Unreal Engine Issues
Unreal Engine Issues
FBatchedElements::Draw - OrthoZoomFactor can be reset to 1.0f if Line.bScreenSpace is ever false
UE - Graphics Features - Feb 20, 2017A licensee has reported that the Draw function in BatchedElements.cpp can set the OrthoZoomFactor (not a local variable) to 1.0f if Line.bScreenSpace is ever found to be false. The line this can oc ...
Content Examples: Blueprints_Overview Stand 1.7 Spark particle system does not fire from coin
Docs - Samples - Jan 19, 2017During runtime, the red coin in Stand 1.7 on the Blueprints_Overview map of Content Examples should emit a large spark particle system 5 times. While investigating, I tried disabling "Use Fixed Rel ...
Deleting a large number of unused variables from blueprints forces desktop to windows 7 basic mode until editor is closed
UE - Gameplay - Blueprint - Mar 30, 2015Deleting a large number of unused variables from a blueprint forces the editor into windows 7 basic mode until the editor is closed. ...
GetAllocatedSize returns inaccurate number of bytes
UE - Foundation - Core - May 20, 2015When calling GetAllocatedSize() on a TBitArray it will round down the result of MaxBits / NumBitsPerDWORD. This means that not enough bytes are allocated when the MaxBits is not divisible by NumBi ...
Xcode 8.3.2 fails to successfully build 4.15.1 from source code
UE - Platform - Apple - May 2, 2017Attempting to build 4.15.1 from source code using Xcode 8.3.2 currently results in the build failing due to warnings that occur in fbxsdk, AlembicImporter, and MetalRHI. ...
Importing skeletal meshes with uniform scale >1 causes rotation in skeletal mesh editor to improperly register
OLD - Anim - May 11, 2015If a skeletal mesh is imported with a uniform scale of >1, the rotation feature in Persona will not rotate bones at the proper ratio. The meshes rotation will slow down as the uniform scale increase ...
Skeletal Meshes do not work properly on Open GL ES 3.1 on Xiaomi Redmi 6
UE - Platform - Mobile - Oct 30, 2018Skeletal meshes do not render or animate properly on the Xiaomi Redmi 6 (PowerVR GE8320) when using OpenGL ES3.1. This issue changed a bit from 4.19 to 4.20. In 4.19, the skeletal mesh seems to of ...
A partially broken Geometry Collection ends up with garbage CollisionGroup data that can lead to strange behaviors
UE - Runtime - Deformable - Apr 27, 2025A partially broken Geometry Collection (GC) ends up with garbage CollisionGroup data that can lead to strange behaviors. The licensee has noticed that a GC that goes thru a field applying ExternalS ...
Custom Render Passes in Sequencer and High Res Screenshots are rendered incorrectly in HDR with DX12 and r.PostProcessingColorFormat=1
UE - Graphics Features - Jul 16, 2019Buffer visualizations rendered in HDR through the high res screenshot tool or sequencer using DX12 and r.postprocessingcolorformat 1 will result in renders that only capture the first row of pixels. ...
The crash reporter tool does not start on Windows 8.1 machines when running the Engine built from source code.
UE - Foundation - Core - Dec 5, 2014The source code to build the Engine that is available from GitHub includes the file dbghelp.dll, which prevents the crash reporter tool from starting on Windows 8.1 machines. This file is not presen ...