Going beyond what's in Module 11/Chapter 7

Click on thumbnail to view short animation.
In the online and on-site versions of this course, I mentioned that I thought there were some problems with the material on reflections. In short, the method given is correct but, in practice, imprecise.

Here I offer a new drawing of what I think is the ultimate answer: Using the same admittedly rough method to draw the object's reflection (that part is skipped here, for clarity), then letting that result suggest VPs for the reflected object, then drafting in accordance with those! THE KEY is using projection lines from the object to its own VPs. Logically, those lines absolutely have to meet with (cross) their own reflections at the foot of the mirror! Follow those projection lines back through the edges of the reflected object, to the horizon to establish VPs that apply just to the reflections. The real world and the reflected world have the same horizon, given a truly vertical mirror surface. With those VPs established you could, for instance, add a tile floor to infinity if you wanted. Or anything else, just using the method for establishing landmarks.

(If you have a station point established so that you can make those two new VPs 90 degrees apart, so much the better. Finding one VP would give you the other. But several projection lines hitting the foot of the mirror -- or where the mirror would be if it continued out to the sides-- would also work, obviating the finding of a second VP, which might lie well off the page)

The above illo should make this clearer.

JH