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    [MenuItem("My Editor Scripts/Carve Land")]
    static void CreateBase()
    {
        GameObject landPiece = new GameObject();
        landPiece.AddComponent<CarveLand>();
        landPiece.name = "Land Piece";
        Selection.activeGameObject = landPiece;
        Undo.RegisterCreatedObjectUndo(landPiece, "Created Land Piece");
        landPiece.GetComponent<CarveLand>().Reset();
    }

    public void Reset()
    {
        MyUtilityScript.ClearLog();
        storedHits.Clear();
        grid = vol.Multiply(res);
        var verts = new List<Vector3>();
        var uv = new List<Vector2>();
        var step = new Vector2(1f / grid.x, 1f / grid.z);
        step *= UVres;
        colors = new Color[(grid.x + 1)*(grid.z + 1)];

        for (int z = 0; z <= grid.z; z++)
        {
            for (int x = 0; x <= grid.x; x++)
            {
                verts.Add(new Vector3(x, 0, z) / res);
                uv.Add(new Vector2(x * step.x, z * step.y));
                colors[x + z * (1 + grid.x)] = Color.red;
            }
        }
        uvs = uv.ToArray();
        vertices = verts.ToArray();
        updateCollider = true;
        AddTris();

    void AddTris()
    {
        List<int> tris = new List<int>();

        for (int A = 0; tris.Count < grid.x * grid.z * 6; A++)
        {
            if (vertices[A].x == vol.x) continue;
            int B = A + grid.x + 1;
            int C = A + 1;
            int D = C + grid.x + 1;
            tris.AddRange(new int[]{ A, B, C, D, C, B});
        }
        triangles = tris.ToArray();
        ApplyMesh();
    }

    void ApplyMesh()
    {
        Undo.RecordObjects(new Object[] { this, GetComponent<MeshFilter>() }, "Carve Land");
        var mesh = new Mesh();
        mesh.vertices = vertices;
        mesh.triangles = triangles;
        mesh.uv = uvs;
        mesh.colors = colors;
        mesh.RecalculateNormals();
        mesh.RecalculateBounds();
        mesh.Optimize();
        GetComponent<MeshFilter>().sharedMesh = mesh;

        if (updateCollider)
        {
            updateCollider = false;
            GetComponent<MeshCollider>().sharedMesh = mesh;
        }
    }
    }

public int res = 1321, UVres = 345, d = 456, seed = 1;

mask = new Texture2D(1024, 1024, TextureFormat.RGB24, false);

if(Event.current.mouseDown)
Undo.RecordObject(mask, "Paint Mask");

[SerializeField, HideInInspector]
Color32[] pxl;

void OnEnable()
{
    Undo.undoRedoPerformed = (Undo.UndoRedoCallback)System.Delegate.Combine(Undo.undoRedoPerformed, new Undo.UndoRedoCallback(this.UndoRedoPerformed));
    SceneView.onSceneGUIDelegate += SceneGUI;
}

void SceneGUI(SceneView sceneView)
{
    if (Event.current.mouseDown)
    {
        pxl = mask.GetPixels32();
        Undo.RecordObject(mask, "Paint Mask");
    }
    //прочий код
}

void UndoRedoPerformed()
{
    mask.SetPixels32(pxl);
    mask.Apply();
}
 

Mesh mesh = GetComponent<MeshFilter>().sharedMesh;
mesh.colors = newСolors;
//и так далее
Undo.RecordObject(GetComponent<MeshFilter>(), "Edit mesh");
GetComponent<MeshFilter>().sharedMesh = mesh;

Mesh mesh = Instantiate(GetComponent<MeshFilter>().sharedMesh);
mesh.colors = newСolors;
//и так далее
Undo.RecordObject(GetComponent<MeshFilter>(), "Edit mesh");
GetComponent<MeshFilter>().sharedMesh = mesh;