Unreal Engine Issues
Unreal Engine Issues
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 ...
UDataTableFunctionLibrary::AddDataTableRow() fails for blueprint-defined row structure types
UE - Framework - Blueprint - Feb 2, 2024The editor-scripting blueprint node "Add Data Table Row" fails when the Data Table uses a Row Structure that was defined in blueprint. Internally, it checks if the passed-in UScriptStruct is derived ...
Niagara Fails to Compile Shader For iOS and Android
UE - Niagara - Aug 2, 2018Niagara fails to compile shader for iOS and Android. Unable to test in 4.19 due to assets provided being created in 4.20. Found in 4.20 CL# 4233996 and 4.21 CL# 4247867 ...