private NavigationMeshGroupData Load(NavigationMesh mesh, Guid groupId)
{
if (mesh == null || groupId == Guid.Empty)
{
return(null);
}
NavigationMeshData data;
if (!loadedNavigationMeshes.TryGetValue(mesh, out data))
{
loadedNavigationMeshes.Add(mesh, data = new NavigationMeshData
{
NavigationMesh = mesh
});
}
NavigationMeshGroupData groupData;
if (!data.LoadedGroups.TryGetValue(groupId, out groupData))
{
NavigationMeshLayer layer;
if (!mesh.Layers.TryGetValue(groupId, out layer))
{
return(null); // Group not present in navigation mesh
}
data.LoadedGroups.Add(groupId, groupData = new NavigationMeshGroupData
{
Data = data,
RecastNavigationMesh = new RecastNavigationMesh(mesh),
Id = groupId,
});
// Add initial tiles to the navigation mesh
foreach (var tile in layer.Tiles)
{
if (!groupData.RecastNavigationMesh.AddOrReplaceTile(tile.Value.Data))
{
throw new InvalidOperationException("Failed to add tile");
}
}
}
groupData.AddReference();
return(groupData);
}
/// <summary>
/// Removes a reference to a group
/// </summary>
private void Unload(NavigationMeshGroupData group)
{
int referenceCount = group.Release();
if (referenceCount < 0)
{
throw new ArgumentOutOfRangeException();
}
if (referenceCount == 0)
{
// Remove group
var data = group.Data;
data.LoadedGroups.Remove(group.Id);
// Remove data
if (data.LoadedGroups.Count == 0)
{
loadedNavigationMeshes.Remove(data.NavigationMesh);
}
}
}
private void UpdateNavigationMesh(AssociatedData data)
{
var navigationMeshToLoad = data.Component.NavigationMesh;
if (navigationMeshToLoad == null && dynamicNavigationMeshSystem != null)
{
// Load dynamic navigation mesh when no navigation mesh is specified on the component
navigationMeshToLoad = dynamicNavigationMeshSystem?.CurrentNavigationMesh;
}
NavigationMeshGroupData loadedGroup = Load(navigationMeshToLoad, data.Component.GroupId);
if (data.LoadedGroup != null)
{
Unload(data.LoadedGroup);
}
data.Component.RecastNavigationMesh = loadedGroup?.RecastNavigationMesh;
data.LoadedGroup = loadedGroup;
UpdateSceneOffset(data);
}