Converting is a common workflow for CAD professionals who need to turn custom line-work into repeatable hatch patterns. While a Drawing Exchange Format (DXF) file contains vector data, an AutoCAD Hatch Pattern (PAT) file is a specific text-based format that defines how lines repeat across a surface. Why Convert DXF to PAT?
Developed by Autodesk in the early 1980s, DXF (Drawing Exchange Format) was created to allow interoperability between AutoCAD and other software. Unlike raster images (JPEGs or PNGs), DXF files are vector-based. This means they store geometry as mathematical equations: lines, arcs, polylines, circles, and text.
This is the most robust method. Users load a DXF drawing containing the "seed" geometry (usually a small square or rectangular unit of repetition) into a script (LISP, Python, or specific plugin). dxf to pat
There are three primary avenues to convert your prepared DXF file into a PAT file, ranging from automated software to manual coding. Method 1: Using Dedicated CAD Add-ons and Express Tools
Move your pattern tile near the origin (0,0) . This prevents alignment errors when the pattern repeats. Converting is a common workflow for CAD professionals
A single DXF entity (e.g., a polyline) must be transformed into one or more such line families.
Because PAT files are plain text, advanced users can manually create or convert patterns by writing their own definitions. This requires a deep understanding of the PAT syntax and is only recommended for simple geometric patterns. While tedious, this approach gives you complete control over every parameter of your hatch pattern. Developed by Autodesk in the early 1980s, DXF
: A widely recommended professional tool that imports DXF files and generates clean .pat code.
Converting a DXF file to a PAT file opens up a world of possibilities: