AutoCAD Plan Oblique Drafting Tool

An automated AutoLISP tool for AutoCAD to streamline Plan Oblique projections. This script manages cursor angles, grid styles, and polar tracking with a single toggle.

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Features

• One-Key Toggle: Switch between Standard Plan and Oblique mode (F4 is suggested, but any shortcut key can be used).
• Custom Angles: Support for any angle (e.g., 25-65 or 45-45) via the OBLSET command.
• Auto-Polar Tracking: Automatically updates Polar Tracking "Additional Angles" to match your oblique axes.
• Smart Grid: Automatically switches to a Dotted Grid in oblique mode for better visual clarity.

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Installation

1. Save the Script

Download PlanOblique.lsp and save it to a secure folder on your computer (e.g., C:\AutoCAD_Tools\).

2. Add to Startup Suite (Auto-Load)

To ensure the tool is available every time you open a new drawing:

1. Type APPLOAD in the command line and press Enter.
2. Click the Contents... button under the Startup Suite (briefcase icon).
3. Click Add..., select your PlanOblique.lsp file, and close the windows.

3. Assign to a Shortcut Key (Optional)

Assigning a shortcut key is highly recommended for efficiency. Once assigned, you can toggle the tool instantly with a single keypress instead of typing the command:

1. Type CUI in the command line.
2. In the Command List (bottom left), click the New Command (star icon) button.
3. In the Properties panel (right side), enter the following:
   • Name: Plan Oblique Toggle
   • Macro: ^C^C_OBLTOG
4. In the top-left tree, find Keyboard Shortcuts > Shortcut Keys.
5. Drag and drop your new "Plan Oblique Toggle" command into the Shortcut Keys folder.
6. Click the command in the folder, go to the Key(s) row in Properties, and press your desired shortcut key (e.g., F4).
7. Click Apply and OK.

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Commands

• OBLSET: Define the base angle for the projection (e.g., enter 25 for a 25-65 degree system).
• OBLTOG: Toggle the mode ON or OFF.
  • Note: If you have assigned a shortcut key as described in Step 3, you can use that key instead of typing this command manually.

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Context

In architectural representation, Plan Oblique projections maintain the true scale of the floor plan while illustrating spatial depth. This tool automates the manual setup of UCS and Snap angles, making it easier to produce accurate architectural drawings.

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Author

Barış Yorulmaz Architecture Student @ Middle East Technical University (METU)

License

This project is licensed under the MIT License.