For the 250 cylinder challenge, am I supposed to free hand the line that goes through both planes?

3:55 PM, Sunday June 15th 2025

After multiple attempts despite the ghosting method, this feels waaaay too hard without a ruler. I don't see a ruler being mentioned in the video nor the notes, but this has to be allowed in order to hit those 2 planes at both cross points, right?

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11:53 PM, Sunday June 15th 2025

Outside of the error analysis steps (marking out the true minor axis for the cylinders around arbitrary minor axes, and drawing line extensions for the cylinders in boxes), no, a ruler's not supposed to be used for that exercise. I am admittedly confused though about which part is giving you trouble.

Are you talking about the part in the first step from these instructions where we draw a line between the midpoint of those two planes? If so, in what way do you feel that this is different from ghosting a line between any two points? Is there something in particular that feels different about the task that changes its nature to something more difficult than what you've done countless times between lessons 1, 2, the box challenge, and the countless warmups before now?

1:35 AM, Wednesday June 18th 2025

Yea the line between the midpoint of both planes. But I was able to better grasp it after starting on the actual midpoint rather than just outside of them. My original understanding was that from outside the box, I would aim a line that would perfectly hit both points and come out the other side, but I would always be off by a bit despite ghosting.

But if I start on one of the actual points, then the other is much easier to manage.

3:47 PM, Wednesday June 18th 2025

I see. Glad to hear you were able to figure out a better approach. There are certainly going to be situations where the only solution is practice, but in such cases imperfect work is still useful. Even if that central minor axis line doesn't line up perfectly to go through both points, in being slightly off, it still gives us something we can use as the basis for our ellipses, we just have to account for that discrepancy when drawing the ellipses (which is still easier than aligning to nothing).

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