Scenkit Eulerangles Strange Values During Rotation

ARKit cannot rotate a SCNNode correctly on a vertical plane

I tried SCNNode eulerAngles and SCNNode rotation and I have no luck...

I guess that is because I invoked SCNNode.transform() when I add the painting. When later I modify SCNNode.eulerAngles and invoke SCNNode.rotation(), they may have influence on the first transform.

I finally get it working using SCNMatrix4Rotate, not using eulerAngles and rotation.

  func addPainting(_ hitResult: ARHitTestResult, _ grid: Grid) {
    ...
    let newPaintingNode = SCNNode(geometry: planeGeometry)
    newPaintingNode.transform = SCNMatrix4(hitResult.anchor!.transform)
    newPaintingNode.transform = SCNMatrix4Rotate(newPaintingNode.transform, -Float.pi / 2.0, 1.0, 0.0, 0.0)
    newPaintingNode.position = SCNVector3(hitResult.worldTransform.columns.3.x, hitResult.worldTransform.columns.3.y, hitResult.worldTransform.columns.3.z)
    self.paintingNode = newPaintingNode
    ...
  }
...
  @objc func rotateNode(_ gesture: UIRotationGestureRecognizer){

    if let _ = self.paintingNode {

      // Get The Current Rotation From The Gesture
      let rotation = Float(gesture.rotation)

      if gesture.state == .began {
        self.rotationZ = rotation
      }

      if gesture.state == .changed {
        let diff = rotation - self.rotationZ
        self.paintingNode?.transform = SCNMatrix4Rotate(self.paintingNode!.transform, diff, 0.0, 0.0, 1.0)
        self.rotationZ = rotation
      }

    }

  }

And the above code works on both vertical and horizontal plane.

Rotate a node using pan gesture in SceneKit iOS

I think you might be overcomplicating what you need to do here.

In my example, I have created an SCNNode with an SCNBox Geometry and set it's Euler Angles as per your example: (x: -90, y: 0, z: 0).

The 1st thing you need to do, is create a variable to store the rotationAngle around the YAxis:

var currentAngleY: Float = 0.0

Then try this function in order to rotate your node around the YAxis (which works fine by the way):

 /// Rotates An Object On It's YAxis
 ///
 /// - Parameter gesture: UIPanGestureRecognizer
 @objc func rotateObject(_ gesture: UIPanGestureRecognizer) {

        guard let nodeToRotate = currentNode else { return }

        let translation = gesture.translation(in: gesture.view!)
        var newAngleY = (Float)(translation.x)*(Float)(Double.pi)/180.0
        newAngleY += currentAngleY

        nodeToRotate.eulerAngles.y = newAngleY

        if(gesture.state == .ended) { currentAngleY = newAngleY }

        print(nodeToRotate.eulerAngles)
}

Hope it helps...

SceneKit. How to rotate SCNNode around its axis

Seems you was really close, you had to swap parameters in GLKQuaternionMultiply call. I used solution in https://stackoverflow.com/a/39813058/4124265 to achieve rotation only by Z axis:

    let orientation = modelNode.orientation
    var glQuaternion = GLKQuaternionMake(orientation.x, orientation.y, orientation.z, orientation.w)

    // Rotate around Z axis
    let multiplier = GLKQuaternionMakeWithAngleAndAxis(0.5, 0, 0, 1)
    glQuaternion = GLKQuaternionMultiply(glQuaternion, multiplier)

    modelNode.orientation = SCNQuaternion(x: glQuaternion.x, y: glQuaternion.y, z: glQuaternion.z, w: glQuaternion.w)

To rotate arround Y:

    // Rotate around Y axis
    let multiplier = GLKQuaternionMakeWithAngleAndAxis(0.5, 0, 1, 0)
    glQuaternion = GLKQuaternionMultiply(glQuaternion, multiplier)

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