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stupid shadow artefacts on nanite landscape

poopipe
grand marshal polycounter
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poopipe grand marshal polycounter


wtf is this and how do I make it go away? 
(it is not the thing with a solution in the video you just thought of)

UE 5.3.2
Hardware raytracing is disabled (which is why its not the thing in the aforementioned video)
Lumen is enabled
Landscape is nanite
Virtual shadow maps are enabled

It goes away when the landscape is not nanite (not an option, this is a world partition world and the map is quite large)

ta:)

Replies

  • Alex_J
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    Alex_J grand marshal polycounter
    just a guess, but contact shadows is turned off?
  • poopipe
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    poopipe grand marshal polycounter
    yep. 

    to add.. 
    Behaviour appears to change in synch with mips in the virtual shadow map - there is actually a distance where the artefact isn't visible. 
    The patterning of the artefact does look similar to the artefacts you get with two sided ray-traced shadows on nanite objects 


  • iam717
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    iam717 greentooth
    The comments here might turn up some solution. (not many)
    i looked a bit gave up. :)
    Your recent post eliminated this solution:
    i might spam vid links with possible "solutions"

  • poopipe
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    poopipe grand marshal polycounter
    yeah - the first one isn't a bad shout but this is exclusive to nanite landscapes (watched the video with no sound so may have missed something.  I suspect it's got something to do with the geomegrty it chooses for shadows at a given mip as it only really appears  where the landscape has fairly high rate changes of direction. 

    I'm gonna ignore it for the time being  - I've spent most of the last year trying to get a performant (and practical) solution to large world partition worlds working in 5 and  i just don't have the heart to start fighting with the renderer at the moment :D
  • Ghogiel
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    Ghogiel greentooth
    Any development on this issue?  I'm at a new studio and they have exactly the same issue. 

    Nanite landscape and HW raytracing off.  I initially thought raytraced shadows but it can't be. 

    To be fair, the current prototype doesn't even make use of nanite properly on terrain so it's just looking ugly for no reason. Except maybe something performance wise where the way nanite renders and shadows helps in that department, but I doubt it.  
  • poopipe
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    poopipe grand marshal polycounter
    development..?
    Ignoring it has been a pretty effective strategy so far - I dont notice once there's grass and stuff 


    Barring that artefact I haven't seen nanite landscapes do anything they shouldn't in terms of how the shadows look.  They do plenty of other things they shouldn't - like not load in PIE or not load in packaged builds unless you perform a set of weird rituals first - but visually they've been fine and certainly run better than the standard landscapes
  • Ghogiel
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    Ghogiel greentooth
    Alright thanks. Yeah, grass etc covers most of it but then the paths on the landscape are terrain. Some areas,  totally jacked with a bunch of artifacts other areas nothing massively distracting is happening 


  • poopipe
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    poopipe grand marshal polycounter
    that looks pretty rough :(  My feeling is that it has to be a bug rather than a wrong setting so i'm hoping it'll come out in the wash. 
    I've not checked whether it's improved on 5.4 as i don't have the emotional strength for another engine bump at the moment
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