Comment by schnautzi

There are tricks to do it, I described some at the end of this blog post: https://jobtalle.com/layered_voxel_rendering.html

- If you raise all height values to a power, you get creases in the terrain that are generated by erosion in real life.

- If you raise all terrain values under a height just above sea level to a power, then you get beach like erosion, so flat areas will form along the shore.