PerlinNoise

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

public class PerlinNoise : MonoBehaviour
{
    [SerializeField] int width = 256;
    [SerializeField] int height = 256;
    [SerializeField][Range(1f, 200f)] float scale = 20f;

    [SerializeField][Range(1f, 1000f)] float offsetX = 100f;
    [SerializeField][Range(1f, 1000f)] float offsetY = 100f;

    public bool autoUpdate;

    void Start()
    {
        CreateMap();
    }

    public void CreateMap()
    {
        Renderer renderer = GetComponent<Renderer>();
        renderer.material.mainTexture = GenerateTexture();
    }

    Texture2D GenerateTexture()
    {
        Texture2D texture = new Texture2D(width, height);
        CreateNoise(texture);

        texture.Apply();
        return texture;
    }

    void CreateNoise(Texture2D texture)
    {
        
        //Perlin Noise Map
            for (int x = 0; x < width; x++)
            { //Goes 256 times.
                for (int y = 0; y < height; y++)
                { //Going one x then 256 y's until all 256 x's are done.
                    Color color = CalculateColor(x, y);
                    texture.SetPixel(x, y, color);
                }
            }
    }

    Color CalculateColor(int x, int y) //Needs to go from 0 to 1 instead of 0 to 256 pixels.
    {
        float xCoord = (float)x / width * scale + offsetX;
        float yCoord = (float)y / height * scale + offsetY;

        float sample = Mathf.PerlinNoise(xCoord, yCoord);
        return new Color(sample, sample, sample);
    }
}