/// <summary>
/// Get the surface with the highest priority for retrieving the mesh. Surfaces
/// without meshes are prioritized before those with outdated ones, and older
/// ones are prioritized before newer ones.
/// </summary>
/// <returns></returns>
private ISpatialSurface GetHighestPrioritySurface()
{
ISpatialSurface highestPrioritySurface = null;
foreach (KeyValuePair <int, ISpatialSurface> surface in _surfaceEntries)
{
// Only consider surfaces with out of date/without meshes
if (surface.Value.MeshStatus != SurfaceMeshStatuses.UP_TO_DATE)
{
if (highestPrioritySurface == null)
{
highestPrioritySurface = surface.Value;
}
else
{
// Missing meshes before outdated meshes
if (surface.Value.MeshStatus < highestPrioritySurface.MeshStatus)
{
highestPrioritySurface = surface.Value;
}
// Older meshes first
else if (surface.Value.UpdateTime < highestPrioritySurface.UpdateTime)
{
highestPrioritySurface = surface.Value;
}
}
}
}
return(highestPrioritySurface);
}
/// <summary>
/// Checks if the surface observer needs to be updated, if a new mesh request should be started,
/// finds the surface with highest priority, and sends a new request for a mesh
/// </summary>
private void Update()
{
if (_doUpdates)
{
// Updating the surface observer is a very expensive procedure, so only do it at the specified intervals
if (Time.realtimeSinceStartup > _previousUpdate + _updateInterval)
{
UpdateBoundingVolume();
try
{
_surfaceObserver.Update(SurfaceChangedHandler);
}
catch
{
// Bad callbacks can throw errors
Debug.LogError("SpatialMapper Error: Unexpected failure when updating the surface observer!");
}
_previousUpdate = Time.realtimeSinceStartup;
}
// If there is no current mesh request, start a new one
if (!_meshRequestInProgress)
{
ISpatialSurface highestPrioritySurface = GetHighestPrioritySurface();
if (highestPrioritySurface != null)
{
SurfaceData sd;
sd.id.handle = highestPrioritySurface.Id;
sd.outputMesh = highestPrioritySurface.Mesh;
sd.outputCollider = highestPrioritySurface.Collider;
sd.outputAnchor = highestPrioritySurface.Anchor;
sd.trianglesPerCubicMeter = _trianglesPerCubicMeter;
sd.bakeCollider = sd.outputCollider != null;
try
{
if (_surfaceObserver.RequestMeshAsync(sd, SurfaceDataReadyHandler))
{
_meshRequestInProgress = true;
}
else
{
Debug.LogErrorFormat("SpatialMapper Error: Mesh request for {0} failed. Check that {0} is a valid Surface ID.", sd.id);
}
}
catch
{
// Failure can happen if the data structure is filled out wrong
Debug.LogErrorFormat("SpatialMapper Error: Mesh request for {0} failed unexpectedly.", sd.id);
}
}
}
}
}
/// <summary>
/// This method handles observed changes to surfaces (added, updated, or removed).
/// These changes have their source in the update loop where the surface observer
/// is updated.
/// </summary>
/// <param name="id">The unique id of the surface</param>
/// <param name="changeType">Says if the surface has been added, updated, or removed</param>
/// <param name="bounds">The axis aligned bounding box containing the surface</param>
/// <param name="updateTime">Time of the update</param>
private void SurfaceChangedHandler(SurfaceId id, SurfaceChange changeType, Bounds bounds, DateTime updateTime)
{
ISpatialSurface surface = null;
switch (changeType)
{
case SurfaceChange.Added:
case SurfaceChange.Updated:
if (_surfaceEntries.TryGetValue(id.handle, out surface))
{
if (surface.MeshStatus == SurfaceMeshStatuses.UP_TO_DATE)
{
surface.MeshStatus = SurfaceMeshStatuses.OUTDATED;
surface.UpdateTime = updateTime;
}
}
else
{
surface = _surfaceEntryFactory.Create(updateTime, id.handle, _castShadows, _recieveShadows, _meshMaterial, _addColliders, _physicMaterial);
surface.Instance.transform.SetParent(_meshParent != null ? _meshParent : transform, false);
_surfaceEntries[id.handle] = surface;
}
break;
case SurfaceChange.Removed:
if (_surfaceEntries.TryGetValue(id.handle, out surface))
{
_surfaceEntries.Remove(id.handle);
Mesh mesh = surface.Mesh.mesh;
if (mesh)
{
Destroy(mesh);
}
Destroy(surface.Instance);
}
break;
default:
break;
}
}