0
$\begingroup$

I have problem with my height map. I plan to create a relief map using digital elevation model (DEM), which I will be able to print on A2 paper. I have DEM 10m (42 692 x 20 429 px) and in QGIS I clip this map to get my area of interest. Then I rescale map to get elevation range from 0 to 65 535 and save it as 16-bit unsigned TIFF. So in blender I used this .tiff file (4 860 x 3 690 px):

https://drive.google.com/file/d/1k_Vowyp6-5OrtIx-G1bB4y-U3WiShJi5/view?usp=sharing

In Blender Im using Cycles render engine.

Adaptive subdivision:

enter image description here

And for displacement:

enter image description here

enter image description here

Here's my render result (test with 200 samples, 4 860 x 3 690 px):

enter image description here

As you can see, the result have strange "terrace and grid":

enter image description here enter image description here

The result is worse when I use "displacement and bump" then when I use "displacement only". Also choosing another then sRGB color space make the result even worse. I tried to change texture interpolation and the best result I get with cubic but still there are visible "terraces".

It is possible to get rid of it or I have just bad quality height map (DEM)? I'll be glad for any advice. Thank you!

My blend file:

$\endgroup$
6
  • $\begingroup$ Can you show us where on your map these artefacts occur? $\endgroup$
    – eezacque
    Commented Jan 30, 2022 at 16:54
  • $\begingroup$ Everywhere... I think it doesn't depends on for example height, they occur on whole map $\endgroup$
    – Filip
    Commented Jan 30, 2022 at 18:45
  • $\begingroup$ I don't have the resources to render this efficiently, but my guess is these are compression artefacts. Your output format is png with 15%, does your png have the same issue? Can you render with no compression? If your final goal is to render the same straight down view, I suggest you use a bump map, as I don't think displacement is worth the trouble here. $\endgroup$
    – eezacque
    Commented Jan 30, 2022 at 19:58
  • $\begingroup$ In addition, make sure you set your output to 16 bit colors. $\endgroup$
    – eezacque
    Commented Jan 31, 2022 at 12:36
  • $\begingroup$ @eezacque thank you for your help $\endgroup$
    – Filip
    Commented Jan 31, 2022 at 15:58

0

You must log in to answer this question.

Browse other questions tagged .