public void DidAddNode(ISCNSceneRenderer renderer, SCNNode node, ARAnchor anchor)
{
// Place content only for anchors found by plane detection.
if (anchor is ARPlaneAnchor && this.previewNode != null)
{
// Stop showing a preview version of the object to be placed.
this.cupNode.RemoveFromParentNode();
this.previewNode?.RemoveFromParentNode();
this.previewNode?.Dispose();
this.previewNode = null;
// Add the cupNode to the scene's root node using the anchor's position.
var cameraTransform = this.sceneView.Session.CurrentFrame?.Camera?.Transform;
if (cameraTransform.HasValue)
{
this.SetNewVirtualObjectToAnchor(this.cupNode, anchor, cameraTransform.Value);
this.sceneView.Scene.RootNode.AddChildNode(this.cupNode);
// Disable plane detection after the model has been added.
var configuration = new ARWorldTrackingConfiguration {
PlaneDetection = ARPlaneDetection.Horizontal
};
this.sceneView.Session.Run(configuration, default(ARSessionRunOptions));
// Set up positional audio to play in case the object moves offscreen.
this.PlaySound();
}
}
}
/// <summary>
/// Loads the cup model (`cupNode`) that is used for the duration of the app.
/// Initializes a `PreviewNode` that contains the `cupNode` and adds it to the node hierarchy.
/// </summary>
private void SetupPreviewNode()
{
if (this.cupNode.FindChildNode("candle", false) == null)
{
// Load the cup scene from the bundle only once.
var modelScene = SCNScene.FromFile("art.scnassets/candle/candle.scn");
// Get a handle to the cup model.
var cup = modelScene.RootNode.FindChildNode("candle", true);
// Set the cup model onto `cupNode`.
this.cupNode.AddChildNode(cup);
}
// Initialize `previewNode` to display the cup model.
this.previewNode = new PreviewNode(this.cupNode);
// Add `previewNode` to the node hierarchy.
this.sceneView.Scene.RootNode.AddChildNode(this.previewNode);
}
private void ResetTracking()
{
var configuration = new ARWorldTrackingConfiguration {
PlaneDetection = ARPlaneDetection.Horizontal
};
this.sceneView.Session.Run(configuration, ARSessionRunOptions.ResetTracking | ARSessionRunOptions.RemoveExistingAnchors);
// Reset preview state.
this.cupNode.RemoveFromParentNode();
this.cupNode.Dispose();
this.cupNode = new SCNNode();
this.previewNode?.RemoveFromParentNode();
this.previewNode?.Dispose();
this.previewNode = null;
this.PlaySound();
}