Triggers on Terrain

Would it be possible to use a cylinder trigger to affect that specified area on terrain? More specifically, I would like to flatten that area of terrain in Start(). This also has to be in prefab. Need a simple answer.Thanks in advance!:-D

 

If the above doesn't work, would editing the terrain coordinates at the prefab's position be useful?

 

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Any solution that modifies the terrain at runtime is going to require code. I don't see how a trigger or collider would help with that at all. An empty game object could be used for its location information, and you could even put a script on it that either does the work or has enough information for another script to do the work.

 

I just need the terrain at the trigger's position to be flat(It's generated randomly). I'll try modifying the terrain at the trigger's position after it is generated in an empty game object as you said. Thanks!