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Ray traced DF shadow black line artifact on landscape

For some reason ray traced distance field shadows produce this weird black line along the termination distance of the shadows. It doesn't seem to be affected by either skylight nor the dominant directional light settings, other than the directional light's DF distance setting.

With DF shadows: http://i.imgur.com/5VvZjUB.png

Without DF shadows: http://i.imgur.com/mAFKex1.png

Product Version: UE 4.16
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asked May 26 '17 at 03:24 PM in Bug Reports

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avatar image jonimake Feb 11 '18 at 08:55 AM

This is still a problem in 4.18.




Edit: I just noticed that it's somehow related to the far shadows. Far shadow cascade amount is at 1 and setting it to 0 causes the problem to disappear. Increasing cascade count to 2 helps too somewhat, but it's still there.

Edit 2: From a shallow angle (as in when you're standing on the landscape) the problem persists even without far shadows. From a high angle it disappears if I turn off far shadows.

Edit 3: There are also black outlines on landscape against sky and landscape geometry that occur after the distance of the DF shadows:

https://i.imgur.com/R9PMxEs.png vs https://i.imgur.com/Z8gAptj.png

avatar image jonimake Jul 09 '18 at 03:05 PM

Right, still a problem and I think it's somehow related to the fact that distance fields aren't ran at full resolution. If I use r.DFFullResolution 1 the problem goes away but performance tanks quite a bit.

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