Unreal Engine Issues

No easy way to disable a sense in AI perception

LIVE: Memory spikes when importing a json with a large amount of sprites

While importing a json file with a large amount of sprites, memory usage spikes. The test asset uses a 2000x128 texture with 1024 elements. ...

Memory spikes when changing properties on a large amount of textures via Property Matrix

When changing a property on a large number of textures via the Property Matrix, memory usage can spike to over 26G. Tested in Main (Promotable-CL-2423505) Probably related to [Link Removed] ...

MaterialInterface is not exported and therefore it's functions are not accessible

MaterialInterface which is a base class for other classes (such as UMaterialInstanceDynamic) is not being exported which causes compiler errors when a user attempts to access the functions of this c ...

HZB Setup Mips taking considerable time in GPU Visualizer

HZB Setup Mips in the GPU Visualizer seems to be taking considerable ms in 4.12 and 4.13 compared to 4.11.2. This seems to mostly affect editor/PIE GPU Visualization but looks like it should when ...

Console Command `Stat SceneRendering` is showing incorrect number of Lights in scene

When using the Console Command for Stat SceneRendering the Counter section for "Lights in scene" is not accurately listing the number of lights. In a 4.10 project an empty new level is showing 16 ...

Editor windows that contain viewports cause large framerate loss

When editor windows are opened that contain a viewport of some sort, the framerate of the engine drops drastically. Examples include the Blueprint Editor, Material Editor, and Persona. The viewport ...

Gear VR appears Choppy when add Widget components to the scene

Gear VR appears Choppy when add Widget components to the scene (this issue was not present in earlier version of the engine in the same project (4.16 appears to be a regression for 4.17)) Note: The ...

ComponentSweepMulti returning incomplete HitResults

ComponentSweepMulti sweeps each shape of a component, however resets OutHits at the start of a new shape, losing the prior hits, only returning the hits of the last shape swept. This is a regressio ...

Windowed fullscreen doesn't respect vsync settings

When running in windowed fullscreen mode in a standalone build r.vsync 0 is not respected and the game always runs at a locked 60fps. When the game doesn't have focus, for instance when you press Wi ...