Unreal Engine Issues
Unreal Engine Issues
Misalignment between meshes used in landscape spline segments
UE - Graphics Tools - Terrain - Dec 17, 2024When using a landscape spline with multiple segments, there can be misalignment between spline segments when the tangent length of segments are too short, causing visual seams between meshes that sh ...
Virtual Shadow Maps on Spot Lights cause a blocky presentation similar to an incorrect mip level
UE - Graphics Features - Shadows - May 26, 2025Spot Lights may present with very blocky shadow artefacts when a long attentuation radius is provided with a small cone angle. In extreme cases, this causes the VSMs to invalidate every frame. Notab ...
Frame rate issues using Fixed Frame Rate and Matinee
Tools - Aug 10, 2016Frame rate issues using Fixed Frame Rate and Matinee. This could be similar to some issues involving "Force Fixed Frame Rate". ...
Custom events with a struct that has had its pin split will throw an error when adding variables to the blueprint
UE - Gameplay - Blueprint - Aug 26, 2016Custom events with a struct that has had its pin split will throw an error when adding variables to the blueprint. The Struct appears to throw an error when making changes that are seemingly unrelat ...
Copy and Pasting the Value for a Vector3 Parameter causes Color Picker to Stretch Across screen
UE - Rendering Architecture - Materials - Nov 17, 2016When copying the 'Value' of a color from the color picker within the material editor, and pasting it into the value field of a new color picker dialog window, it stretches across the screen and caus ...
.mp4 videos are not playing on certain mobile devices
Media Framework - Nov 14, 2016When launching a project with a video in it on an Android or iOS device, it either will work or it will not work. I believe this is due to the OS version of the device, but it may be related to the ...
Mac OSX Shader compiling crash When Editor Launched from Symlink
UE - Platform - Apple - Nov 10, 2016When the editor is launched via Symlink on a Mac, the Material Editor will crash when compiling or when building lighting on a level. This does not occur if the editor is launched from an external d ...
Unable to compile Engine for Debug Editor when bDebugBuildsActuallyUseDebugCRT is set to true
UE - Foundation - Cpp Tools - UnrealBuildTool - Feb 10, 2016When building the source for the engine in Visual Studio 2015, if bDebugBuildsActuallyUseDebugCRT is set to true and the build configuration is Debug Editor, the build will fail. Full output log fr ...
Debug symbols are required for the Shipping packaging configuration
Tools - Feb 11, 2016If the engine is installed without the Debug Symbols, packaging for Shipping will fail due to the missing files. While I believe this is expected for Development, it shouldn't occur with shipping. ...
Upgrading Project After Disabling Light PropagationVolume Plugin Causes Crash
UE - Foundation - Cpp Tools - Plugin System - Apr 1, 2016Attempting to upgrade a project from 4.10 to 4.11, or 4.11 to 4.12 with the LightPropagationVolume plugin disabled causes it to crash. Found in converting a 4.10 project to 4.11, and reproduced con ...