Unreal Engine Issues
Unreal Engine Issues
Missing info in GPU breadcrumbs and DRED logs
UE - Graphics Features - Apr 21, 2025Some breadcrumbs and D3D12 logs are missing data which should normally be filled in e.g. Breadcrumbs: > PostProcessMaterial %dx%d Material=%s [Active]. After investigating this, there seems to be a ...
Iris - large fast arrays serialize multiple elements when only one is dirtied
UE - Networking - Iris - Apr 8, 2025This seems to be a result of how the changemask is handled for fast arrays. Because the changemask is a fixed set of bits (defined by IrisFastArrayChangeMaskBits), a single bit can represent multipl ...
Overlay materials stop working when Show Collisions
UE - Simulation - Physics - Apr 7, 2025Overlay Materials are disabled when the Collision showflag is enabled. ...
Light function does not work with volumetric fog when not compatible with light atlas
UE - Graphics Features - Mar 28, 2025Light functions do not work as intended with volumetric fog when using clamped mask textures which are not compatible with the light function atlas. In light functions materials, when using any UV ...
Interchange static mesh import convert to reimport and fail to assign material changes.
UE - Editor - Content Pipeline - Import and Export - Mar 4, 2025Hello, When reimporting an FBX using interchange, the material are reapplied and we are stuck with the old properties. We are calling interchange by code, but we were able to repro by doing a reimp ...
D3D12 Does Not Correctly Validate Static Uniform Buffers Correctly
UE - Rendering Architecture - RHI - Feb 12, 2025When adding a Uniform Buffer Struct that has one 4x4 matrix to a mesh pass, validation will fail, due to a Uniform Buffer Struct mismatch. This can be reproduced by adding a mesh pass in project-si ...
World Position Offset Object Shadow Cast on Translucent Object Causes Flickering
UE - Graphics Features - Jan 21, 2025When a WPO (World Position Offset) object casts a shadow on a translucent object, the translucent object flickers continuously as the shadow passes over it. Initially logged as a 5.5/5.5.1 but also ...
Broken hair material with light function
UE - Graphics Features - Dec 19, 2024Hair Materials do not react to Light Functions in the same way as other Materials. There is a visual difference between a Directional Light at 1 lux with no Light Function and a Directional Light at ...
In UE5.5(final), when adding plugin from an older version of Unreal to a BP project, we are informed that the Engine Modules are out of date, and cannot be compiled while the engine is running. Please build through your IDE.
UE - Foundation - Cpp Tools - Nov 19, 2024In UE5.5(final), when adding plugin from an older version of Unreal to a BP project, we are informed that the "Engine Modules are out of date, and cannot be compiled while the engine is running. Ple ...
Direct Link is not finding source - macOS Sequoia
UE - Editor - Content Pipeline - Datasmith - Exporters - Nov 14, 2024Direct link with macOS Sequoia seems to be broken as Twinmotion cannot detect the Direct Link source, it seems the data is properly written in the cache directory. Update: Another user reports th ...