How can I make terrafroming in unity, like the game wurm.

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I cant seem to figure out how to accomplish the terrain terraforming in unity. Something like this is what I am trying to accomplish.

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Terrain functions are all documented at Unity - Scripting API: TerrainData

You can retrieve the current terrain height at given world coordinates using Unity - Scripting API: Terrain.SampleHeight

You can also get an array of heights from the terrain data, modify them, and set them back again by referencing them using array index in the terrain data.