Reflection flickers 4.25 - 4.26, FIX

Hi guys,

here is interesting hack, that can be fixed

All reflections flickers like crazy in 4.25 version, its a fact. Reflections issue stopped / been fixed in latest 4.26 version, but all my projects are set up in 4.25 and convertion would damage them. Now, if I run 4.26 in same time as my 4.25 projects, all flickers stops / goes away / fixed. Once I leave 4.26 and keep 4.25 opened, flicker is back… wth.

BTW, you dont have to even close 4.26 to get flickering back, you can just open project settings in 4.25 and flickering is back even 4.26 is opened. That brought me an idea, solution below.

TemporalAA jitter doesnt fix anything.


go to Project Settings / Rendering /, and change Anti-Aliasing Method to TemporalAA

That will fix it. (Default is FXAA, broken)


****** HERE’S FLICKERING FIX *********************

Official 4.25 and 4.26 having some glitches in calculations, namely TemporalAAHistory structure was not filled out correctly

Here’s the only solution that will surely fix for both 4.25 and 4.26 versions (building from the source and fixing engine glitch), since 4.25 will not have any more updates and 4.26 also has the same issue:

  1. get Unreal 4.25 source, following link is a step by step instructions on how to get the source (no need for the building until you change buggy scripts, just when you get 4.25 source unzipped from git, run Setup.bat, after that **run GenerateProjectFiles.bat **): Building Unreal Engine 4 (UE4) From Source Code / GitHub - YouTube

  2. **change this 2 scripts **as explained in the below link, and finally, **build the source **…48f5a38dfb53ea

  3. compile your project from source (in the following link, instructions are around 8.50 min): Building Unreal Engine 4 (UE4) From Source Code / GitHub - YouTube

Enjoy again your UE4.25/26