How To Use Lisp Command In AutoCAD

Understanding AutoLISP in AutoCAD

AutoLISP is a powerful dialect of the Lisp programming language, specifically tailored for use in AutoCAD and similar CAD software. It allows users to automate tasks and create custom commands, enhancing productivity and streamlining workflows. With AutoLISP, you can program specific actions to meet your unique design requirements, making it an invaluable tool for AutoCAD users.

Running a LISP File in AutoCAD

To execute a LISP file within AutoCAD, follow these steps:

1. Start by launching AutoCAD 2025.
2. Open the command prompt by typing APPLOAD and pressing .
3. In the application load dialog that appears, locate the LISP file you wish to run.
4. Select the file, then click Load.
5. Your LISP routine is now ready to be used within your AutoCAD session.

Create and Save LISP Routines

Writing your own LISP routines is straightforward. Here’s how to create a new routine:

1. Navigate to the Tools menu and select AutoLISP, then launch the Visual LISP Editor.
2. In the editor, select File and then New to open a blank text editor.
3. Input your LISP commands in this editor.
4. After writing your commands, save your routine by selecting File and then Save.
5. Make sure to save the file with a .lsp extension for AutoCAD to recognize it.

Loading LISP Files Automatically on Startup

If you want certain LISP routines to load automatically each time you start AutoCAD, follow these steps:

1. Use the command APPLOAD to open the LISP file dialog.
2. Click on the Contents button within the Startup Suite section.
3. Select Add, then browse to find the location of your LISP file.
4. After selecting the desired file, click Open.
5. Confirm that all required routines have been added to your Startup Suite, then click Close.

Understanding the LSP File Format

LSP files are plain text documents containing AutoLISP code. These files can be executed through the AutoCAD LISP interpreter. They are essential for automating tasks within AutoCAD and can contain various commands and routines for custom functionalities.

Using LISP in AutoCAD LT

AutoCAD LT does not support AutoLISP due to its limited functionality compared to the full version of AutoCAD. Users looking to deploy LISP routines must utilize the full version to take advantage of this powerful feature. AutoCAD LT users can, however, benefit from other automation tools available within the software.

FAQs

1. Can I learn AutoLISP online?

Yes, there are various resources available online, including tutorials, forums, and video courses that offer comprehensive guides to learning AutoLISP.

2. What is the difference between AutoCAD and AutoCAD LT?

AutoCAD includes full 3D modeling capabilities and supports LISP, while AutoCAD LT is limited to 2D drafting and does not provide support for AutoLISP or 3D functionalities.

3. What are some common applications of LISP routines in AutoCAD?

LISP routines can automate repetitive tasks, customize commands, create complex geometric shapes, and streamline drawing processes, improving overall efficiency in design projects.