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Lesson 7: Applying Construction to Vehicles
Video Lectures
As the topics pertinent to this lesson tend to get pretty complicated, there are a couple video demos covering some especially important topics. I do recommend that you read the notes on the first page of this lesson before watching these videos, as they'll help prepare you for some of the topics I cover here.

Ellipses in planes
Not every ellipse we draw will inherently represent a circle in 3D space. When you're drawing them as a part of a larger construction, you have a lot of other elements with which you must remain consistent. This video goes over the criteria that determines whether an ellipse represents a proper circle, when compared against a set of vanishing points.

Constructing to scale
While Drawabox generally deals with the "good enough" school of approximation, there are cases where knowing how to construct an object to a specific scale is very useful. In this case we're still going to apply some approximation techniques, but this is still probably the most technical we ever get.

PureRef
This is another one of those things that aren't sold through Amazon, so I don't get a commission on it - but it's just too good to leave out. PureRef is a fantastic piece of software that is both Windows and Mac compatible. It's used for collecting reference and compiling them into a moodboard. You can move them around freely, have them automatically arranged, zoom in/out and even scale/flip/rotate images as you please. If needed, you can also add little text notes.
When starting on a project, I'll often open it up and start dragging reference images off the internet onto the board. When I'm done, I'll save out a '.pur' file, which embeds all the images. They can get pretty big, but are way more convenient than hauling around folders full of separate images.
Did I mention you can get it for free? The developer allows you to pay whatever amount you want for it. They recommend $5, but they'll allow you to take it for nothing. Really though, with software this versatile and polished, you really should throw them a few bucks if you pick it up. It's more than worth it.