Unreal Engine Issues
Unreal Engine Issues
Material expression "FloatToUInt" can trigger a check() when input is invalid
UE - Rendering - Architecture - Materials - Mar 11, 2026When a "Float to UInt" Expression is used in a Material Graph with a valid direct input connection that fails to evaluate, function UMaterialExpressionFloatToUInt::Compile() does not catch the input ...
Nanite Skeletal Mesh ignores Hidden Material Section flag
UE - Rendering - Features - Nanite - Mar 11, 2026Unlike non-Nanite Skeletal Meshes, Nanite-enabled Skeletal Meshes do not correctly respond to the Show flag passed via ShowMaterialSection(). Consequently, the Isolate checkbox for material slots in ...
Rare crash when changing scalability settings rapidly
UE - Rendering - Architecture - RHI - Mar 10, 2026It seems like the code in RefreshSamplerStatesCallback() can overlap with FillUniformBuffer when it mutates the Wrap_WorldGroupSettings and Clamp_WorldGroupSettings FSharedSamplerState objects. Addi ...
Nanite culling breaks on scaled object with displacement when camera enters displacement area
UE - Rendering - Graphics Features - Nanite - Mar 9, 2026Nanite tessellation, only supports calculating displacement in local space and everything gets scaled with the object scale, which is often undesirable. If the camera enters inside the area allocate ...
Clicking on the timeline to move the playhead of the Persona animation viewer does not move the playhead.
UE - Runtime - Animation - Mar 6, 2026Scrubbing is the only way to move the playhead. ...
Inherited component properties on actor instances of derived blueprints are silently reset to defaults when the blueprint enters a compile error state and is subsequently fixed
UE - Framework - Blueprint Compiler - Mar 6, 2026When an instance of a child blueprint in a level enters the “Bad Blueprint” state due to a compile error it will reset to default values when it is restored after the compile error has been fixed. ...
Having a block in layout before switching to overlay strategy affects the overlay output.
UE - Anim - Mutable - Mar 5, 2026Issue: If "Resizable" Layout Strategy contains a block, it will influence the "Overlay" Layout Strategy. Expected behavior: When using "Overlay" Layout Strategy, it should disregard whatever the "R ...
StateTree: While editing State Parameters or exposed properties of a Condition/Task, an ensure() fires when editing inputs of a Property Function bound to an array element
UE - AI - StateTree - Mar 5, 2026Consider an array property that can be edited in the StateTree editor. This can be a State Parameter or an exposed property of a Condition or Task, for example. Each element of the array can be boun ...
Clear coat bottom normal does not seem to work properly with virtual textures
UE - Rendering - Graphics Features - Feb 26, 2026Clear coat bottom normal does not seem to work properly with virtual textures. Different virtual textures plugged into the material's base color can yield different clearcoat bottom normal results. ...
STAT_StaticMeshTotalMemory increases after repeated loading and unloading of a level containing Nanite static meshes
UE - Rendering - Graphics Features - Nanite - Feb 26, 2026The issue appears to be caused by a mismatch in the value returned by GetResourceSizeBytes(EResourceSizeMode::Exclusive) between InitResources() and ReleaseResources(). At InitResources(), the repo ...