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4.18 + forward rendering + HTC vive - blurry antialiasing

Hi Everybody,

We are actually testing the new version of UE 4.18.

We converted one of our existing VR project and noticed the antialiasing in our HTC Vive changed a lot.

In 4.17, when using forward rendering + MSAA, we have a nice, crisp antialiasing.

In 4.18, with the same scene and same settings the aliasing looks blurry and incorrect.

As an example, it looks the same as when you use defered rendering + Temporal AA with an HTC Vive.

Did someone else has the same problem ? Maybe we missed something ...

Of course we tried to reverse to deferred then reactivate forward rendering among other tests in order to be sure we identify the problem.

Best regards

Product Version: UE 4.18
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asked Oct 31 '17 at 10:47 AM in VR

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avatar image liquidpza Oct 31 '17 at 07:01 PM

I'm having the same issues, I'll let you know if I find a solution.

avatar image cs2010 Oct 31 '17 at 07:39 PM

At least I'm not alone ^^ Let's investigate ;)

avatar image unrealaaron Nov 08 '17 at 10:09 AM

I´m having similar problems. It seems to me that the supersampling in SteamVR has no effect on 4.18. When I run the same project on 4.17 the supersampling is applied. Sadly I don't have any solution for this yet.

avatar image cs2010 Nov 08 '17 at 10:32 AM

Very interesting. For short, do you think it has to be corrected by Epic or Steam ? I'm pretty confident if the problem comes from UE, it will be solved in the next update ...

avatar image unrealaaron Nov 08 '17 at 10:47 AM

I don´t know who should fix it. Hopefully it gets done somehow :)

I did try around with the r.screenpercentage command and achieved the same kind of effect. What I don´t know if this has a bigger or smaller performance impact. It seems like it is more costly but maybe I'm imagining.

avatar image darinsmyth Jan 08 '18 at 06:47 PM

Anybody any update on this? I seem to be getting blurryness with Vive and 4.18.2

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I've been using an Execute Console Command in the level blueprint and running an r.screenpercentage 200 command. Of course you can adjust the 200 and find a percentage that works well for you. This seems to be a solid work-around until it's fixed in an update. I hope this works for everyone, good luck in there!

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answered Jan 08 '18 at 11:51 PM

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avatar image Alex O ♦♦ STAFF Jan 12 '18 at 08:20 PM

"+1" for this workaround. Sounds like things will be cleared up in 4.19.


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