So out of the box Revit comes with a useful set of hatch patterns which can be used in your projects to create drafting & model fill patterns. The hatch pattern file uses the same format as AutoCAD & ends with an file extension of .PAT. These hatch pattern file can be found in the following location……
C:\Program Files\Autodesk\Revit Architecture 2012\Data
What if you want to create custom fill patterns based on a material requirements or a specific design you have created? Well you are into writing the .PAT file, which is actually a simple plain text file. There is some great guidance on how to do this in Mastering Revit Architecture bible as well as the Revit help file.
Nether the less, architects are generally visual people, we draw & design; very few of us can write scripts & code! So this is where Hatch Kit Pro steps in. Its a $125 utility for creating hatch patterns & is well worth the money and it will save you hours of pain! Patterns can be created directly in the Hatch Kit Pro or imported as a DXF from say Revit or AutoCAD & then exported to generate the .PAT file. The following video steps through what I think is the quickest process for creating that pattern you have always wanted!