如何在Scenform（AR CORE）中向现实世界添加屏幕触摸坐标？

Question

我想在AR视图中添加图像。 我可以在渲染平面时添加图像。但我想在没有渲染平面的情况下也能添加。我想把它添加到AR视图的现实世界位置--我实际上是想把那个接触点转换为AR视图的世界位置。

   List<HitResult> hitResult = frame.hitTest(motionEvent);

                if (hitResult.size() != 0) {

//This code works fine
                    HitResult hit = hitResult.get(0);
                    Anchor anchor = hit.createAnchor();
                    AnchorNode anchorNode = new AnchorNode(anchor);
                    anchorNode.setParent(arFragment.getArSceneView().getScene());
                    anchors.add(anchor);


                } else {


//This is not Working

                    if (arFragment.getArSceneView().getSession() != null) {

                        Anchor anchor = arFragment.getArSceneView().getSession().createAnchor(frame.getCamera().getPose().compose(Pose.makeTranslation(0, 0, -1f)).extractTranslation());
                        AnchorNode anchorNode = new AnchorNode(anchor);
                        anchorNode.setParent(arFragment.getArSceneView().getScene());
                        anchors.add(anchor);

                        if (drawingText.equalsIgnoreCase("imagearrow")) {
                            addArrow(anchorNode, arrowType, arrowColor);
                        } 
                    }
                }

我没有得到AR视图中触摸点的准确位置。

Answer 1

经过大量的工作，我能够找到答案.你必须根据你的相机的射线位置创建姿势，并根据你的相机位置和相机的射线点计算位置和旋转。

Camera camera = arFragment.getArSceneView().getScene().getCamera();

                        Ray ray = camera.screenPointToRay(motionEvent.getX(), motionEvent.getY());
                        Vector3 drawPoint = ray.getPoint(1f);


                        Log.d("HELLODRWAPOINT", String.valueOf(drawPoint.x));

                        ArSceneView arSceneView = arFragment.getArSceneView();
                        com.google.ar.core.Camera coreCamera = arSceneView.getArFrame().getCamera();
                        if (coreCamera.getTrackingState() != TrackingState.TRACKING) {
                            return;
                        }

                        float[] position = { drawPoint.x, drawPoint.y, drawPoint.z};
                        float[] rotation = { camera.getWorldRotation().x,camera.getWorldRotation().y,camera.getWorldRotation().z, camera.getWorldRotation().w };

                        Session session = arFragment.getArSceneView().getSession();
                        Anchor anchor = session.createAnchor(new Pose(position, rotation));
                        AnchorNode anchorNode = new AnchorNode(anchor);
                        anchorNode.setParent(arFragment.getArSceneView().getScene());
                        anchors.add(anchor);