Thomas de Groot wrote:

> The problem is still with the *flat* roofs. I guess I have to avoid
> steep slopes :-) at least for the time being.


Instead of averaging with the cell pattern you could multiply the
cell function value with coarsely sampled evaluations of the original
height_field image. That would give "city blocks" of constant height
appropriate for local average terrain. It will introduce steps on
roofs that fall on a cell boundary but maybe it looks like an
intended structure ;)

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