CompareBaseObjectsInternal error updating graphs

General
1

Hi, I’m using unity 4.3 and A* 3.3.10. I have a recast graph on some procedural terrain which is started via script by AstarPath.active.Awake();. This works fine and my seeker moves around. However, if I modify the terrain dynamically and try to update it for A* by using:

Bounds currentBounds = new Bounds (transform.position, new Vector3 (4, 4, 4));
AstarPath.active.UpdateGraphs(currentBounds, 1);

I get two errors:

CompareBaseObjectsInternal can only be called from the main thread.
Constructors and field initializers will be executed from the loading thread when loading a scene.
Don’t use this function in the constructor or field initializers, instead move initialization code to the Awake or Start function.

Exception while updating graphs:
System.ArgumentException: CompareBaseObjectsInternal can only be called from the main thread.
Constructors and field initializers will be executed from the loading thread when loading a scene.
Don’t use this function in the constructor or field initializers, instead move initialization code to the Awake or Start function.
at (wrapper managed-to-native) UnityEngine.Object:CompareBaseObjectsInternal (UnityEngine.Object,UnityEngine.Object)
at UnityEngine.Object.CompareBaseObjects (UnityEngine.Object lhs, UnityEngine.Object rhs)

I’ve tried turning off multithreading and pretty much all the other optimizations that look relevant. Any idea?

2

Hm…

So it looks like the recast graph updater is trying to access unity objects from another thread.
Updates to recast graphs are being run in another thread, but I thought I made sure that all access to Unity stuff is done in the Unity thread…

Is there any way you can get a more exact stacktrace from it?

As a quick fix, open the RecastGenerator.cs file and edit the CanUpdateAsync method.
It should return GraphUpdateThreading.UnityThread instead of GraphUpdateThreading.SeparateAndUnityInit.