Thank you for sharing this! This is helpful for solar studies for interiors or if you have a large overhang and want to study lighting for landscape. How did you get your view into a perfect plan angle? I have to manually set the camera at a tilted angle in order to get the Position Camera tool.
Also, I’ve confirmed that the shadows will continue to ignore the section plane if you Save a Scene, Turn Layers On & Off, & Change the Date/Time.