The server reads your uploaded DWG file. Because DWG is a proprietary format, most online converters rely on open-source libraries (like Open Design Alliance or LibreDWG) to extract vector data. They ignore 3D meshes, raster images, and blocks, focusing only on lines, polylines, arcs, and circles.
The converter calculates the vector displacement for each line segment (dX, dY, angle). It writes these calculations into a structured text file with the .pat extension. The output is a hatch pattern that AutoCAD can read instantly. dwg to pat file converter online
A DWG is a complex drawing file, while a PAT file is a simple text-based set of coordinates and dash patterns. The server reads your uploaded DWG file
Simply upload your geometry, and the algorithm calculates the repeating "tile" coordinates for you. The converter calculates the vector displacement for each
There it was: SLATE_CUSTOM.pat .
A typical PAT file looks like this in a text editor: *PatternName, Description 45, 0,0, 0,0.125, 0.125,-0.125