In an interview with Chris from the Lazy Days podcast, he explained that in an isometric sketch your drawing moves from an X (where the axis is located) to a Y (where the axis is located) and then comes back to a center (which is where the pencil is pointing). The concept is similar to that of the line drawing, or in the case of isometric sketches, to just drawing a line. The difference is that drawing a line in the X position produces a flat line, but drawing isometric lines produces a curved line. So drawing a line in the Y position will result in a line curved like a curve. So, when you are doing the drawing of the isometric image, the direction of your drawing will be perpendicular to that line, as far as the drawing is concerned. The isometric sketch then has a fixed center point, as opposed to a view where the drawing can move freely, as in the diagram.
What are the limits of drawing an isometric image?
Chris explained that isometric drawings are limited in a few ways. First, unlike a drawing of an isometric line where there is no line thickness or line length, in an isometric sketch, there is no thickness of the line to begin with. Second, isometric drawings are limited in the way in which the drawing is made (or at least that it can be made) because drawing is a method and the drawing can only be understood by drawing it. As such isometric sketches need to be done quickly, and do not work well if you draw them while you’re having to think. As such a drawing is slow and will not move with the lines it has drawn. Finally, a drawing without strokes and edges has a number of limitations on it such as the ability to move left and right on an image, or just turning a pencil with a certain motion of your mouth.
However, there are times in isometric art when it is necessary to have smooth edges, or smooth curves and lines. These are called isometric arcs, but the word arcs comes from the Latin word arctum, meaning the end of a line. In isometric arc it is easy to see, as you can see right here on the next page, that the ends of the lines are in different places. So instead of showing us that the lines are drawn with a certain motion, the lines actually are drawn just as they are when looking at them from a different angle (you can see for yourself on this page),
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