Why does center vp must move in rotated boxes exercise?

3:43 PM, Monday May 11th 2020

Hello!

In the picture illustrating the forth step in the rotated boxes exercise, it is mentioned that vanishing points slides (https://drawabox.com/lesson/1/16/step4).

I get it that VPs slide along the horizon when a box rotates on its own axis but following the instructions, the boxes rotate around the vertical line and I don't get why, in this case, the vp in the center should move.

Am I missing something?

0 users agree
6:45 PM, Monday May 11th 2020
edited at 6:45 PM, May 11th 2020

The rotation of the boxes is the same on the verticals, you could rotate the page and apply the same method. The vp on the center does move on this exercise. If you extend the lines, you'll see it does

edited at 6:45 PM, May 11th 2020
8:15 PM, Monday May 11th 2020

Thank you for your reply!

Well, I found the exact same interrogation on Reddit

Maybe my confusion comes from the fact that I see it as a regular sphere and I shouldn't?

I feel like between the box in the middle and the 90° rotated one, the vp moves towards infinity so it has to slide in between but my brain can't conceptualize it :(

1:37 AM, Tuesday May 12th 2020
edited at 1:39 AM, May 12th 2020

Yeah, this exercise isn't about building a sphere, it's just about learning to get information from other objects that are close to each other. Reread the notes of the exercise and the video if this isn't clear. But basically you can use the corners that are really close between boxes as they will have almost the same perspective, so copying the perspective of the corner you have next to the box you're creating will give you a correct line. This eliminates guesswork, as you can just copy the line without worrying about making perspective mistakes.

That's why one of the mistakes on this exercise is to not put the corners between boxes close, because if you don't put them close, you can't take advantage of it.

Thinking this exercise's objective is to make a sphere is a common misconception. Don't be misguided by the exercise example, look closely at the instructions you're given.

I've seen misinformation on reddit like this exact thing several times, careful with the information you're given there, don't just accept everything you read as truth. If you have doubts, ask where that information came from, and try to understand it.

edited at 1:39 AM, May 12th 2020
6:17 AM, Tuesday May 12th 2020

Ok, I finally get it, with a clear mind.

I gets easier when mentally decomposing the changes in position of the adjacent box: first, create a box right next to it with the same vp (ie. just move it aside without rotation), then apply rotation by sliding vps.

Thanks a lot for your time!

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