ProxyLOD plugin generates uninitialized vertices at end of a vertex buffer

UE - World Creation - Worldbuilding Tools - HLOD - Sep 11, 2020

ProxyLOD::FQuadricMeshSimplifier::OutputMesh may remove duped verts. The input vertex buffer was resized by numVerts from FQuadricMeshSimplifier before calling OutputMesh. So these behaviors genera ...

Nativizing a blueprint interface using TMap/TSet causes Fatal error in UHT

UE - Gameplay - Blueprint Compiler - Sep 9, 2020

FPropertyBase constructor does not handle a TMap/TSet property. Following workaround can avoid this error. explicit FPropertyBase(FProperty* Property) : PropertyExportFlags(PROPEXPORT_Public) ...

Launching Android project to device results in Assertion Failed: AsyncLoading.cpp, Line 3710

UE - Platform - Mobile - Aug 31, 2020

After updating to 4.25.1 from 4.25 Packaged Android game crashes constantly with objects added to the map 4.25 Packaged game did not crash (editor did a lot but glad thats fixed in 4.25.1) Empty map ...

Functions containing Unicode characters break nativization on Clang-hosted target platforms.

UE - Gameplay - Blueprint - Sep 15, 2020

The UHT boilerplate code that's generated from a converted Blueprint class header file generated from a Blueprint class containing one or more function names with non-ASCII characters will fail to c ...

Crash occur when switching the Ray Tracing shadow function when only shadow is enabled in the Ray Tracing

UE - Graphics Features - Lumen - Sep 16, 2020

According to the licensee, this problem is caused by a variable inconsistency in Cvar. The cause seems to be the difference between the CVar reference when generating RayTracingSceneRHI and the CVa ...

Crash running construction script after compiling BP function library

UE - Gameplay - Blueprint - Sep 15, 2020

Editor can assert when changing the signature of an editor authored Blueprint Library Function (FuncA) if that function is called from a Blueprint Library Function (FuncB) via an actor's constructio ...

High Precision Tangent Basis & Use Full Precision UVs on Skeletal Meshes reset after reimport

UE - Editor - Content Pipeline - Datasmith - Importer - Sep 17, 2020

Reimporting a skeletal mesh causes "use high precision tangent basis" & "use full precision UVs" to reset and no longer being applied to the mesh. Reported and tested in version 4.25.3(CL 13942748) ...

Crash when quick binding a function in a class that extends LevelSequenceDirector

UE - Anim - Sequencer - Sep 16, 2020

The purpose was to create a Level Sequence Director inheritance class so that the same event could be reused in multiple sequencers. Attempting to quick-bind this base Level Sequence Director event ...

Selected Option in Switch Actor Doesn't show up in variant manager properties.

Tools - Sep 25, 2020

Selected Option is part of a Switch Actor property. When attempted to add the property in variant manager, the property named selected option doesn't show up in variant manager properties. Reported ...

[CrashReport] UE4Editor-D3D12RHI!static void SetRayTracingHitGroup(class FD3D12CommandContext & const, class FD3D12RayTracingShaderTable *,

UE - Rendering Architecture - RHI - Jul 14, 2020

Generated from CrashReporter Error Message: Unhandled Exception: EXCEPTION_ACCESS_VIOLATION reading address 0x00000088 User message (Aritzia_Bistro.log): datasmith re-import ...