ios - Placement of 3D object not working the SECOND time my button is pressed -

i programmatically added button arscnview , added function that's called whenever it's tapped. function creates , place 3d object. button works first time it's pressed, second time onwards not place object.

here's code:

private var button = uibutton()

override func viewdidload() {     super.viewdidload()      // set view's delegate     sceneview.delegate = self      button.settitle("body", for: button.state)     button.frame = cgrect(x: 100, y: 25, width: 100, height: 25)     button.addtarget(self, action: #selector(buttonaction), for: .touchupinside)     view.addsubview(button) }  @objc func buttonaction(sender: uibutton!) {         self.createplanenode() }  func createplanenode() {     //create new scene our 3d object in     print("hi")     //this prints everytime button pressed, checked.       let object = scnscene(named: "art.scnassets/manbody.obj")     let node = scnnode()     let nodearray = object!.rootnode.childnodes      childnode in nodearray {         node.addchildnode(childnode)     }      guard let currentframe = sceneview.session.currentframe else {         return     }     var translation = matrix_identity_float4x4     translation.columns.3.z = -0.1 // translate 10 cm in front of camera     node.simdtransform = simd_mul(currentframe.camera.transform, translation)      // scnplanes vertically oriented in local coordinate space.     // rotate match horizontal orientation of arplaneanchor.      node.transform = scnmatrix4makerotation(-float.pi / 2, 1, 0, 0)     sceneview.scene.rootnode.addchildnode(node) } 

it work second time, check poly count. ;)

however, cannot see result of subsequent calls keep putting object @ same place.

you set new position here correctly:

node.simdtransform = simd_mul(currentframe.camera.transform, translation) 

but overwrite transform on next line:

node.transform = scnmatrix4makerotation(-float.pi / 2, 1, 0, 0) 

note node.simdtransform , node.transform different "views" of same thing.

change node's pivot apply rotation instead, or multiply transform instead of overwriting it.