Hi,
Try applying an Unwrap UVW,
And from the Edit UVW's dialog, Mapping menu, choose Flatten Mapping,
I guess the default 45 degrees might be enough, you can experiment,
Anyway, after clicking ok, make sure the UVs don't overlap for better results.
------------------------------------------------------
miledrizk@gmail.com
3DS Max 2021, V-Ray 5.2
3DS Max user since 2003 (3DS Max 7)
V-Ray user since 2008 (V-Ray 1.47)
My YouTube Channel http//www.youtube.com/c/MiledRizk