ARCORE:通过单击特定可渲染对象来删除该可渲染对象 [英] ARCORE: remove a specific renderable by clicking on this renderable

问题描述

我正在使用ARCore的Sceneform开发一个项目.我基于ARCore提供的HelloSceneform示例进行开发. 我想做的是按点击添加可渲染对象，然后在单击屏幕上的特定可渲染对象时将其删除. 我已经尝试过如下方法AnchorNode.setOnTapListener，但是它没有用(无响应):

I'm working on a project using Sceneform from ARCore. I develop it base on HelloSceneform example provided by ARCore. What I wanna do is adding a renderable object by a hit and then delete it when I click on the specific renderable on the screen. I've tried method AnchorNode.setOnTapListener as following, but it didn't work(no response):

anchorNode.setOnTapListener(new Node.OnTapListener() {
                      @Override
                      public void onTap(HitTestResult hitTestResult, MotionEvent motionEvent) {
                          if(anchorNode.getAnchor()!=null){
                              arFragment.getArSceneView().getScene().removeChild(anchorNode);
                              anchorNode.getAnchor().detach();
                              anchorNode.setParent(null);
                          }
                      }
                  });

我还尝试了以下方法，该方法会导致意外关闭:

I also tried the following method, which causes unexpected close:

      Scene scene = arFragment.getArSceneView().getScene();
      scene.addOnPeekTouchListener(new Scene.OnPeekTouchListener() {
          @Override
          public void onPeekTouch(HitTestResult hitTestResult, MotionEvent motionEvent) {
              Node node = hitTestResult.getNode();
              node.setParent(null);
          }
      });

是否有任何方法可以实现此功能?

Is there any method could achieve this feature?

推荐答案

下面的代码应该可以检测到触摸并删除该节点.

The code below should detect the touch and delete the node.

如果您希望有一个单独的按钮来删除所选节点，则可以添加常规按钮和侦听器，只需使用'touch'事件选择要删除的节点即可.

If you want to have a separate button to delete a selected node you can add a regular button and listener and just use the 'touch' event to select the node you want to delete.

private void handleOnTouch(HitTestResult hitTestResult, MotionEvent motionEvent) {
        Log.d(TAG,"handleOnTouch");
        // First call ArFragment's listener to handle TransformableNodes.
        arFragment.onPeekTouch(hitTestResult, motionEvent);

        //We are only interested in the ACTION_UP events - anything else just return
        if (motionEvent.getAction() != MotionEvent.ACTION_UP) {
            return;
        }

        // Check for touching a Sceneform node
        if (hitTestResult.getNode() != null) {
            Log.d(TAG,"handleOnTouch hitTestResult.getNode() != null");
            Node hitNode = hitTestResult.getNode();

            if (hitNode.getRenderable() == andyRenderable) {
                Toast.makeText(LineViewMainActivity.this, "We've hit Andy!!", Toast.LENGTH_SHORT).show();
                arFragment.getArSceneView().getScene().removeChild(hitNode);
                AnchorNode hitNodeAnchor = (AnchorNode) hitNode;
                if (hitNodeAnchor != null) {
                     hitNode.getAnchor().detach();
                }
                hitNode.setParent(null);
                hitNode = null;
             }
        }

}

以上内容摘自VR测试应用程序的各个部分，并在此处组合成一个简洁的示例-完整的应用程序源可在此处找到: https://github.com/mickod/LineView

The above is extracted from various parts of a VR test application and combined here for a concise example - the full working application source is available here: https://github.com/mickod/LineView

更新-Kotlin版本(于2020年4月测试):

Update - Kotlin version (tested April 2020):

    private fun removeAnchorNode(nodeToRemove: AnchorNode) {
        //Remove an Anchor node
        arFragment.getArSceneView().getScene().removeChild(nodeToRemove);
        nodeToRemove.getAnchor()?.detach();
        nodeToRemove.setParent(null);
        nodeToRemove.renderable = null
    }

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