Convergence behavior: Do sets of parallel lines appear to converge toward a single point on the horizon (a vanishing point) in perspective views when they are not parallel to the picture plane?

Introduction / Context:
Perspective simulates how distant objects appear smaller. A key visual cue is that sets of edges that are parallel in 3D seem to meet at finite points on the drawing, called vanishing points, provided those edges are not parallel to the picture plane.

Given Data / Assumptions:

• Lines in space that are parallel to each other and oblique to the picture plane are projected from the station point onto the picture plane.
• Horizon line represents eye level and contains vanishing points for horizontal directions.
• If a set of parallels is exactly parallel to the picture plane, their images remain parallel (no convergence).

Concept / Approach:
The vanishing point for a set of parallels is found by projecting a line from the station point in the same direction as those parallels and marking its intersection with the picture plane. This point lies on the horizon for horizontal directions and off the horizon for non-horizontal directions. Hence, convergence occurs when the set is not parallel to the picture plane.

Step-by-Step Solution:
Identify direction of a parallel set.Construct a ray from the station point parallel to that direction.Mark the intersection with the picture plane; that is the vanishing point.Note that edges parallel to the picture plane stay parallel in the image (no convergence).

Verification / Alternative check:
Observe railroad tracks receding on level ground; they visually converge at a point on the horizon aligned with the track direction.

Why Other Options Are Wrong:
Limiting convergence to vertical edges, specific object elevations, or inclined ground planes ignores the general directional rule.

Common Pitfalls:
Forgetting the caveat: parallels parallel to the picture plane do not converge; they retain constant spacing on the image.

Final Answer:
Correct