Uncomfortable

2023-03-17 16:52

There's no specific point for how high the floor should be. Rather, the one constant is that if you envision each scene as though it's being viewed by a person, or by a camera, the horizon line represents the level at which that camera sits.

Using the example where the viewer is a human, so the horizon line represents the level of their eyes, if you place another human of equal height into the scene and move it back in space, its eyes will always be at the horizon line regardless of how far away it goes.

This means that when placing the floor, you're basically thinking about how high off the ground the viewer's eyes are meant to be. If you put the horizon very low in the frame, that tells us that we're really low to the ground, often called a "worm's eye view", and if the horizon is very high in the frame, it tells us that we're way above the ground, as if the scene were seen from the eyes of a bird.

As to your other question, specifically this one:

I've read that if you have a one point perspective scene for example, everything that is on the ground level is going to go to that vanishing point, but things who are on other levels will not. Because of that, decorations on the wall or on top of other furniture would not necessarily perfect allign to the same vanishing point. Is is accurate information?

This is not accurate. Every vanishing point governs one set of edges that are parallel to one another in 3D space. If you have a ground plane and a wall, and upon that wall you have a rectangular picture frame, if the picture frame isn't slanted (so it's aligned to the wall on one axis and to the floor on the other), it will share a vanishing point (at least in the depth-wise dimension, given that we're talking about a simple 1 point perspective scene) with the ground plane. If however the picture frame is slanted, it will no longer align to the ground plane, and its own vanishing point will separate from the ground's.