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World Machine displacement edge artifacts

Posted: Tue Dec 06, 2016 3:08 pm
by scart
Hello there. Im using bunch of planes one to one with 4k displacement maps from world machine. Nice solution in terms of render time.
Though im getting strange artifacts on the edge of every tile, as on the pic im posting. It ruins the whole idea of building a big terrain out of tiles.
Same issue perstist if i'm converting the scene to standalone. Please help!

Re: World Machine displacement edge artifacts

Posted: Tue Dec 06, 2016 3:16 pm
by Bulwerk
What I find has helped is to scale all the image maps uniformly (including displacement) by a really small factor.
for example change from 1.0 to 1.001

It's so small that I did not notice the change when using tiles.

Re: World Machine displacement edge artifacts

Posted: Tue Dec 06, 2016 3:28 pm
by scart
Bulwerk wrote:What I find has helped is to scale all the image maps uniformly (including displacement) by a really small factor.
for example change from 1.0 to 1.001

It's so small that I did not notice the change when using tiles.
Unfortunately it is noticeable.

After some research I found that this is happening because tiling of the textures is on.
And I can't find how to disable this tiling.
Does anyone knows how to do it?

Re: World Machine displacement edge artifacts

Posted: Tue Dec 06, 2016 3:59 pm
by EOA
I would REALLY love to know this as well. Having the exact same issues! And I agree the scaling isn't ideal.

Re: World Machine displacement edge artifacts

Posted: Tue Dec 06, 2016 4:46 pm
by Bulwerk
Have you tried to change the "Boarder mode" setting on the image texture node?
Lots of setting there that might help.

Re: World Machine displacement edge artifacts

Posted: Tue Dec 06, 2016 5:07 pm
by scart
Bulwerk wrote:Have you tried to change the "Boarder mode" setting on the image texture node?
Lots of setting there that might help.
Displacement node rejects border mode in settings.

Re: World Machine displacement edge artifacts

Posted: Tue Dec 06, 2016 5:15 pm
by aoktar
Also why this is a problem if you make tiled terrains. Pikes will not be visible.
Also It's better to use displacement as a helper for details on lowres terrains. Not over a plane with high amount displacement.

Re: World Machine displacement edge artifacts

Posted: Tue Dec 06, 2016 6:26 pm
by scart
aoktar wrote:Also why this is a problem if you make tiled terrains. Pikes will not be visible.
Also It's better to use displacement as a helper for details on lowres terrains. Not over a plane with high amount displacement.
pikes are visible on tiled terrains, because each tile is a different material, beacuse 8k is maxres.

didn't really get the thing about displacement as a helper, can you please expand?

Re: World Machine displacement edge artifacts

Posted: Tue Dec 06, 2016 10:05 pm
by TonyBoy
I would use displacement to get correct outlines on objects of low polygon density. Normals are fine until you look at the edges.

Re: World Machine displacement edge artifacts

Posted: Tue Dec 06, 2016 10:31 pm
by EOA
I tried illustrating it in this scene file, https://we.tl/MS7Wm5UXYd the issue with the tiles and the glitching should be clear I hope. Can you please advice how to avoid these glitches on the edges of displacements in general? As shown also, I can get the glitch to go away by cropping the polygon a bit, but that solution is no good for tiles, because it removes the area on the edges from the displacement, from there I finally tried scaling the UV manually (...) but this doesn't seem able to get me to the final goal of seamless tiles of displacement.