PostProcessHMD not working with MobileHDR disabled

Unreal Engine Platform & Builds XR Development
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#1

I’m making a VR plugin for mobile HMD. The function DrawDistortionMesh_RenderThread not called when MobileHDR disabled. But some project may not want to use MobileHDR for better FPS.

I have checked the souce code. It’s because when MobileHDR disabled the bGammaSpace in FForwardShadingSceneRenderer::Render will be TRUE. Thus it won’t call the whole PosetProcess function GPostProcessing.ProcessES2.

Is it a bug for disable MobileHDR also disable the PostProcessHMD?

#2

Hi Jason.C,

ES2 will disable a lot of the post process settings. Mobile has a separate code path that accounts for various things.

You can read more specifically about this in the Post Process Effects on Mobile Platforms page.

#3

Thanks for your answer!

The problem is disable MobileHDR will also disable HeadMountedDisplay. Enable MobileHDR is OK. But I want to play with HeadMountedDisplay without MobileHDR.