How do I delete individual renderables from the scene using a button using arcore and sceneform?

问题

I'm trying to make a button that will delete a 3d model from the scene after it is selected.

I know that the way to delete 3d objects is by using anchor.detach(). And I can select individual models using node.select(). However, I am not sure how to access the anchor after selecting the node.

FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab);
        fab.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                deleteObject(//I'm not sure how to get the anchor from the selected node//);
            }
        });

private void deleteObject(Anchor anchor){
        anchor.detach();
    }

回答1:

If you want to delete a particular Renderable and you already know the Anchronode, which is what I believe your case is from the question, then the code below will remove the Renderable and Anchornode:

private void removeAnchorNode(AnchorNode nodeToremove) {
        //Remove an anchor node
        if (nodeToremove != null) {
            arFragment.getArSceneView().getScene().removeChild(nodeToremove);
            nodeToremove.getAnchor().detach();
            nodeToremove.setParent(null);
            nodeToremove = null;
            Toast.makeText(LineViewMainActivity.this, "Test Delete - anchorNode removed", Toast.LENGTH_SHORT).show();
        } else {
            Toast.makeText(LineViewMainActivity.this, "Test Delete - markAnchorNode was null", Toast.LENGTH_SHORT).show();
        }
    }

The toast are just to help testing so can be removed or left as you choose.

回答2:

I have similiar question to post's author but I don't know how to get selected AnchorNode which I must put to this function:

private void removeAnchorNode(AnchorNode nodeToremove) {
    //Remove an anchor node
    if (nodeToremove != null) {
        arFragment.getArSceneView().getScene().removeChild(nodeToremove);
        nodeToremove.getAnchor().detach();
        nodeToremove.setParent(null);
        nodeToremove = null;
        Toast.makeText(LineViewMainActivity.this, "Test Delete - anchorNode removed", Toast.LENGTH_SHORT).show();
    } else {
        Toast.makeText(LineViewMainActivity.this, "Test Delete - markAnchorNode was null", Toast.LENGTH_SHORT).show();
    }
}

来源：https://stackoverflow.com/questions/54176491/how-do-i-delete-individual-renderables-from-the-scene-using-a-button-using-arcor

标签

arcore

sceneform