I'm doing the contour curves for Lesson 4 right now and am confused about the way they wrap around the sausage. In most of the Homework submissions and in the example the "hooks" of the curve always point in one direction but shouldn't they swap directions after the point where you would look at the edge of the ellipse.
Here's a small drawing to illustrate my point.
This relates to the minor axis and the change in degree of the ellipse. Contour curves are basically the same as ellipses in that they have a degree and minor axis, the only difference is that they're just a partially drawn ellipse
In the case where the contours change direction, then the contour that we are looking dead onto would be a straight line or an ellipse with a very small, sharp degree, before widening out as they curve away from us. You might like to read over these notes again as a refresher on how this works. The example with the coin is particularly pertinent here as well.
Hopefully that makes sense. :)
When it comes to technical drawing, there's no one better than Scott Robertson. I regularly use this book as a reference when eyeballing my perspective just won't cut it anymore. Need to figure out exactly how to rotate an object in 3D space? How to project a shape in perspective? Look no further.
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