Unreal Engine Issues
Unreal Engine Issues
BlueprintNativeEvent functions break on hot reload
UE - Gameplay - Blueprint - Mar 7, 2015A blueprint that uses a node for a BlueprintNativeEvent function breaks on hot reload. Blueprint cannot be saved or compiled. Compile error states: Error This blueprint (self) is not a HOTRELOADED ...
SetMaterial allows the user to add a Material which updates the GetMaterials array but not GetNumMaterials
UE - Gameplay - Jan 15, 2015SetMaterial allows the user to add a Material which updates the GetMaterials array but not GetNumMaterials. The user who reported this was trying to add a material to a skeletal mesh during runtim ...
Crash when setting Project to only use Windows and DX11 with texture compression as BC7
UE - Graphics Features - Jan 11, 2016When user sets their texture compression to BC7 while the project settings are set for Platform to only be Windows and use only DX11 this will cause any textures with this set to cause a crash when ...
Setting Pressed Sound for Widget Style Doesn't Set the Value
UE - Editor - UI Systems - Nov 6, 2015Attempting to set the Pressed Sound for Widget Style dynamically never actually sets the sound. When you click the button, you get no pressed sound. However, when setting the Pressed Sound through t ...
tvOS crash on startup with Shared Material Shader Code enabled
UE - Platform - Mobile - Jul 9, 2019Enabling Shared Material Shader Code will cause a crash on tvOS From user: "We originally enabled Share Material Shader Code long before trying a tvOS build, making this crash tricky to debug. W ...
Child actor passes a string to it's parent's overloaded constructor the incorrect string is received
UE - Gameplay - Sep 24, 2019When a child actor passes a string to it's parent's overloaded constructor using an overridden function that returns a string it won't receive the correct string. I have verified that the correct fu ...
Masked TwoSided material causing lumen direct lighting to leak through walls
UE - Graphics Features - Lumen - Apr 23, 2024It appears that LumenScene's Hardware Ray Tracing is causing light leaking into a sealed room (which should be perfectly black). This bug does not appear to happen on AMD GPUs. ...
Custom node not working with material attributes
UE - Rendering Architecture - Materials - Jul 15, 2024Using Material Attributes as an input to a Custom Expression causes the HLSL Translator to create multiple CustomExpression# functions, for each used member of the Material Attributes, rather than u ...
High Virtual Texture Sample/Lookup Cost when using a Virtual Texture in a Material Layer Blend
UE - Rendering Architecture - Materials - Mar 14, 2025Some Material Attribute blends in Material Layer Blends can cause Virtual Texture samples to be duplicated in HLSL. This can be avoided by sampling the Virtual Texture in the Parent Material, and pa ...
Packed level actors and Level instances are sometimes not included in HLOD build on a World Partition Level
UE - World Creation - Worldbuilding Tools - HLOD - Mar 14, 2025Context World Partition - Hierarchical Level of Detail (HLOD) system uses custom HLOD Layers to organize large amounts of Static Mesh Actors and generate a single proxy mesh and Material. Problem T ...