A pattern file is a text file that contains definitions for model patterns or drafting patterns.
The file must be saved with a PAT extension.
In a typical installation, a number of sample PAT files are installed and can be used to create custom fill patterns. The sample PAT files can be found here:
If you create a custom pattern file for Revit LT, it can be stored in any location. If your organization develops a PAT file containing standard patterns to use in projects, you may want to store the file in a network location for easy access by all Revit LT users.
After Revit LT imports information from the pattern file, the actual file is not referenced. If you need to rescale imported patterns, you can do so without re-importing the file.
For information on using a custom pattern file, see Create a Custom Fill Pattern.