I have this terrain mesh with some mountains, but also some plains between the mountains.


I would like to smooth out the plains, because when 3D printed they cause a lot of unnecessary walls:


Basically if you'd represent this as an image with white = high and black = low, I'd like to blur the image.

I tried the "Smooth Laplacian" modifier which does nothing and the "Smooth" modifier which does this:


  • $\begingroup$ Try the Smooth command in edit mode in 2.79 hit W, in 2.8 hit Ctrl+v. Or use the smooth sculpt brush in sculpt mode. $\endgroup$ – FFeller Aug 9 '19 at 17:20

Apparently there was something wrong with my mesh (although it looked completely fine in edit mode). I activated the Mesh: 3D Print Toolbox add-on and then used the Make Manifold button on my mesh. After that all the smoothing tools (Smooth modifier, Smooth sculpt brush) began to work properly.

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