ViewExtension Postprocessing with split screen

Development Rendering
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1

Hi,

Subscribe to a postprocessing pass in a view extension break split screen.

void FTestViewExtension::SubscribeToPostProcessingPass(EPostProcessingPass Pass, const FSceneView & InView, FPostProcessingPassDelegateArray & InOutPassCallbacks, bool bIsPassEnabled)
{
    if (Pass == EPostProcessingPass::Tonemap)
    {
        InOutPassCallbacks.Add(FAfterPassCallbackDelegate::CreateRaw(this, &FTestViewExtension::TestPostProcessPass_RenderThread));
    }
}

FScreenPassTexture FTestViewExtension::TestPostProcessPass_RenderThread(FRDGBuilder & GraphBuilder, const FSceneView & View, const FPostProcessMaterialInputs & Inputs)
{
    return Inputs.ReturnUntouchedSceneColorForPostProcessing(GraphBuilder);
}

This empty pass seem to put all players views on the first player split.

See this screenshot :

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How can I add a post-processing pass without breaking the split screen?

Best regards,

Jérémy

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2

Steps to Reproduce
Minimal project to observe the issue :

https://github.com/jealvcim/ViewExtension\_TestPostProcess

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3

Hi,

thanks for the repro scene. According to [this UDN [Content removed] the issue disappears by setting ShowFlag.Temporal to 0 and then to 2 again (please let me know if this works on your end as well). I’m still investigating if this is a known bug, if not I’ll file a bug report.

Edit: updated missing link

Thanks,

Sam

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4

Hi,

After some more investigation, hooking into EPostProcessingPass::MotionBlur instead of EPostProcessingPass::Tonemap brings the image back. It should return a valid SceneColor for all player views.

Does this work for your use case?

These cases might be relevant as well:

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Sam

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5

Hi,

Thank you for your replies. ShowFlag and EPostProcessingPass::MotionBlur, both of your solutions work.

Jérémy

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6

Good to hear. I’ll close this case, but feel free to reopen if you have further questions.

Best,

Sam

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