Terrain.SampleHeight

Description

Samples the height at the given position defined in world space, relative to the Terrain space.

This method automatically clamps the world position to the Terrain boundaries.

using UnityEngine;

public class ExampleScript : MonoBehaviour
{
    void LateUpdate()
    {
        Vector3 pos = transform.position;
        pos.y = Terrain.activeTerrain.SampleHeight(transform.position);
        transform.position = pos;
    }
}