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BlenderSleuth / FlyingNavSystemSupport

Support page for the Flying Navigation System
https://blendersleuth.github.io/FlyingNavSystemSite/
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Crash SVPGraph.cpp line 704 #1

Closed SebGrinke closed 3 years ago

SebGrinke commented 3 years ago

Describe the bug I implemented a flying drone in my UE4.26 game following your tutorial. I'm getting a repeated crash with the stack below. It seems to happen when I climb a ladder and am above the drone's position.

LoginId:dd59376449c3f9f4233f7496f3e650ad EpicAccountId:be6a9c659a1c4bc2871ff125ae075bbc

Unhandled Exception: EXCEPTION_ACCESS_VIOLATION reading address 0x00000112999d23b4

UE4Editor_FlyingNavSystem!FSVOPathfindingGraph::ProcessSingleLazyThetaStarNode() [D:\Build++Portal\Sync\LocalBuilds\PluginTemp\HostProject\Plugins\FlyingNavSystem\Source\FlyingNavSystem\Private\SVOGraph.cpp:704] UE4Editor_FlyingNavSystem!FSVOPathfindingGraph::FindSVOPath() [D:\Build++Portal\Sync\LocalBuilds\PluginTemp\HostProject\Plugins\FlyingNavSystem\Source\FlyingNavSystem\Private\SVOGraph.cpp:863] UE4Editor_FlyingNavSystem!FSVOPathfindingGraph::FindPath() [D:\Build++Portal\Sync\LocalBuilds\PluginTemp\HostProject\Plugins\FlyingNavSystem\Source\FlyingNavSystem\Private\SVOGraph.cpp:972] UE4Editor_FlyingNavSystem!AFlyingNavigationData::FindPath() [D:\Build++Portal\Sync\LocalBuilds\PluginTemp\HostProject\Plugins\FlyingNavSystem\Source\FlyingNavSystem\Private\FlyingNavigationData.cpp:1099] UE4Editor_NavigationSystem UE4Editor_AIModule UE4Editor_AIModule UE4Editor_AIModule UE4Editor_AIModule UE4Editor_AIModule UE4Editor_AIModule UE4Editor_AIModule UE4Editor_Engine UE4Editor_Engine UE4Editor_Engine UE4Editor_Engine UE4Editor_Core UE4Editor_Core UE4Editor_Core UE4Editor_Engine UE4Editor_Engine UE4Editor_Engine UE4Editor_Engine UE4Editor_UnrealEd UE4Editor_UnrealEd UE4Editor UE4Editor UE4Editor UE4Editor UE4Editor kernel32 ntdll

To Reproduce It's in my game so can't give you this easily

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SebGrinke commented 3 years ago

Looks like this was caused by "Allow partial path" being ticked in one of my MoveTo nodes. I've unticked that and now it's not crashing any more.

BlenderSleuth commented 3 years ago

Thanks for the bug report, I'm looking into it now

BlenderSleuth commented 3 years ago

As an update, it appears to be an issue with the lazy theta algorithm, A seems unaffected at this point

BlenderSleuth commented 3 years ago

Fixed with 1.0.7