使用场景形式在图像上渲染视频

Question

当检测到图像时，我能够成功在图像上渲染视频。问题是，当我从该位置删除图像时，视频仍继续在该位置显示，而该图像不再存在。下面是我用来创建ARScene时的代码。

  private fun createArScene() {
    // Create an ExternalTexture for displaying the contents of the video.
    externalTexture = ExternalTexture().also {
        mediaPlayer.setSurface(it.surface)
    }

    // Create a renderable with a material that has a parameter of type 'samplerExternal' so that
    // it can display an ExternalTexture.
    ModelRenderable.builder()
        .setSource(requireContext(), R.raw.augmented_video_model)
        .build()
        .thenAccept { renderable ->
            videoRenderable = renderable
            renderable.isShadowCaster = false
            renderable.isShadowReceiver = false
            renderable.material.setExternalTexture("videoTexture", externalTexture)
        }
        .exceptionally { throwable ->
            Log.e(TAG, "Could not create ModelRenderable", throwable)
            return@exceptionally null
        }

    videoAnchorNode = VideoAnchorNode().apply {
        setParent(arSceneView.scene)
    }
  }

所以我相信我需要继续检查externalTexture对象，但问题是我的系统将如何知道我不再关注图像了。这样我才能杀死它？

Answer 1

在更新侦听器上，您可以跟踪下面的图像，

Frame frame = arFragment.getArSceneView().getArFrame();
    Collection<AugmentedImage> augmentedImages = 
frame.getUpdatedTrackables((AugmentedImage.class));
    for (AugmentedImage image: augmentedImages){
        if(image.getTrackingState() == TrackingState.TRACKING){
            if(image.getName().equals("image")){

                isImageDetected = true;

                playVideo(image.createAnchor(image.getCenterPose()), 
image.getExtentX(), image.getExtentZ());
                break;
            }
        }
    }

您可以检查跟踪状态，例如已停止，已暂停和正在跟踪