Terrain.SampleHeight

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public float SampleHeight(Vector3 worldPosition);

Description

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

using UnityEngine;

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

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