Unreal Engine Issues
Unreal Engine Issues
Merge Actors Tool Simplifies Nanite Meshes
UE - World Creation - Worldbuilding Tools - Merge Actor - May 19, 2023Tried every combination of LOD Selection Type, Nanite enanbled/disabled, the only way it would seem to get the full number of triangles from the source mesh into the merged mesh is to disable Nanite ...
Crash at compile time when using a VariableSet node with a local variable created by pasting a private property
UE - Framework - Blueprint - Oct 7, 2025When a property is created in this way, a local variable with a Private flag is generated. Since such a variable is generally not desirable, it would be better to remove the Private flag upon pastin ...
Static code functions cause associated blueprints to not compile after a hot reload
UE - Foundation - Cpp Tools - Hot Reload - Oct 14, 2016If a function inside a BlueprintFunctionLibrary class is declared as static, instances of the function node inside blueprints cause the blueprint to not save after a hot reload. This does not affec ...
Rotating a static mesh makes it slightly smaller
UE - Gameplay - Jan 11, 2017If a static mesh is rotated 180 degrees, it is made slightly smaller than it usually is. There are some other degrees that can give the same effect without the shrinking, such as 540. Regression?: ...
"Fill Data Table from CSV File" crashes packaged project.
Tools - Sep 18, 2018Using "Fill Data Table from CSV File" node in packaged project crashes instantly. User acknowledges that they are misusing this node and requests that limitations are documented. (Editor only Tool ...
Edited properties of replicated components created via the "AddComponent" BP node aren't correct on clients
UE - Networking - Oct 8, 2019When properties are customized on an Add Component node, and the component is replicated, the client will create the component without the customized properties. This is likely due to subobject repl ...
Blueprint compiler doesn't always initialize struct consts correctly
UE - Framework - Blueprint Compiler - May 1, 2025Blueprints currently don't support unsigned 64 bit ints, but they do support signed 64 bits. If a Blueprint uses a native struct variable that contains a uint64 property, it incorrectly assigns that ...
Line traces don't consistently trigger when colliding between landscape components
UE - Simulation - Physics - Mar 15, 2015Landscapes do not consistently return "hit" on traces. Lots of AH posts on this topic, and votes on public tracker: [Link Removed] ...
Rotating an instanced static mesh
UE - LD & Modeling - Modeling Tools - Mesh Editing - Oct 16, 2019Changing the rotation of an instanced static mesh by 90 or 180 degrees creates a small space in between meshes. ...
STAT_AI_BehaviorTree_InstanceMemory is sometimes wildly inaccurate
UE - AI - Jun 10, 2020From the UDN thread: Turns out this is caused by the way this stat was implemented for the FBehaviorTreeInstance struct: 1) You call IncMemoryStats on construct, before the struct is populated with ...