Unity | Procedural Terrain

TerrainGenerator.cs

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class TerrainGenerator : MonoBehaviour {

    public int depth = 20;

    public int width = 256;
    public int height = 256;

    public int scale = 20;

    public float offsetX = 100f;
    public float offsetY = 100f;


	// Use this for initialization
	void Start () {
        offsetX = Random.Range(0f, 9999f);
        offsetY = Random.Range(0f, 9999f);
	}

    // Update is called once per frame
    void Update()
    {
        Terrain terrain = GetComponent<Terrain>();
        terrain.terrainData = GenerateTerrain(terrain.terrainData);

        offsetX += Time.deltaTime * 1.0f;
    }

    TerrainData GenerateTerrain(TerrainData terrainData)
    {
        terrainData.heightmapResolution = width;
        terrainData.size = new Vector3(width, depth, height);

        terrainData.SetHeights(0, 0, GenerateHeights());
        return terrainData;
    }

    float[, ] GenerateHeights()
    {
        float[,] heights = new float[width, height];
        for (int x = 0; x < width; x++)
        {
            for (int y = 0; y < height; y++)
            {
                heights[x, y] = CalculateHeight(x, y);
            }
        }
        return heights;
    }

    float CalculateHeight(int x, int y)
    {
        float xCoord = (float)x / width * scale + offsetX;
        float yCoord = (float)y / height * scale + offsetY;

        return Mathf.PerlinNoise(xCoord, yCoord);
    }
	
}