How to Zoom .DAE 3D model using ARKit iOS

Question

I have a 3D model with .scn extension. How to zoom it with pinch gesture without virtualobject file from iOS sample Placing Objects application.

Pinch gesture works well with .scn's if its converted from .obj file. But its not working with .dae model.

    func addPinchGestureToSceneView() {

        pinchGesture = UIPinchGestureRecognizer(target: self, action: #selector(scale))
        pinchGesture.scale = 1.0;
        pinchGesture.delegate = self
        self.sceneView.addGestureRecognizer(pinchGesture)
    }
  private func node(at position: CGPoint) -> SCNNode? {
        var hitTestOptions = [SCNHitTestOption: Any]()
        hitTestOptions[SCNHitTestOption.boundingBoxOnly] = true
        return sceneView.hitTest(position, options: hitTestOptions)
            .first(where: { self.getOnlyModelName(name: $0.node.name ?? "") == self.currentmodel.modelname})?
            .node

    }

 @objc func scale(_ gesture: UIPinchGestureRecognizer) {

        if self.currentmodel.isZoomEnabled == false{
            return
        }

        let location = gesture.location(in: sceneView)

        guard let node = node(at: location)else{return}

    //    guard let node = node(at: location) else  { return }

        switch gesture.state {
        case .began:
            originalScale = node.scale
            gesture.scale = CGFloat(node.scale.x)
            print("Begin:: \(originalScale)")
        case .changed:
            guard var originalScale = originalScale else { return }
            if gesture.scale > 2.0{
                return
            }
            originalScale.x = Float(gesture.scale)
            originalScale.y = Float(gesture.scale)
            originalScale.z = Float(gesture.scale)
            node.scale = originalScale
        case .ended:

            guard var originalScale = originalScale else { return }
            if gesture.scale > 2.0{
                return
            }
            originalScale.x = Float(gesture.scale)
            originalScale.y = Float(gesture.scale)
            originalScale.z = Float(gesture.scale)
            node.scale = originalScale
            gesture.scale = CGFloat(node.scale.x)

        default:
            gesture.scale = 1.0
            originalScale = nil
        }

maybe it is in how you load model. does your `node(at:)` return nil? — Alok Subedi, Feb 07 '18 at 16:29

score 0 · Answer 1 · answered Feb 13 '18 at 13:22

0

When it's a dae, you might need to try to grab the parent of the node caught in the hit test. I had a similar issue with dae that got solved by getting the parent of the child, or even sometimes the grandparent of the child.

answered Feb 13 '18 at 13:22

Alan

1,132
7
15

i am also facing same problem and i tried as per you answer parent node in hit test but not work , can you pleas share your code ? – Mayuri R Talaviya Feb 21 '18 at 07:09

How to Zoom .DAE 3D model using ARKit iOS

1 Answers1