Writing Graph Generators: No graph of type 'PolarGraph'

[MaverickDQ]

Hello,

I’m trying to follow documentation and write a graph generator that extends point graph. However I’m constantly getting Caught exception while deserializing data. System.Exception: No graph of type 'PolarGraph' could be created, type does not exist at Pathfinding.Serialization.GraphMeta.GetGraphType (System.Int32 index)

I’ve copied your example from documentation, graph can be added to scene and scanned, but when scene is run or reloaded I have this error as well and graph disappears from the list. Could you please advise?

Using A* 4.2.4, Unity 2018.3.0

Thanks.

[MaverickDQ]

Sorry to bump this up. Tried all solutions found in this forum, but with no result.

[Hunted]

There’s currently an issue where graphs defined in a different assembly can’t be found when loading from saved data/deserializing.
Here’s another thread about it with a couple of workarounds:

[BUG/Feature Request] Custom Graphs Need to be in Same Assembly

When trying to create a custom graph (such as the example polar graph) they have to be in the same assembly as AstarPath.cs, which meant that I needed to put custom graphs into the same folder as all the other generators, as opposed to in my own folder. In the documentation, this isn’t mentioned, and I had to dive into the deserialization code to understand why my custom graph wasn’t deserializing. It would cause the inspector to clear out all the created graphs on play, if any of them were in …

I added the workaround at the end by founderio to AstarPathfindingProject/Core/Serialization/JsonSerializer.cs and my custom graph now loads properly without needing to be in an astar subfolder anymore.

[MaverickDQ]

Thanks, I’ll try your solution.

[aron_granberg]

Hi

Thanks for reporting this.
I have uploaded version 4.2.5 now which fixes this bug (or it will be uploaded in a few minutes at least).

You can download it at https://www.arongranberg.com/astar/download