<Houdini is really amazing what one can do with it. Wish i had concentrated more on Houdini and not
on so many other apps …>

Yup, it's a 3D sandbox :)

Here's an little example of what you can do with curves too, looks close from your last post.
For every points of the grid, I compute the distance of the closest point from every curves ... then I remap this distance with my own profile, and use the result as displace (elevation).
Displace strength, max distance search and profile options are in the pink node.