To convert a (AutoCAD drawing) into a PAT (hatch pattern) file, you must first simplify your geometry, as hatch patterns only support straight line segments. Step-by-Step Conversion Process Prepare the Geometry :
The Complete Guide to Converting DWG to PAT Files for AutoCAD convert dwg to pat file
However, you can achieve this using specific utilities or manual workflows. 1. Extracting an Existing Hatch to .PAT To convert a (AutoCAD drawing) into a PAT
Ensure your pattern origin point (0,0) is correctly aligned with the bottom-left corner of your repeating tile during the export process. you must first simplify your geometry