the terrain rises and lowers automatically

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how can I do that in certain parts of the land, the land rises and lowers automatically ?

Take a look at Terrain and the [TerrainData][1] class in the script reference, more specifically the SetHeight function [1]: http://docs.unity3d.com/Documentation/ScriptReference/TerrainData.html

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I need that the land rises and lowers automatically continuously without stopping

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1 Answer

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If you want to move the entire terrain up and down, a simple solution is to control its transform.position (attach this script to the terrain):

public range: float = 0.5; // how much terrain swings up and down (meters)
public speed: float = 6.28; // 6.28 * cycles per second

private p0: Vector3;

function Start(){
  p0 = transform.position;
}

function Update(){
  transform.position = p0 + Vector3.up * range * Mathf.Sin(speed * Time.time);
}

But things are way more complicated if you want to move only parts of the terrain: you must somehow define the region you want to move, get the current heights in this region in an square array with GetHeights, modify and assign them back with SetHeights.