Particle Mesh Emitters Cause Heavy FPS Stutter

Rendering - May 4, 2018

Per User: After updating my project from 4.18 to 4.19, I started getting huge FPS drops at regular intervals. I managed to trace back the issue to particle systems with mesh emitters and could repr ...

UMaterialBillboardComponent Memory Leak and Hitching (Unreal 4.19.2 + 4.19.1)

Rendering - May 4, 2018

Creating an actor with a UMaterialBillboardComponent causes Editor hitching. ...

Sequencer does not support Quaternion Rotation when manipulating transform tools or piloting cameras

Sequencer - Oct 16, 2015

Noticing an issue when keying a camera and then playing back the animation it turns or spins in directions i never intended. Think we need check box for toggling Use Quaternion linear interpolation ...

Preformance drop when calling draw to render target

Rendering - Jun 19, 2018

There is a major performance drop after 4.18 when calling draw material to render target. This is an issue reported by many community members, and there seem to be additional reports with different ...

Unable to build a local installed build of the Engine with only VS 2017

Core - Oct 17, 2017

I was unable to reproduce this locally, but a licensee reported having trouble creating a local installed build of the Engine with only Visual Studio 2017 installed. The licensee reported that the S ...

Interface with one or more BlueprintNativeEvent declarations will lead to a compile failure during packaging with Blueprint nativization enabled.

Gameplay - Blueprint - Nov 14, 2017

In the UHT boilerplate that's generated for the FGUseableInterface type, there is a pure virtual declaration that's emitted for the BlueprintNativeEvent's required _Implementation() method: #define ...

When updating stats on a Steam leaderboard, the only option currently available is to add the new value to the old value.

Online - OSS - Steam - Dec 23, 2015

When trying to update a Steam leaderboard, the source code currently adds the new value to the old value instead of replacing the old value with the new value. This works fine for something like a T ...

Compile 'Note' on BP Interface events

Gameplay - Feb 23, 2017

Compile 'Note' on BP Interface events. It happens in actor BPs and also BP Widgets. A similar issue was fixed back in 4.11 with Custom Events. Could be related? https://jira.it.epicgames.net/brows ...

VR PIE with Oculus - Editor Hangs on Level Load (on 2nd+ Launch)

Virtual Reality - Feb 9, 2018

Loading a map while in VR PIE hangs on 2nd+ play Does not occur when Oculus plugin is disabled. Does not occur in packaged project. A nonVR PIE will reset this behavior. Additional info from use ...

Nativized build will crash on load if a member variable in a nativized parent Blueprint class references a non-nativized child Blueprint class asset.

Gameplay - Blueprint - Aug 9, 2017

This occurs because there exists a circular reference between the nativized parent BP and the non-nativized child BP asset (which is a data-only Blueprint in this case). Current suggested workaroun ...