Identify the smallest rectangle that can be repeated to create the pattern. Draw a rectangle around this area. Everything inside this rectangle is your pattern; everything outside is waste.
Isolate exactly one repeating unit of your design.
The story of converting a (Drawing Exchange Format) file into a PAT (AutoCAD Hatch Pattern) file is a classic workflow for designers looking to turn custom geometry into reusable textures. While DXF files represent universal vector data [9, 12], PAT files specifically define the repeating mathematical instructions for "hatching" or filling areas in CAD software [13, 20]. The Path from Geometry to Pattern
A .pat file assumes the pattern repeats infinitely. A .dxf file has finite geometry. The conversion process essentially "teaches" AutoCAD how to repeat your design.
: Older AutoCAD workflows often use LISP scripts (like getpat.lsp ) to extract existing hatches from a drawing into a .pat file. Technical Constraints of .PAT Files dxf to pat
Stop exploding hatches and start building your custom library today. Happy hatching
Test and iterate
import ezdxf
A strictly text-based configuration file. It does not contain geometry. Instead, it holds mathematical instructions specifying line angles, origin coordinates, offsets, and dash-dot spacing arrays. Identify the smallest rectangle that can be repeated
Remove overlapping lines and unnecessary layers to avoid a bloated file. 2. Export to DXF
Standard libraries often lack specialized materials like unique parquet, stonework, or branding logos.
; Simple horizontal hatch *SimpleHatch, Horizontal lines every 10 units 0, 0,0, 10,0, 1000,-10
HatchKit is widely considered the best tool for converting DXF files to PAT files. It provides a user-friendly interface and supports importing DXF files, editing patterns, and exporting to PAT format. Unlike simple hatch generators, HatchKit has the unique ability to open any hatch pattern contained in any supported hatch pattern file format, edit it, and save to any of the supported formats. It supports import of LINE, POINT, CIRCLE, ARC, ELLIPSE, LWPLINE, and POLYLINE entities from DXF files. HatchKit works with all versions of AutoCAD, ACADLT, Alibre, AllyCAD, DataCAD, General CADD, IntelliCAD, MegaCAD, MicroStation V8, Revit, SolidWorks, Spirit, and TurboCAD via DXF or HPGL import from your CAD system. Isolate exactly one repeating unit of your design
Draw your repeating pattern tile in your CAD software and export it as a DXF file. Ensure you use an older DXF version (like AutoCAD R12/LT2 DXF) for maximum converter compatibility.
Here's a step-by-step guide to converting a DXF file to a PAT file using Adobe Illustrator:
Because manual coding is tedious, engineers and designers rely on specialised tools and plugins to automate the conversion process. Method 1: Using Dedicated Hatch Pattern Software