ARCORE:通过单击此可渲染对象来删除特定的可渲染对象 [英] ARCORE: remove a specific renderable by clicking on this renderable

问题描述

我正在使用 ARCore 的 Sceneform 进行一个项目.我基于 ARCore 提供的 HelloSceneform 示例开发它.我想要做的是通过点击添加一个可渲染对象，然后当我单击屏幕上的特定可渲染对象时将其删除.我试过方法 AnchorNode.setOnTapListener 如下，但它没有工作(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);
                          }
                      }
                  });

我也尝试了以下方法，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);
          }
      });

有什么方法可以实现这个功能吗?

Is there any method could achieve this feature?

推荐答案

下面的代码应该检测触摸并删除节点.

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

如果您想有一个单独的按钮来删除选定的节点，您可以添加一个常规按钮和侦听器，然后只需使用 'touch' 事件来选择您要删除的节点.

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，并在此处合并为一个简洁的示例 - 完整的工作应用程序源可在此处获得: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(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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