Extrude large terrain region

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#1

The Problem

Im having problems to make an isalnd with terrain, and i need to extrude the bottom part, so i can put water and the island doesn’t looks like it is “floating in the water”

Example:

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What i want to do in a nutshell:

image
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Source: Terrain GapFIll - #12 by PeZsmistic

What i tried so far?

  • I tried with @PeZsmistic 's code, but it doesn’t work with very large areas

  • Using the default terrain tools might take me a very long time, so i didn’t tried it

  • I tried using the terrain editor scale tool, but it only allows small regions

  • I tried importing the same heightmap, but under the current terrain, but the result was bad

Any help will be welcome.

Thank you!

#2

Use the replace tool, you can find it under Terrain editor - Edit - Replace. Then you choose “Box” if it’s not already chosen and make it as big as you want. In the end choose air in “source material” and the material you want in “Target material”.

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