Version: 2019.2
WMR testing during development
HoloLens Anchor Sharing

HoloLens WorldAnchor persistence

Persistence is a system for saving World Anchor states across multiple runs of the same application. This can be thought of as a “save game” functionality for physical locations in the real world. An example of this is remembering where a game board is placed in the world when the application re-launches.

The WorldAnchorStore provides basic functionality for saving and loading World Anchors. Retrieve a WorldAnchorStore by calling WorldAnchorStore.GetAsync and providing it with a callback. Your callback saves the WorldAnchorStore returned so that it can be used for future operations.

To save an existing World Anchor, give it a name and call the Save function on the WorldAnchorStore. See an example below:

private void SaveAnchor()
{
    if (!this.savedAnchor) // only save this once
    {
        this.savedAnchor = this.MyWorldAnchorStore.Save("MyAnchor", MyWorldAnchor);
        if (!this.savedAnchor)
        {
            // Anchor failed to save to the store.
            // Handle errors here.
        }
    }
}

Loading is essentially a reflection of the above:

private void LoadAnchor()
{
    this.savedAnchor = this.MyWorldAnchorStore.Load("MyAnchor", MyWorldAnchor);
    if (!this.savedAnchor)
    {
        // An anchor with that name wasn't saved to the store.  
        // Handle errors here.
    }
}

To remove an anchor from the store, call the Delete method on the WorldAnchorStore. To remove all anchors from the store, call the Clear method.

WMR testing during development
HoloLens Anchor Sharing