/// <summary>
/// Get the changes (added, updated, and removed) planes since the last call to <see cref="GetChanges(Allocator)"/>.
/// </summary>
/// <param name="defaultPointCloud">
/// The default point cloud. This should be used to initialize the returned <c>NativeArray</c>s for backwards compatibility.
/// See <see cref="TrackableChanges{T}.TrackableChanges(void*, int, void*, int, void*, int, T, int, Allocator)"/>.
/// </param>
/// <param name="allocator">An <c>Allocator</c> to use when allocating the returned <c>NativeArray</c>s.</param>
/// <returns>
/// <see cref="TrackableChanges{T}"/> describing the reference points that have been added, updated, and removed
/// since the last call to <see cref="GetChanges(Allocator)"/>. The changes should be allocated using
/// <paramref name="allocator"/>.
/// </returns>
public abstract TrackableChanges <XRPointCloud> GetChanges(XRPointCloud defaultPointCloud, Allocator allocator);
/// <summary>
/// Get the changes (added, updated, and removed) planes since the last call to <see cref="GetChanges(Allocator)"/>.
/// </summary>
/// <param name="defaultPointCloud">
/// The default reference point. This should be used to initialize the returned <c>NativeArray</c>s for backwards compatibility.
/// See <see cref="TrackableChanges{T}.TrackableChanges(void*, int, void*, int, void*, int, T, int, Allocator)"/>.
/// </param>
/// <param name="allocator">An <c>Allocator</c> to use when allocating the returned <c>NativeArray</c>s.</param>
/// <returns>
/// <see cref="TrackableChanges{T}"/> describing the reference points that have been added, updated, and removed
/// since the last call to <see cref="GetChanges(Allocator)"/>. The changes should be allocated using
/// <paramref name="allocator"/>.
/// </returns>
public virtual TrackableChanges <XRPointCloud> GetChanges(
XRPointCloud defaultPointCloud,
Allocator allocator)
{
return(default(TrackableChanges <XRPointCloud>));
}