Which statement correctly describes Ray-Traced shadows?

Which statement correctly describes Ray-Traced shadows?

• A. They are generated by tracing the path of rays sampled from a light source.
• B. They always produce a hard edge.
• C. They are less accurate than shadow-mapped shadows.
• D. They do not support transparency.

Answer: (A)

Ray-traced shadows work by casting rays from the light into the scene and testing whether those rays reach a surface point without being blocked by another object. If a ray is blocked, that point is in shadow; if not, it is lit. This directly matches the description that shadows are generated by tracing the path of rays sampled from a light source. Because the method follows how light actually behaves, it can produce hard shadows with a point light or soft shadows when using area lights or sampling many rays. It can also handle transparency by letting rays pass through partially translucent objects, attenuating the light accordingly. That combination—sampling rays from the light to determine occlusion—is what makes ray-traced shadows accurate and flexible compared with other shadow techniques, which is why the statement about their generation by tracing rays is the best description.

Ray-traced shadows work by casting rays from the light into the scene and testing whether those rays reach a surface point without being blocked by another object. If a ray is blocked, that point is in shadow; if not, it is lit. This directly matches the description that shadows are generated by tracing the path of rays sampled from a light source. Because the method follows how light actually behaves, it can produce hard shadows with a point light or soft shadows when using area lights or sampling many rays. It can also handle transparency by letting rays pass through partially translucent objects, attenuating the light accordingly. That combination—sampling rays from the light to determine occlusion—is what makes ray-traced shadows accurate and flexible compared with other shadow techniques, which is why the statement about their generation by tracing rays is the best description.