Which statement about directional light rays is true?

Which statement about directional light rays is true?

• A. They are parallel rays
• B. They are divergent rays
• C. They are radial rays
• D. They are circular rays

Answer: (A)

Directional light in 3D rendering is modeled as coming from infinitely far away, so its rays are parallel. This mirrors how sunlight behaves: all rays travel in roughly the same direction, producing consistent illumination and parallel shadows across the scene. Divergent rays would come from a nearby point source and spread outward, which isn’t how directional light behaves. Radial or circular rays aren’t standard descriptors for directional lighting and don’t describe its parallel propagation.

Directional light in 3D rendering is modeled as coming from infinitely far away, so its rays are parallel. This mirrors how sunlight behaves: all rays travel in roughly the same direction, producing consistent illumination and parallel shadows across the scene. Divergent rays would come from a nearby point source and spread outward, which isn’t how directional light behaves. Radial or circular rays aren’t standard descriptors for directional lighting and don’t describe its parallel propagation.