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10:37 AM, Friday June 12th 2020

Thanks so much for the reply.

For example in your sample corrections, on box 3, you've corrected the minor axis line as one line, correcting for the far plane, but the ellipse on the near face is significantly more skewed than it, so the minor axis is still a bit off.

I still dont really understand how to do this part? sorry i cant explain well but i just dont see where exactly its skewed and where the minor axis is off? (the minor axis seems to look correct to me since its going through both ellipses shooting straight out the middle)

I know how to correct the box, but its the cylinder im having trouble with. is there a step by step demonstration of how to do this anywhere?

the website has the correcting phase all in just one picture so i dont really know the process of it

11:06 AM, Friday June 12th 2020
edited at 11:06 AM, Jun 12th 2020

If you take away the box, the cylinder is exactly the same as the cylinders constructed around an arbitrary minor axis, so they're corrected in the same way. Ignore the lines of the box as best you can while you correct the minor axis, because it can and will throw you off and try to tell you that it's properly aligned.

I was talking about box 2, sorry, I misread your page. Here is where I'd approximate the minor axis to be on each plane. I'm a bit tired so it could be a bit off, but you'll notice they take slightly different angles and are offset from one another. In an ideal world, the minor axis correction would just be the same line you drew through the midpoint of the planes on each end but we're imperfect humans and will often have some level of inaccuracy.

edited at 11:06 AM, Jun 12th 2020
11:34 AM, Friday June 12th 2020

Its all good thanks! i can understand it a bit better now. when correcting the minor axis i see you extended the (yellow line) towards the viewer? isnt it suppose to go back towards the back vanishing point?

1:24 AM, Saturday June 13th 2020

It's similar to what is shown here, in that it strays from the vanishing point, which it will do, since it's highlighting an error in the way you've drawn your ellipse compared to the true minor axis (the one that you draw through the middle of the box). If you mean that it's not connecting back to the minor axis line you drew, then yeah, I probably should've when I drew the example.

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