I’m trying to imagine a box rotating, and want to be able to draw it without guidelines. Let’s just say you’re drawing boxes or cubes and you start with 1 point perspective, my problem is when that box or cube is going to have 2 points perspective.
Answer
There is no one point perspective or two, There are countless, the point is that the ones you are using are the ones that the parallel sides of a box have.
Take a look at this answer. Finding the possible vanishing points in a landscape
So if you are rotating the base of your cube, just see where the vanishing point is. It is probably very far, outside of your paper, but there it is.
As you rotate the image at some point one of these vanishing points will be parallel, and from that point, a new vanishing point will form.

I have a twopoint perspective (3 actually but let’s forget about it), and I start to rotate the cube.

The vanishing points are there but they are also rotating.

At some point, one of the vanishing points (red) is sooooooooo far away that looks as it is parallel lines.

And it starts to diverge, so the vanishing point starts to form on the other side of those same lines (magenta)

And we went back to step 1.
Attribution
Source : Link , Question Author : Fabrick2020 , Answer Author : Rafael