柏林噪声地形图

public RectTransform redimg;//小地图中的人物红点
    public Transform player;//人物
    public Image map;//小地图（父级要有个Mash组件）


    public Texture2D texture;
    public int w=50;
    public int h=50;
    public Color gaocolor = Color.black;
    public Color dicolor = Color.white;
    public float max = 10;
    // Start is called before the first frame update
    void Start()
    {
        texture = new Texture2D(w,h);
        VertexHelper vh = new VertexHelper();
        for (int x = 0; x < w; x++)
        {
            for (int z = 0; z < h; z++)
            {
                float noise = Mathf.PerlinNoise(x*0.1f, z*0.1f);
                float y = noise * max;
                float uvx = (float)x / (float)(w - 1);
                float uvy = (float)z / (float)(h - 1);
                Color color = Color.Lerp(dicolor,gaocolor, noise);
                texture.SetPixel(x, z, color);
                vh.AddVert(new Vector3(x, y, z), Color.white, new Vector2(uvx, uvy));
                if (x != w - 1 && z != h - 1)
                {
                    vh.AddTriangle(x * h + z, x * h + z + 1, (x + 1) * h + z + 1);
                    vh.AddTriangle(x * h + z, (x + 1) * h + z + 1, (x + 1) * h + z);
                }
            }
        }
        texture.Apply();
        Mesh mesh = new Mesh();
        vh.FillMesh(mesh);
        GetComponent<MeshFilter>().mesh = mesh;
        GetComponent<MeshCollider>().sharedMesh = mesh;

        Material material = new Material(Shader.Find("UI/Default"));
        material.mainTexture = texture;
        map.material = material;
        GetComponent<MeshRenderer>().material = material;
        
    }

    // Update is called once per frame
    void Update()
    {
        float pivotX = (player.transform.position.x ) / (float)w;
        float pivotY = (player.transform.position.z ) / (float)h;
        map.rectTransform.pivot = new Vector2(pivotX, pivotY);
        redimg.transform.eulerAngles = Vector3.back * player.transform.eulerAngles.y;
    }