Oblique Projection — Direction of Projectors Do oblique projections use parallel projectors that are oblique (not perpendicular) to the projection plane, or are the projectors perpendicular to each other and not parallel to the plane as claimed?

Introduction / Context:
Projection systems are classified by the direction of projectors relative to the projection plane. In oblique projection, the projectors are parallel to each other and strike the plane at an oblique angle, producing pictorial depth while keeping one face true size. The stem statement confuses these relationships.

Given Data / Assumptions:

• Orthographic: projectors perpendicular to the plane.
• Oblique: projectors parallel to each other, not perpendicular to the plane.
• Perspective: projectors converge to a point (station point).

Concept / Approach:
Because oblique projectors are parallel and at an oblique angle, all depth lines share the same direction, enabling uniform scaling (full for cavalier, half for cabinet). If projectors were perpendicular to each other, the construction would not match oblique principles or produce consistent depth scaling across the view.

Step-by-Step Solution:
1) Identify the plane of projection for the front face.2) Set a projector direction at an oblique angle, parallel for all points.3) Transfer depths uniformly along this direction with chosen scale.4) Complete the pictorial by joining corresponding points.

Verification / Alternative check:
Compare results with orthographic (perpendicular projectors) and perspective (converging projectors). Only oblique yields parallel, angled depth lines with scalable depth factors.

Why Other Options Are Wrong:
Correct repeats the incorrect claim. Method specific options are irrelevant because both cavalier and cabinet are oblique with parallel projectors. Partially correct does not resolve the core error.

Common Pitfalls:
Mixing orthographic and oblique constructions; forgetting to keep all depth directions parallel.

Final Answer:
Incorrect