For AutoCAD: Copy your new .pat file to the AutoCAD support folder, or load it directly using the _HATCH or _BHATCH commands. The pattern name must match the filename (excluding the .pat extension), and the file should be placed in AutoCAD's search path.
For a perfectly horizontal line of dashes and gaps, your code would look like this:
A standard hatch pattern definition consists of a header and one or more line descriptor lines. The syntax generally follows this structure:
Since writing PAT code manually is tedious, most users utilize one of the following tools: SAVING AUTOCAD DWG AS .PAT FILE - Forums, Autodesk dxf to pat
Imagine an architect named Elias who has just hand-drawn a beautiful, irregular cobblestone pattern in AutoCAD. He wants to use this design to "paint" the entire courtyard of a digital plaza.
Scale your drawing to its real-world dimensions. If a tile is supposed to be 12 inches by 12 inches, ensure your CAD geometry measures exactly 12x12 units. Step 4: Export to DXF Go to File > Save As .
As of 2025, Autodesk has not introduced a native "Export to PAT" command. The industry relies on third-party tools, but that is slowly changing. New AI-assisted pattern tools (e.g., PatternAC, HatchMaker AI) can now take a messy DXF of a stone wall and automatically detect the smallest repeating unit cell, removing the manual bounding box step. For AutoCAD: Copy your new
: Platforms like Pattycake allow you to import a DXF directly to generate a PAT file. This is often the simplest method as it handles the complex math required for angled or repeating lines.
For occasional use, web-based conversion tools allow you to upload a DXF file and download a PAT file. While convenient, online converters can struggle with complex nesting, curves, or precise tiling alignment, making them best suited for simple geometric patterns. Step-by-Step Workflow: Preparing and Converting DXF to PAT
If your CAD program freezes when applying the hatch, your PAT file contains too many short lines or the hatch scale is set too small. Use fewer line segments to represent curves, or increase the default hatch scale upon import. The Hatch Appears Solid Black or Blank The syntax generally follows this structure: Since writing
A simple PAT definition looks like this: *PatternName, Description Angle, X-origin, Y-origin, Delta-X, Delta-Y, Dash1, Dash2, Dash3...
Open a trusted online conversion platform (such as CloudConvert, Convertio, or specialized CAD utilities). Select the Output: Choose PAT as your target output format.
Developed by Autodesk, this vector format acts as a universal translator between different CAD packages. It stores explicit geometry using X, Y, and Z coordinates.
