Question

Concerning phong shading and gouraud shading in a 3d scene, which of the following statements are true?

(a) gouraud shading requires more computation than phong shading.
(b) gouraud shading linearly interpolates the color of an interior pixel from the color at the vertices.
(c) phong shading interpolates over the normal vectors specified at the

(A) (a) and (b) only
(B) (a) and (c) only
(C) (b) and (c) only
(D) (a), (b) and (c)

Answer 1

Option D: Gouraud shading and Phong shading have different calculation processes and interpolation techniques. Gouraud shading requires more computation, while Phong shading interpolates over the normal vectors at the vertices.

Step-by-step explanation:

Gouraud shading requires more computation than Phong shading. Gouraud shading calculates the average normal at each vertex and then interpolates the color of the interior pixels linearly from these averaged values. On the other hand, Phong shading calculates the normal at each pixel, resulting in more computations.

Therefore, statement (a) is true.

Statement (b) is also true. Gouraud shading does linearly interpolate the color of an interior pixel from the color at the vertices.

Statement (c) is true as well. Phong shading interpolates over the normal vectors specified at the vertices.

Gouraud shading requires more computation, while Phong shading interpolates over the normal vectors at the vertices. Gouraud shading requires more computation than Phong shading. Gouraud shading calculates the average normal at each vertex and then interpolates the color of the interior pixels linearly from these averaged values. On the other hand, Phong shading calculates the normal at each pixel, resulting in more computations.Based on the above explanations, the correct answer is (D) (a), (b), and (c).