Create Smooth Gradient from coast to seabed

[Mordynak]

Morning all,

I am using satellite data to create an island, unfortunately the data doesn’t include any data for underwater.

I am able to extract the coastline, if you like. Which gives me something like the following.
Top most altitude is the sealevel, bottom altitude is the seabed.

What I want to do is create a gradient from top to bottom, in order to blend the height above ground into the seabed.

I thought I might be able to do this with a series of blue nodes but I just cant figure out how to do it.

Any help would be very much appreciated.

Thanks in advance!

[damaggio]

I think it would just easier to take into photoshop and paint the seabed.

[Tomatiy]

Ye, blue nodes - you can try Expander in Linear mode, it will create slopes

But you will need to addtionally modify them, cause they will not look good

[HYLK]

I’m not sure what your data flow looks like, so I assumed a worst possible scenario in which the land and sea floor are combined into one heightmap. If that is the case, I propose the following solution. Note, this is the core principle, you can really increase fidelity with some noise and distortion.

See the .tmd file here: blending-land-and-sea.tmd (122.8 KB)