How to remove 3D object/model

[Mato42sk]

How to remove an object (model.glb) , which is added from library and you want to remove it with a click on that object or after button click and after remove u want to insert new for example second object from library.
In Kotlin.

[grassydragon]

• Add the first object when it is selected from the library
• Remove the first object (everything together with the AnchorNode) as described here: https://sceneview.github.io/sceneform-android/remove_node
• Add the second object from the library the same way as you do for the first one

[Mato42sk]

Yes, but I have a problem that I don't know where I get this AnchorNode from. Look at this. This is function where I am adding objects. I don't know how to access this AnchorNode in code and create removeObject function. Can u help me with it?

private fun onTapPlane(hitResult: HitResult, plane: Plane, motionEvent: MotionEvent) {
   if (model == null) {
       Toast.makeText(context, "Select a model", Toast.LENGTH_SHORT).show()
       return
   }

   // Create the Anchor.
   scene.addChild(AnchorNode(hitResult.createAnchor()).apply {
       // Create the transformable model and add it to the anchor.
       addChild(TransformableNode(arFragment.transformationSystem).apply {
           renderable = model
           renderableInstance.animate(true).start()
           // Add the View
           addChild(Node().apply {
               // Define the relative position
               localPosition = Vector3(0.0f, 1f, 0.0f)
               localScale = Vector3(0.7f, 0.7f, 0.7f)
           })
       })
   })
}

[Mato42sk]

thanks a lot, but I still have a problem... I can't launch it. Firstly I had this function

private fun remove{
    scene.removeChild(anchorNode)
    anchorNode.anchor = null
    anchorNode.parent = null
    anchorNode.renderable = null
}

but this shows errors on dots

now I have this, but this shows error too

remove_btn.setOnClickListener {
    if (anchorNode != null)
        anchorNode.anchor = null  // here
}

I don't know how to fix it... and create and call a function which will finally works

[grassydragon]

The are two solutions. The first one is to make the property lateinit like private lateinit var anchorNode: AnchorNode but you should be sure that this property is initialized when you use it in your code. In this case your remove method can remain unchanged. The second one is to assign the value of anchorNode to a local variable so that it can be checked for null and used afterwards (this is a Kotlin feature) or use apply like:

anchorNode?.apply {
    anchor = null
    parent = null
    renderable = null
}

[Mato42sk]

ooh thanks a lot for help. I don't want to annoy, but can I ask one more question? Because now works it finally, but it always only last added item, how can I find out which object is selected and then delete the selected object. I tried something, but didn't work and in documetation didn't found

[grassydragon]

You can get it from TransformationSystem but don't forget that there is a parent AnchorNode:

sceneform-android/ux/src/main/java/com/google/ar/sceneform/ux/BaseTransformableNode.java

Line 53 in 65d6e6e

public boolean isSelected() {

[Mato42sk]

Ommg I appreciate it 💯