/// <summary>
/// Gets the underlying pointer for the native anchor.
/// </summary>
/// <param name="anchor">
/// The native anchor to obtain the pointer for.
/// </param>
/// <param name="cancellationToken">
/// A <see cref="CancellationToken"/> that can be used to cancel the operation.
/// </param>
/// <returns>
/// A Task that yields the pointer.
/// </returns>
/// <exception cref="System.ArgumentNullException">
/// Thrown if <paramref name="anchor"/> is <see langword = "null" />.
/// </exception>
/// <exception cref="PlatformNotSupportedException">
/// Thrown if the current platform is not supported by the SDK.
/// </exception>
/// <exception cref="InvalidOperationException">
/// Thrown if a pointer could not be obtained from the native anchor.
/// </exception>
/// <exception cref="OperationCanceledException">
/// The operation was canceled.
/// </exception>
/// <remarks>
/// This method is async because ARKit cannot provide an anchor
/// pointer until at least one frame has been processed. If a pointer
/// is not returned on the first request, this operation will wait for
/// one to be created.
/// </remarks>
static public IntPtr GetPointer(this NativeAnchor anchor)
{
// Validate
if (anchor == null)
{
throw new ArgumentNullException(nameof(anchor));
}
// Placeholder
IntPtr ptr = IntPtr.Zero;
#if UNITY_ANDROID || UNITY_IOS
ptr = anchor.WorldAnchorHandle;
#elif WINDOWS_UWP || UNITY_WSA
ptr = anchor.GetNativeSpatialAnchorPtr();
#else
throw new PlatformNotSupportedException("Unable to retrieve the native anchor pointer. The platform is not supported.");
#endif
#if UNITY_EDITOR
#pragma warning disable CS0162 // Conditional compile statements prevent reaching this code in the unity editor
#endif
// Warn if the anchor didn't give us a valid value
if (ptr == IntPtr.Zero)
{
throw new InvalidOperationException("Couldn't obtain a native anchor pointer");
}
// Return the pointer
return(ptr);
#if UNITY_EDITOR
#pragma warning restore CS0162
#endif
}
/// <summary>
/// Stores the specified cloud version of the anchor and creates or updates the native anchor
/// to match.
/// </summary>
/// <param name="cloudAnchor">
/// The cloud version of the anchor.
/// </param>
/// <remarks>
/// When this method completes, <see cref="CloudAnchor"/> will point to the anchor specified
/// by <paramref name="cloudAnchor"/> and <see cref="NativeAnchor"/> will return a new or updated
/// native anchor with the same information.
/// </remarks>
public void CloudToNative(CloudSpatialAnchor cloudAnchor)
{
// Validate
if (cloudAnchor == null)
{
throw new ArgumentNullException(nameof(cloudAnchor));
}
// Apply and store updated native anchor
nativeAnchor = gameObject.ApplyCloudAnchor(cloudAnchor);
}
/// <summary>
/// Sets the pose of the attached <see cref="GameObject"/>, modifying
/// native anchors if necessary.
/// </summary>
/// <param name="gameObject">
/// The <see cref="GameObject"/> to set the pose on.
/// </param>
/// <param name="position">
/// The new position to set.
/// </param>
/// <param name="rotation">
/// The new rotation to set.
/// </param>
public void SetPose(Vector3 position, Quaternion rotation)
{
// Changing the position resets both native and cloud anchors
cloudAnchor = null;
nativeAnchor = null;
// Use extension method to update position and native anchor
gameObject.SetPose(position, rotation);
// Get the native anchor back (if there was one)
nativeAnchor = gameObject.FindNativeAnchor();
}
/// <summary>
/// Applies the specified cloud anchor to the GameObject by
/// creating or updating the native anchor.
/// to match.
/// </summary>
/// <param name="gameObject">
/// The <see cref="GameObject"/> where the cloud anchor should be
/// applied.
/// </param>
/// <param name="cloudAnchor">
/// The cloud anchor to apply.
/// </param>
/// <returns>
/// The <see cref="NativeAnchor"/> created or updated during the
/// operation.
/// </returns>
/// <exception cref="System.ArgumentNullException">
/// Thrown if <paramref name="gameObject"/> or <paramref name="cloudAnchor"/>
/// are <see langword = "null" />.
/// </exception>
/// <exception cref="PlatformNotSupportedException">
/// Thrown if the current platform is not supported by the SDK.
/// </exception>
static public NativeAnchor ApplyCloudAnchor(this GameObject gameObject, CloudSpatialAnchor cloudAnchor)
{
// Validate
if (gameObject == null)
{
throw new ArgumentNullException(nameof(gameObject));
}
if (cloudAnchor == null)
{
throw new ArgumentNullException(nameof(cloudAnchor));
}
// Placeholder
NativeAnchor nativeAnchor = null;
#if WINDOWS_UWP || UNITY_WSA
// On UWP we can just update the pointer on any existing WorldAnchor.
// Doing so will also automatically update the objects pose.
// Find or create the world anchor
nativeAnchor = gameObject.FindOrCreateNativeAnchor();
// Update the World Anchor to use the cloud-based native anchor
nativeAnchor.SetNativeSpatialAnchorPtr(cloudAnchor.LocalAnchor);
#elif UNITY_IOS || UNITY_ANDROID
// On iOS and Android we need to remove any existing native anchor,
// move the object to the new pose, and then re-apply the native anchor.
// Delete any existing native anchor
gameObject.DeleteNativeAnchor();
// Get the pose from the cloud anchor
Pose pose = cloudAnchor.GetPose();
// Move the GameObject to match the new pose
gameObject.transform.position = pose.position;
gameObject.transform.rotation = pose.rotation;
// Add the native anchor back on
nativeAnchor = gameObject.CreateNativeAnchor();
#else
throw new PlatformNotSupportedException("Unable to apply the cloud anchor. The platform is not supported.");
#endif
#if UNITY_EDITOR
#pragma warning disable CS0162 // Conditional compile statements prevent reaching this code in the unity editor
#endif
// Return the created or updated anchor
return(nativeAnchor);
#if UNITY_EDITOR
#pragma warning restore CS0162
#endif
}
/// <summary>
/// Creates or updates the <see cref="CloudSpatialAnchor"/> returned by
/// <see cref="CloudAnchor"/> to reflect the same data as the native anchor.
/// </summary>
/// <param name="useExisting">
/// <c>true</c> to reuse any existing cloud anchor; <c>false</c> to
/// always create a new one.
/// </param>
/// <returns>
/// A <see cref="Task"/> that represents the operation.
/// </returns>
/// <remarks>
/// <para>
/// If no native anchor exists on the game object it will be created.
/// </para>
/// </remarks>
public void NativeToCloud(bool useExisting)
{
// Make sure there's a native anchor
if (nativeAnchor == null)
{
nativeAnchor = gameObject.FindOrCreateNativeAnchor();
}
// If there is no cloud anchor, create it
if ((!useExisting) || (cloudAnchor == null))
{
cloudAnchor = nativeAnchor.ToCloud();
}
}
/// <summary>
/// Removes and destroys any native anchor applied to the object.
/// </summary>
/// <param name="gameObject">
/// The <see cref="GameObject"/> where the anchor should be removed.
/// </param>
/// <exception cref="System.ArgumentNullException">
/// Thrown if <paramref name="gameObject"/> is <see langword = "null" />.
/// </exception>
static public void DeleteNativeAnchor(this GameObject gameObject)
{
// Validate
if (gameObject == null)
{
throw new ArgumentNullException(nameof(gameObject));
}
// Try to find the native anchor
NativeAnchor nativeAnchor = FindNativeAnchor(gameObject);
// If found destroy (which will also remove it)
if (nativeAnchor != null)
{
GameObject.DestroyImmediate(nativeAnchor);
}
}
/// <summary>
/// Creates or updates the <see cref="CloudSpatialAnchor"/> returned by
/// <see cref="CloudAnchor"/> to reflect the same data as the native anchor.
/// </summary>
/// <param name="anchor">
/// The native anchor to convert to a cloud anchor.
/// </param>
/// <returns>
/// A Task that yields the <see cref="CloudSpatialAnchor"/>.
/// </returns>
/// <exception cref="System.ArgumentNullException">
/// Thrown if <paramref name="anchor"/> is <see langword = "null" />.
/// </exception>
/// <remarks>
/// This method is async because ARKit needs to process at least one
/// frame before any requested anchor is fully created. This method
/// will return only after any underlying native processes are
/// complete.
/// </remarks>
static public CloudSpatialAnchor ToCloud(this NativeAnchor anchor)
{
// Validate
if (anchor == null)
{
throw new ArgumentNullException(nameof(anchor));
}
// Get the native pointer
IntPtr ptr = anchor.GetPointer();
// Create the cloud version
CloudSpatialAnchor cloudAnchor = new CloudSpatialAnchor();
// Set the local pointer
cloudAnchor.LocalAnchor = ptr;
// Done!
return(cloudAnchor);
}
/// <summary>
/// Returns any existing anchor if found; otherwise, creates and returns
/// a new anchor.
/// </summary>
/// <param name="gameObject">
/// The <see cref="GameObject"/> to search for or add the anchor.
/// </param>
/// <returns>
/// The existing or newly created native anchor.
/// </returns>
/// <exception cref="System.ArgumentNullException">
/// Thrown if <paramref name="gameObject"/> is <see langword = "null" />.
/// </exception>
static public NativeAnchor FindOrCreateNativeAnchor(this GameObject gameObject)
{
// Validate
if (gameObject == null)
{
throw new ArgumentNullException(nameof(gameObject));
}
// Try to find an existing anchor
NativeAnchor anchor = FindNativeAnchor(gameObject);
// If not found, create
if (anchor == null)
{
anchor = CreateNativeAnchor(gameObject);
}
// Return the anchor
return(anchor);
}
protected virtual void Awake()
{
// If there's already a native anchor, go ahead and reference it
nativeAnchor = gameObject.FindNativeAnchor();
}
