// It is recommended to deserialize a scene from scene fragments
// consider all scenes as made up of scene fragments, even if only one.
private SceneFragment GetLatestSceneSerialization()
{
SceneFragment fragmentToReturn = null;
lock (SUDataLock)
{
if (LatestSUSceneData != null)
{
byte[] sceneBytes = null;
int sceneLength = LatestSUSceneData.Length;
sceneBytes = new byte[sceneLength];
Array.Copy(LatestSUSceneData, sceneBytes, sceneLength);
// Deserialize the scene into a Scene Fragment
fragmentToReturn = SceneFragment.Deserialize(sceneBytes);
}
}
return(fragmentToReturn);
}
/// <summary>
/// This coroutine will deserialize the latest SU data, either queried from the device
/// or from disk and use it to create Unity Objects that represent that geometry
/// </summary>
/// <param name="completionSource">
/// The <see cref="TaskCompletionSource{TResult}"/> that can be used to signal the coroutine is complete.
/// </param>
private IEnumerator DisplayDataRoutine(TaskCompletionSource <bool> completionSource)
{
Debug.Log("SceneUnderstandingManager.DisplayData: About to display the latest set of Scene Objects");
Scene suScene = null;
// Get Latest Scene and Deserialize it
// Scenes Queried from a device are Scenes composed of one Scene Fragment
SceneFragment sceneFragment = GetLatestSceneSerialization();
SceneFragment[] sceneFragmentsArray = new SceneFragment[1] {
sceneFragment
};
suScene = Scene.FromFragments(sceneFragmentsArray);
// Get Latest Scene GUID
Guid latestGuidSnapShot = GetLatestSUSceneId();
LastDisplayedSceneGuid = latestGuidSnapShot;
if (suScene != null)
{
// Retrieve a transformation matrix that will allow us orient the Scene Understanding Objects into
// their correct corresponding position in the unity world
System.Numerics.Matrix4x4?sceneToUnityTransformAsMatrix4x4 = GetSceneToUnityTransformAsMatrix4x4(suScene);
if (sceneToUnityTransformAsMatrix4x4 != null)
{
// If there was previously a scene displayed in the game world, destroy it
// to avoid overlap with the new scene about to be displayed
DestroyAllGameObjectsUnderParent(SceneRoot.transform);
// Allow from one frame to yield the coroutine back to the main thread
yield return(null);
// Using the transformation matrix generated above, port its values into the tranform of the scene root (Numerics.matrix -> GameObject.Transform)
SetUnityTransformFromMatrix4x4(SceneRoot.transform, sceneToUnityTransformAsMatrix4x4.Value, true);
// After the scene has been oriented, loop through all the scene objects and
// generate their corresponding Unity Object
IEnumerable <SceneObject> sceneObjects = suScene.SceneObjects;
int i = 0;
foreach (SceneObject sceneObject in sceneObjects)
{
if (DisplaySceneObject(sceneObject))
{
if (++i % NumberOfSceneObjectsToLoadPerFrame == 0)
{
// Allow a certain number of objects to load before yielding back to main thread
yield return(null);
}
}
}
}
// When all objects have been loaded, finish.
Debug.Log("SceneUnderStandingManager.DisplayData: Display Completed");
// Run CallBacks for Onload Finished
OnLoadFinished.Invoke();
// Let the task complete
completionSource.SetResult(true);
}
}