BSCS Bachelor of Science in Computer Science: Computer Graphics Fundamentals Questions 2

Question 1

Which shading model computes illumination at each vertex and interpolates colors across a polygon?

Accepted Answer

Gouraud shading

Answer

Gouraud shading interpolates per-vertex lighting across the polygon surface, producing smoother results than flat shading.

Question 2

In homogeneous coordinates, what does the w-component equal to 0 represent?

Accepted Answer

A point at infinity (direction vector)

Answer

A homogeneous coordinate with w=0 represents a direction vector or point at infinity rather than a finite point.

Question 3

What is the purpose of the z-buffer algorithm in 3D rendering?

Accepted Answer

Depth sorting for correct occlusion

Answer

The z-buffer stores the depth of the closest fragment at each pixel, ensuring correctly occluded surfaces are hidden.

Question 4

Which transformation preserves angles and ratios of distances along parallel lines?

Accepted Answer

Affine transformation

Answer

Affine transformations (translation, rotation, scaling, shear) preserve parallelism and ratios of collinear distances.

Question 5

In Bezier curves, what role do control points that lie OFF the curve play?

Accepted Answer

They attract the curve toward them without the curve passing through

Answer

Off-curve control points act as magnetic attractors, pulling the Bezier curve toward them without requiring the curve to interpolate those points.

BSCS - Bachelor of Science in Computer Science Practice Test