate])

    // I saw online that some people where reporting that removeFromParentNode does not work if the node
    // has a material reference
    let blockAction = SCNAction.run { (node) in
        node.geometry?.firstMaterial!.diffuse.contents = nil
    }

    let sequence = SCNAction.sequence([fadeInAction, group, fadeOutAction, blockAction,           SCNAction.removeFromParentNode()])

The sequence as is does not work:

  • there is no fade in or fade out
  • there is no rotation
  • the node does not get removed

If I reduce the sequence to just the move & removeFromParentNode it works.

2

I believe SCNAction.repeatFoever is the problem. It does exactly that it repeats forever, so the group its part of is executed forever.

3

Yes. Thanks for the reply. That is one of the problems. :grinning:

I am currently doing some testing of action sequences using a swift a playground. I will be happy to share a link when it is more complete.

4

I have crested a Swift playground using SCNActions: SceneKit SCNActions Swift Playground