I found a thread on how to create a perfect cube in perspective here: http://conceptart.org/forums/showthr...ng-perspective
The solution proposed in the thread assuredly would work, but seemed really complicated. I figured there had to be an easier way, and it occurred to me that by measuring 1/2 the original vertical line, you could find the point at which the diagonals from the top and bottom of line to their opposite corners would intersect.
This seems to make sense to me, and I can't think of any problems with it, but I wanted to see what other people thought and if anyone could find a hole in my logic. I've included an image to hopefully help clarify the solution:
Ps: sorry if this is in the wrong place, I'm fairly new here.