Unreal Engine Issues
Unreal Engine Issues
Opcode shader compilation error when using a TextureSampleParameterCubeArray node with hardware ray tracing enabled
UE - Graphics Features - Ray Tracing - Mar 31, 2025Materials containing a cube array texture sampling node will not compile when hardware ray tracing is enabled. The shader compilation error indicates that an invalid op code was used: "Opcode Sample ...
OverrideVertexColor causes a crash on mobile renderer
UE - Platform - Mobile - Jan 8, 2026Setting Allow CPU Access on the mesh, or setting bSupportsManualVertexFetch=1 in Engine.ini, avoids the crash. ...
Screen widgets with transparency are darker when displayed in an HTML5 environment
UE - Editor - UI Systems - Jun 8, 2015If the user creates a widget blueprint and adds an image with transparency the image will appear slightly darker when launched in HTML5 (firefox nightlie in this test) ...
Decal Fade Out does not cause decal to fade, destroys decal at end of fade time
UE - Graphics Features - Jul 27, 2016Decal Fade Out does not cause decal to fade as expected. Instead, after the delay and fade time, the actor is destroyed with no noticeable fade during this time period. ...
CircleDOF Creates Artifacts When Close to a Translucent Surface With an Object Behind It
UE - Graphics Features - Dec 19, 2018With CircleDOF enabled artifacts will occur when getting close to a translucent plane with an object behind it. This does not occur with any other DOF method or if "Render After DOF" is disabled in ...
Image widget not showing up when a material is applied and a text block is placed over it
UE - Editor - UI Systems - Nov 19, 2014If an image is added to a UMG widget with a material applied to it. It will no longer show up in the viewport if a text block is added to the same widget (above the material via the Zorder). ...
Custom Nav Area Not Affecting Nav Mesh Until Restart
UE - AI - May 2, 2016When using a Nav Modifier volume with a custom Nav Area class, the Nav Mesh is not being affected until the editor is restarted. Found in 4.11.2 binary. Reproduced in 4.12 Preview 1 binary and Main ...
Deleting a material layer from a stack, re-linking the layers, then deleting that layer again crashes the editor
UE - Graphics Features - Feb 5, 2021The important step here is to unlink the middle layer after first relinking everything. ...
Spot Lights are not using Light Propagation Volumes when enabled
UE - Graphics Features - May 23, 2016As of 4.9 Dynamic Indirect Lighting with Light Propagation Volumes should be supported for Spot Lights. This does not appear to be the case for several versions that I could see. Using the methods o ...