When using a 2 point perspective system, it is always advisable to place the vanishing points outside of the composition, so the shapes do no look forced and distorted. If the angle of the object is quite severe, though, one of the vanishing points could fall inside the composition.
Consider the following case. I drew first Cube 1 placing the RVP is inside the composition on purpose. Cube 1 looks great. Then I tried to move Cube 1 to the right of the RVP, just dragging along the X axis, keeping it parallel to its original position, which would be Cube 2. It looks distorted, though. Cube 2 is parallel with Cube 1 so the parallel edges on both cubes are supposed to vanish to the same point. It does not work, though. The reason for this is that Cube 2 is to the right or the RVP.
I know I can solve this problem with extra vanishing points, but then it would not be a 2 vanishing point system anymore. I could also move the viewer to the right, but then the vanishing points would change. I am trying to understand why it does not work as it is.
- In a 2 vanishing point system, does everything need to be placed between the vanishing points to avoid these aberrations (i.e. nothing to the left of the LVP or to the right of the RVP)? Is this a limitation of the system itself?
- Would Cube 2 be outside of the Cone of Vision in this case? Is that the reason why it looks distorted?