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This does look rectangular now that you mention it.
Just to make sure I'm explaining myself clearly, I understand that the B&C lines will always be shorter than the A line due to foreshortening. But what I'm wondering is: is there a method to precisely define the length of the B&C line in relation to the A line (while taking the foreshortening into account), since they're all supposed to be 4 inches long? All the perspective stuff I've read (except for plan perspective) seem to define the length of foreshortened lines only in relation to themselves (as in finding half distances).
I got into this question when I started to draw a rectangular background object (in perspective) that I knew was 46 inches tall and 6.5 ft. long. The 46 inches tall was no problem, but I couldn't figure how to draw the 6.5 ft. length accurately, in perspective, relative to the 46 inch height.
Is this still a "can't be done" situation?
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