Problem with displacement in high resolution render

[Sergiy Lysenko]

Folks need your help!

Sand dunes/waves on the ground are made with a displacement. When I am rendering it with a preview size (less then 2k) everything fine.
But on high resolution render 7k, displacement on the ground disappears. I've already tried to switch between displacement in px and world size (in render setting) but it does not change anything for me. What I'm doing wrong?

First image rendered in less then 2k
Second image rendered in 7k.

[Beanzvision]

Hi there, what is the displacement map you are using? Is it a texture or something procedural?

[Sergiy Lysenko]

Yep its a texture.

I have a pretty complicated scene with a lot of everything and full of high res textures, because of that my initial thoughts were maybe I don't have enough RAM to calculate it in high res. So I've sent it to render farm - but the result is the same.

[Beanzvision]

And what size is the texture you're working with?

[Sergiy Lysenko]

8k with a UVW Randomizer Shader

[Beanzvision]

Okay, thanks. Are you able to share a test scene with us to investigate further? If so, please feel free to use the link in my signature below. ;)

[Sergiy Lysenko]

Done, thanks in advance!

[TomG]

Best way to submit is to use that link, as you can attach files of any size when you "Submit a Request" (in that ticket, you can include the link to this forum thread, to complete the circle :) ).

[Beanzvision]

I think this might have something to do with scale. If I increase the displacement to something like -25 to 25cm's. It noticeably works.