How to enable and check support for VRS tier 2 in UE 5.4?

Development Rendering
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3

I was amazed that I’m not getting any VRS enabled as well in UE5.4.4 :slight_smile: . One of the problems is that I was trying to use 4x4 mode and surprise, my 7900 XT only goes to 2x2 so if you put 4x4 it’s going to revert to 1x1. Then the preview visualization was broken and I discovered the bug by analyzing UE source code ( I do that often :slight_smile: ). In case you’re wondering, it’s just one line at fault in VariableRateShadingImageManager.cpp line 649.

TStaticBlendState<CW_RGB, BO_Add, BF_SourceAlpha, BF_InverseSource1Alpha>::GetRHI();
//Needs to be replaced with
TStaticBlendState<CW_RGB, BO_Add, BF_SourceAlpha, BF_InverseSourceAlpha>::GetRHI();