Landscape Layer Blend generates bad code for preview shader

UE - LD & Modeling - Terrain - Landscape - Sep 23, 2019

It breaks only when compiling the preview shader. Adding a preview weight to the Layer0 on the Layer Blend node fixes the problem. The source of the bug is in UMaterialExpressionLandscapeLayerBlend ...

Cash when entering Path Tracing view mode if r.Decal.NormalReprojectionEnabled true

UE - Graphics Features - Path Tracer - May 16, 2025

Cash when entering Path Tracing view mode if r.Decal.NormalReprojectionEnabled true The licensee has reported: This crash happens because the DeferredShadingRenderer tries to extract the normal GBu ...

DataTable::LoadStructData allocating wrong size

UE - Foundation - Core - Oct 5, 2016

Pointed out by a licensee here: UDataTableを読みこんだ際のメモリ破壊について When reading the `UDataTable, in DataTable::LoadStructData()` the contents of the struct are interpreted[Image Removed], but the size of ...

Scaling snap for selected object are reset to the origin of the scale pivot location

Tools - Apr 27, 2016

When scaling multiple selected actors in the scene with snap enabled the actors will reposition to the pivot origin of the last selected actor in the group when going down to a value of 0 or a negat ...

UDN : Mutable Trying to Access Invalid UEdGraph Pointer

UE - Anim - Mutable - Mar 6, 2025

Hello, We've started seeing a crash within Mutable when it tries to access the source graph in PIE. This only seems to be a problem when running a dedicated server as a separate process. We integra ...

Manipulating Morph Target on Master Component distorts Slave Components

OLD - Anim - Apr 1, 2016

Manipulating Morph Targets on Master Component distorts Slave Components. It makes no difference if the slave component has the morph target being manipulated in the master See attached image and ...

Particle Cutout Will Clip Texture On Certain Frames Even With Alpha Threshold of 0.0001

UE - Niagara - Feb 17, 2017

A licensee has reported that the particle cutout feature will sometimes clip the image on some frames despite having an alpha threshold of 0.0001 The attached project has an example of this on the ...

Fbx importer can import valid under 30Hz anim at 30Hz

Tools - Jul 17, 2017

The samplerate of a track was compute with the following formula Equation 1: number of Key / animation Time This formula work only if we have animation keys that are time equidistant. example of ...

Surface Profile Skin shading has some unexpected stripe rendering issues

UE - Graphics Features - Apr 3, 2018

So it looks like the artifact is definitely related to whether sss checkboard is enabled, but I can't reproduce it if enabling checkboard right after open the map, I mean it has to be reproduced aft ...

Crash when saving a Data Table that is referencing itself in a Data Table Row Handle

Tools - Feb 23, 2017

Crash when saving a Data Table that is referencing itself in a Data Table Row Handle. Reopening the project also causes a crash. *Regression: Yes This was fixed and working in 4.13-3037605 This i ...