How to add new hatch pattern in AutoCAD?

Brief Answer: To add a new hatch pattern in AutoCAD, you can either create a custom hatch pattern in the .PAT file or use a pre-existing .PAT file.

Detailed Explanation and Solutions:

1. Understanding the Challenge:
   • AutoCAD uses .PAT files for hatch patterns.
   • Adding a new pattern involves editing these files or importing new ones.
2. Creating a Custom Hatch Pattern:
   • Locate the .PAT File: Find the AutoCAD Support folder (usually C:\Program Files\Autodesk\AutoCAD [version]\Support).
   • Edit .PAT File: Open the acad.pat file in a text editor like Notepad.
   • Define New Pattern: Add your custom hatch pattern definition at the end of the file. Follow the .PAT file format.
   • Save the .PAT File: Save your changes.
3. Using a Pre-Existing .PAT File:
   • Obtain .PAT File: Find a .PAT file with the desired hatch pattern.
   • Place in Support Folder: Copy the .PAT file into the AutoCAD Support folder.
   • Load in AutoCAD: In AutoCAD, use the HATCH command, click on ‘Custom’ and ‘Load’, then browse and select your .PAT file.
4. Using Hatch Creation Software (Alternative):
   • Use Software: Utilize software designed for creating AutoCAD hatch patterns.
   • Export .PAT File: Save the pattern as a .PAT file.
   • Load in AutoCAD: Follow the same steps as using a pre-existing .PAT file.

Key Points:

• Format Knowledge: Understand the .PAT file format for creating custom patterns.
• Backup Original File: Always make a backup of the original acad.pat file before editing.
• Restart AutoCAD: You may need to restart AutoCAD to see the new patterns in the hatch list.

Adding new hatch patterns in AutoCAD allows for greater customization in your designs, whether by creating your unique patterns or importing existing ones.