I am drawing a room, which is 10m x 10m (or whatever units).
I am drawing it in one point perspective.
How do I determine exactly where to draw the back wall? As in, how far back.
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This solution will work any shape of room you have. Cubic, rectangular (as I demonstrate), and even rooms you aren't looking at from straight on (in which case you rotate the top elevation, a common perspective technique).
Click on any image for a larger view.
Layout the general lines.
The real trick to this technique is mapping the angles between corners to the Measuring Points on the Horizon Line.
Draw your normal perspective lines on your room
Now the technique comes into play. You'll use the Measuring Points to map a projection to tell you where the back wall begins
Standard perspective techniques will give you the top of the back wall.
Go over your final guidelines and clean it up!
In the following explanation I had to make some assumptions:
This is modified from the book "Anatomy, Perspective and Composition for the Artist" by Stan Smith, Dover Publications Inc., 2014.
Since this technique is different enough from my other answer, I felt it warranted a separate answer. This technique allows for more accurate control over distances from the object, making it easier to get a feel for the space you'll be creating.