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DoN's 3D-Pathfinding / Flying-AI system (with full source!)

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    Originally posted by Mavmat View Post
    Hi everyone,

    Information seems spread out over multiple threads and pages and the dev hasn't been very communicative recently (though I do see the game is being worked on). In light of this, I felt it worthwhile to start up a Discord to see if we can better organise the community that exists around this project. To start, I've compiled a few methods of building for other engine versions and listed these in the #guides channel. I've also summarised a few important links.

    I'm not a C++ programmer by trade, so I won't be able to assist with anything in-depth but it's my hope that this might help in a small way to save the neat functionality this plugin has.

    If the author decides to pick it back up, I'm more than happy to hand over control of the server.

    Here's the link:
    Also, keep an eye (and Discord exposure) to this 3D nav plugin, "uesvon" (last update 2 months ago):


      SwenYan Thank you so much for this. I have been struggling to do the same thing for a while. Very much appreciated.
      Stygian Abyss Demo VR Remake


        In need of some help. I have Don's AI working mostly the way I want it. However, the issue I am having while using the Pursuit BT is the Goal Bot. If I have my player in the scene, I can assign it as the goal, the AI pursues it, etc. However, my character gets spawned in at run time. In order for that work, what I have to do is eject from the scene, grab the enemy, add my character to the goal, then possess my character and play. Then the bot pursues me. Does anyone know how to set the goal bot at runtime or have it use the equivalent of a prefab (I am not quite sure what Unreal considers those other than BP Meshes)? The information out there for doing something like this is very sparse...

        Additional info is I am using Don's AI with the Side Scroller Shooter Kit making a 2.5d side scroller with full 3d characters and objects.

        Any help would be greatly appreciated.



          Originally posted by BoBosan View Post
          For anyone who encounter this error.

          The cause is that pawn's current location is outside DonNavigation's bound.
          So, the NavigationManager variable point to nullptr. In C++, It's possible to dereference nullptr without getting exception but getting crash inside object instead.
          Unfortunately I'm getting this error and my pawn is clearly well inside the navigation bounds.

          Though switching from bound to unbound manager does make it work. However I've verified that my pawn is well inside the bounds of the bound manager and I'm getting that error.
          Last edited by crossmr; 07-29-2020, 12:32 AM.


            Thank you very much SwenYan!


              I'm Using the version 4.24 but I'm enable to package the project, I have a this error massage: ERROR: Missing precompiled manifest for 'DonAINavigation'. This module was most likely not flagged for being included in a precompiled build - set 'PrecompileForTargets = PrecompileTargetsType.Any;' in to override.
              PackagingResults: Error: Missing precompiled manifest for 'DonAINavigation'. This module was most likely not flagged for being included in a precompiled build - set 'PrecompileForTargets = PrecompileTargetsType.Any;' in to override.

              I try to move the plugin to my project folder and manage to package the project but game didn't now run at all.
              I'm suck at programming so I ave no idea how to fix this. It's seem there is some information missing in build.cs file and you need c# no modify it.

              Hope someone have an idea on how to fix this.

              If unreal 4.26 or 5.0 don't come with a 3D nav for flying AI, I will be very pist off.



                Thanks so much for your previous posts. Is there any chance of a 4.26 version? Also would you be so kind as to create a step by step instuctions on how to do this myself and not keep bothering you. Thanks
                Stygian Abyss Demo VR Remake



                  It is really easy to use it on 4.26. Just download the latest version (4.25), find "DonAINavigation.uplugin" in plugin folder, open it with NotePad and find the version. You will see something like "4.25.0". Change it to "4.26.0" and save it. It's done. At least it worked on me.
                  Check our game project "BLIND DESCENT"


                    Do anyone have what's wrong here? My project keeps crashing with this error:

                    Unhandled Exception: EXCEPTION_ACCESS_VIOLATION reading address 0xffffffff
                    UE4Editor_DonAINavigation_0001!ADonNavigationManager::SchedulePathfindingTask() [C:\Users\diego\Documents\Unreal Projects\DemoProject\Plugins\DonAINavigation-master\Source\DonAINavigation\Private\DonNavigationManager.cpp:2137]
                    UE4Editor_DonAINavigation_0001!ADonNavigationManager::execSchedulePathfindingTask() [C:\Users\diego\Documents\Unreal Projects\DemoProject\Plugins\DonAINavigation-master\Intermediate\Build\Win64\UE4Editor\Inc\DonAINavigation\DonNavigationManager.gen.cpp:1741]
                    Check our game project "BLIND DESCENT"


             here 4.26 version. i tested and everything ok


                        How to make an actor fly randomly, and when a player steps into range, fly to him?
                        The game freezes and hangs whenever the random destination location has collision.

                        There's a variable "Auto Correction Guess List” in the DoNNavigationManagerVolume which I have a hard time trying to figure out. I think it can solve my issue.
                        Can anyone point me in the right direction?
                        Last edited by artglyph; 02-26-2021, 01:01 PM. Reason: Clarity