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I think that technique is called "plan perspective." (I read three different books on perspective last evening). And that seemed to be the only way to get the info I was looking for.
I was hoping for something simpler, because I'm not actually drawing a cube. I'm drawing the inside of a boat cockpit.
I've also heard this referred to as descriptive geometry. Keith Ferris, the aviation artist, says he uses it to draw exotic angles on fighter planes (from blueprints). One of my perspective books has an example of an airplane in a box drawn this way, but frankly I can't make heads or tails out of how they've explained it.
It has nothing to do with portraits, but if any of you know of any books that explain this technique in English (particularly as it applies to objects more complicated than a house), I'd like to read one.
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