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_dscholtes_
in reply to: shiftctrl.io

I was writing a whole lot of text, but ended up with a much shorter and more generic approach that might work.

- Do not select any walls, select the back instead.

- Get the corner points of each solid making up the box, but disregard the corner points of the selected back.
- Determine which corners make up the inside area of the cabinet.
- Use sets of three corners / points to create planes.

 

Determining which corner points make up the inside area of the cabinet and which set of three points to use for a plane can be done by comparing coordinates of each corner. It would be helpful if the walls were aligned according the origin planes.