lots of wasted Volumetric lightmap samples

UE - Graphics Features - Lumen - Jun 20, 2019

Expectations: The samples should only surround the lightmass importance volumes.  Imagine if we build a 8K*8K map with lightmap importance volume at the corners of the map, even using stream levels ...

Linked animation graph doesn't trigger anim notifications on dedicated server.

OLD - Anim - Jun 15, 2020

Linked animation graph doesn't trigger anim notifications on dedicated server. There is no expected message in log: LogBlueprintUserMessages: [HitReact_AnimBP_C_0] Client 0: HitNotify IsServer: tru ...

AnimNotifyState with the same class, but different content at the same time will only one be triggred

UE - Anim - Runtime - Oct 26, 2022

UDN Case : https://udn.unrealengine.com/s/question/0D54z00008G3EmwCAF/two-c-based-animnotifystate-with-the-same-class-but-different-content-at-the-same-time-will-only-one-be-triggred?fromCase=1 ...

Issues converting enum to byte in BP

UE - Gameplay - Blueprint - Sep 8, 2015

User experienced unexpected AI behavior and was kind enough to share a stripped down version of the project. I was able to nail down issues user was experiencing to failed enum-to-byte conversion. U ...

[CrashReport] UE4Editor_Core!FModuleManager::UnloadModule() [modulemanager.cpp:557]

UE - Foundation - Core - Feb 27, 2017

Error message: Assertion failed: ModuleInfo.Module.IsUnique() [Link Removed] [Line: 557] Source Context: Most recent user affected CL: Logs: See attached Issue call stack shares some similariti ...

Add material API to python

UE - LD & Modeling - Modeling Tools - Mesh Editing - Jan 20, 2020

UDN ask to control mesh materials in python script. The API is public but not expose. I suggest to add functionalities to the editor scripting utilities plugin for both static and skeletal meshes. ...

AI Perception Not Showing Up in Debugger

UE - AI - May 20, 2016

AI Perception does not seem to be showing up in the debugger. The same setup functioned as expected in 4.11.2 binary, but upon converting the project to 4.12 Preview 4 binary, no debug information w ...

[CrashReport] Fatal error: Cast of nullptr to Object failed

UE - Gameplay - Oct 5, 2017

This is a common and longstanding crash that has affected many users since at least 4.11. Source context not available (error in user code?). User DescriptionsI was duplicating a Set function in c ...

Rare assertion comes up when cooking if sequencer camera track has only additive transform track

UE - Anim - Sequencer - Mar 2, 2020

If a camera track has only additive transform track, some functions return uninitialized F3DTransformTrackToken made by default constructor. It causes a rare assertion. Please take a look at F3DTra ...

Ease node "Shortest Path" auto sets to true after closing and reopening editor

UE - Gameplay - Blueprint - Mar 9, 2015

UPDATE: 3/10/2015 User reported manually adding a separate boolean value causes that value to automatically switch to true upon reloading editor as well. No current workaround is available. ======= ...