I wanted to create a script to visualize the `Rule of Thirds` inside the 3ds Max Viewport, to aid in the composition of my camera shots. Inspired by this script I also added some other overlay options. The lines inside the viewport are drawn as a kind of render effect, so no geometry is created and no camera is needed. They will interactively adjust to any image aspect and are visible in the active viewport, so switching the viewport will also move the lines there. Use the checkboxes to toggle each ones visibility.
Download from github: https://github.com/cb109/imagecomphelper
If you use this script, be awesome and donate a few bucks!