Particle Lights do not honor Lighting Channel assignments

UE - Niagara - Jul 15, 2016

Particle system light's module does not use Lighting Channels. The particle system itself will accept lighting from it's assigned lighting channels but the lights spawned from the particle system, n ...

Changing Physical Surface Name and Reassigning It From Default Value Crashes

UE - Simulation - Physics - Oct 18, 2016

Changing the name of a physical surface that has already been applied to a physical material will cause a crash, if you try to reapply the renamed physical material from default. The physical materi ...

Set Sound Mix Class Override still Playing Sounds in Certain Conditions

UE - Audio - Oct 7, 2016

When using the Set Sound Mix Class Override within blueprints, the playback of any subsequent sounds seems offset or incorrect. This is apparent when using a Delay node. ...

Removing and replacing an Atmospheric fog causes hard line issue in SkySphere

UE - Graphics Features - Dec 28, 2015

When deleting and replacing the atmospheric fog with another atmospheric fog there will be a noticeable artifact near the sun disc from the SkySphere. Image attached. Tested in 4.11 stream CL-28 ...

Forward Rendering with Metal is stretched on iOS

UE - Platform - Mobile - Aug 19, 2015

When you turn off 'Supports Open GLES2' from the iOS settings and package a game with 'Support Forward Rendering with Metal (A7 and up devices)' the textures/materials are stretched across the objec ...

Reimport for a single FBX with multiple meshes will add all mesh pieces instead of the single mesh.

Tools - Nov 21, 2016

When using a single FBX with multiple meshes that is imported as individual meshes, if you reimport after updating only a single mesh or a few of them the entirety of FBX will be imported and added ...

CDO is not properly updated on Hot Reload causing "ghost" code.

UE - Foundation - Cpp Tools - Hot Reload - Jan 10, 2017

When a hot reload is preformed, the CDO is not properly cleared. This causes a copy of the class to be generated with both the original and copy triggering calls. Workaround: Preforming an additio ...

Material Reroute nodes do not work for Texture Object Parameters

UE - Rendering - Architecture - Materials - Mar 31, 2017

The reroute node is throwing an error why you try to using it with a Texture Object Parameter. It works just fine without the reroute node so the workaround is simple enough. ...

Material Preview for Post Process Material Does not display in Material Editor

UE - Graphics Features - May 19, 2017

In the Material editor for when working with a Post Process Material, the material does not appear in the preview window. Regression: This issue does not occur in 4.15.2 Binary Builds ...

Material Editor Tooltips for Sine and Cosine Expressions are Incorrect

UE - Rendering - Architecture - Materials - Dec 11, 2017

The tool tips for Sin and Cosine within the material editor need to be modified. The tool tips are inconsistent and do not match the information in official documentation. [Link Removed] ...