Placement of the picture plane relative to the station point Good practice keeps the picture plane in front of (beyond) the station point toward the object; it should not be placed behind the observer.

Introduction / Context:
In linear perspective, the picture plane is the 2D surface onto which the 3D scene is projected. The station point represents the observer’s eye location. The geometric relationship between these two is fundamental to constructing a coherent image without ambiguity or inversion.

Given Data / Assumptions:

• We use central projection rays originating at the station point.
• The picture plane must be intersected by rays before reaching the object.
• We seek a practical, physically meaningful setup.

Concept / Approach:
Projection rays emanate from the station point, pass through the scene, and intersect the picture plane to form the drawing. Placing the picture plane behind the station point would require rays to “project backward,” yielding nonphysical or inverted constructions. Standard drafting places the picture plane between the observer and the object, ensuring every visible scene point has a forward intersection with the plane.

Step-by-Step Solution:

Verification / Alternative check:
In ray-tracing or CAD camera models, the near clipping (image) plane lies in front of the camera (eye). Moving it behind the camera yields undefined or empty imagery, confirming the practical rule.

Why Other Options Are Wrong:
Restricting the rule to one-point perspective, CAD-only workflows, or specific horizon scenarios misconstrues the basic geometry that applies to all linear perspective setups.

Common Pitfalls:
Mislabeling front/back relative to the station point, or placing the plane so close that severe distortion occurs.

Final Answer:
Correct