Unreal Engine Issues
Unreal Engine Issues
HZB occlusion is broken on Instanced Stereo
UE - Platform - XR - Oct 2, 2025Other engine features requiring HZB data (such as per-instance GPU LOD selection occlusion culling or light grid culling) are also impacted regardless of whether r.HZBOcclusion is enabled. ...
Loss in Specularity on Skin Shading when Shadowed by Indirect Capsule Shadows using r.sss.checkerboard 0
UE - Graphics Features - May 23, 2017A licensee is reporting incorrect or over exaggerated loss of specularity on the Subsurface skin shading model when shadowed by indirect capsule shadows, and then modifying the r.sss.checkerboard se ...
Landscape Tutorial Missing a Word
Docs - Dec 9, 2019In the Landscape Tutorial Overview there is a word missing in the tutorial. ...
Running Lyra with a Startup Movie causes a crash
UE - AI Workflows - UI Systems - Slate - Jun 26, 2023Adding a startup movie to a Lyra Starter game project will cause a crash in a packaged build. Full callstack is attached ...
Volumetric fog flicker side screen
UE - Rendering - Architecture - Nov 29, 2023The flicker is visible in Epic scalability as well, it is just smaller on screen because the fog voxels are smaller (r.VolumetricFog.GridPixelSize). ...
TAssetPtrs are not properly fixed up in client PIE instances
Tools - Aug 18, 2015Contrary to the linked UDN question, this doesn't seem to require the actor to be replicated. The problem is that when UWorld::DuplicateWorldForPIE is called for a PIE client instance's persistent ...
Groom Assets do not cast shadows when the shadow casting light is close to the groom and virtual shadow maps are in use
UE - Rendering - Features - Mar 19, 2024When a shadow casting light is closer to the groom than some proportional amount the groom is away from the shadow catcher, the groom's shadow will disappear. This only occurs using VSMs. Raytraced ...
DoesSocketExist always returns false for Sprite Sockets (flipbooks and sprite components)
UE - Gameplay - Paper2D - Jan 15, 2015DoesSocketExist always returns false for Sprites in a Flipbook, whether there is a socket on any/all of the Sprites or not. Note: GetSocketLocation seems to work fine, indicating that it is reading ...
Potential wrong branch condition about DFAO and Niagara GPU SDF Collision
UE - Rendering - Architecture - Niagara - Mar 6, 2026Particles using Distance Field collision can have their collision controlled by "r.DistanceFieldAO". It appears that the condition in "ShouldPrepareGlobalDistanceField(...)" from DistanceFieldAmbie ...
Material Parameter Collection does not correctly render in Widget BP
UE - Editor - UI Systems - Feb 23, 2015If a Material Parameter Collection with a Scalar Parameter is used within a material and that material is called within a widget the scalar parameter will render with a 0 value, even when set to ano ...