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I'm trying to make stylized topographic maps in cycles using displacement with 10m resolution hight maps. An early issue I have is getting clean edges. Adding more geometry to the plane does not seem to help. I suspect my image may be too low resolution, but that's the best I can find. Does anyone have a workaround suggestion to clean this up a bit? Many thanks.

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  • $\begingroup$ Hello, OpenEXR format seems to work better for height map, it may fix your problem? but maybe share your file with the image packed: blend-exchange.giantcowfilms.com $\endgroup$
    – moonboots
    Commented Nov 20, 2020 at 14:44
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    $\begingroup$ These "torn" shadows are a known issue when working with 90° angle displacements. You could try vector Displacement instead. Increasing the resolution of your image is a bit more tricky. However there is a plethora of external tools or options within Blender to interpolate values in between pixels, to get an image with increased resolution. That should help with the jagged edges. $\endgroup$
    – TheBeautifulOrc
    Commented Nov 20, 2020 at 14:47

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A couple of things come to my mind:

  • If it's really the image that's the problem, upscale and blur it beforehand. This will smooth any compression/resolution artifacts and could work in your case.
  • Are you using Adaptive Subdivision? If not, you might want to do that. Go to Render Properties > Feature Set > Experimental. Then add a Subdivision Surface modifier set to Simple and check Adaptive Subdivision. In viewport you won't see the full resolution though. Also, make sure to use Displacement Only. Material Settings > Settings > Surface > Displacement >Displacement Only.
  • Try different interpolations in the Image Texture node.
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