Character lag when rescan and other scan questions

General
#1

Hi,

I have seen a few threads like this but have yet to determine if this is the way A* works or if there is a way around this issue. I am using Beta.

If I go down the route of re-scanning my graphs (recast), this happens:

I am controlling my character (running), and within my run a NPC comes into my graph area (250x250), so I scan my in order to use A*. The issue is that my character lags for a split second while the graph is scanned, it might just be 80-120ms spike, but its very noticeable within gameplay. As far as I have read, threads will not help as the scan is done on unity’s main thread, correct?

If yes, is there a way around this and still use a scan in my situation?

I am using the following rescan code that I have found in your documentation:

		IEnumerator UpdateGraphCoroutine ()
        {
            foreach (Progress progress in AstarPath.active.ScanAsync()) {
                //Debug.Log("Scanning... " + progress.description + " - " + (progress.progress*100).ToString("0") + "%");
                yield return null;
            }
        }

I also not determine that following by reading the documentation, can you please answer:

  1. Can you use GraphUpdateScene for recasts?
  2. Does recasttileupdate, recasttileupdatehandler and GraphUpdateScene just update current scanned graph? Or can you use these to add to an existing graph?

Thanks.

#2

did you find any solution for this?
because i cant

#3

I did not find a solution so have dropped A* for this project.

#4

Hi

Sorry for the super late reply.

Yes, though in your case you probably want a raw GraphUpdateObject (or just AstarPath.active.UpdateGraph(bounds)) since it’s easier to use from code.

They all update the current graph.

In the beta almost everything in the recast scan is done in a separate thread. One major thing that cannot be done in a separate thread is to collect the meshes that have to be scanned. I would recommend using colliders (enable rasterize colliders in the recast graph settings) and not meshes because colliders can be found in a more optimized way.

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