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I am trying to do some Moon renders using NASA's CGI Moon Kit: https://svs.gsfc.nasa.gov/4720

enter image description here

Said kit has super high-res color and displacement textures (27000x13000), but this is what I'm getting up close:

enter image description here

Is there a way to smooth it out? Even though a 27k displacement texture which weighs 1,06 GB shouldn't even look like that in the first place...

Shade Smooth is (of course) enabled. Auto Smooth is off. I tried adding a bunch of Subdivision Surface modifiers, but they didn't help at all. Someone said I should use Adaptive Subdivision, but I couldn't find it in the Subdivision Surface modifier panel. I also tried plugging the same displacement texture in the Normal input of the Principled BSDF through a Bump node, but the result was even worse.

Please help me!

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  • $\begingroup$ What is your setup for displacement? Share your blend without textures. $\endgroup$
    – vklidu
    Jan 15 at 8:43
  • $\begingroup$ Here it is: we.tl/t-2A6J5PDq3s $\endgroup$ Jan 15 at 8:53
  • $\begingroup$ These lines are visible also on the original displace texture. $\endgroup$
    – vklidu
    Jan 15 at 10:08
  • $\begingroup$ Looks like the interpolation between pixels is off. In the image texture node of your material if your interpolation mode is set to "Closest" try out another mode (Smart or Cubic) $\endgroup$
    – Gorgious
    Jan 15 at 10:43
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These lines are visible also in the original texture. So to get rid of this you would have to use some image editor to compensate it. Here I used Photoshop's Box Blur filter with range 1 px that wasn't enough so I used it twice, but you loose some details.

Original enter image description here

Box Blur 1 px enter image description here

Box Blur 1 px applied twice enter image description here


There are probably better algorithms for reconstruction or pattern removal like some FFT Fast - Fourier Transform (they are like a magic in some cases) ... so here are some examples

Ten years ago I used some FFT script for Photoshop, but it is too far to remember anything, sorry :)

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  • $\begingroup$ Hey, thank you so much for the answer! Where do you see the lines? I opened both textures but I can't see them at all. svs.gsfc.nasa.gov/4720 $\endgroup$ Jan 15 at 11:09
  • $\begingroup$ In the original texture are lines in vertical direction imgur.com/VWPgCv6 They aren't so clearly visible as in render because they are not shaded. These displacement B&W images with high bit-depth consists visually from a small steps in grey color that produce a "big" step in elevation to be able cover whole range of high transformed into greyscale, but I think you can see them if adjust image Exposure. $\endgroup$
    – vklidu
    Jan 15 at 11:18
  • $\begingroup$ Oh I see... could it also be an interpolation issue, as Gorgious said? $\endgroup$ Jan 15 at 11:23
  • $\begingroup$ You can try it by your self :) What I tried - NO. Interpolation is set to Linear, it is not off and others doesn't help either in this kind of zoom. $\endgroup$
    – vklidu
    Jan 15 at 11:29
  • $\begingroup$ Okay! I'll try Box Blur then, thank you! $\endgroup$ Jan 15 at 11:30

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