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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 vertices. Choose the correct answer from the options given below:

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 vertices. Choose the correct answer from the options given below: Correct Answer (B) and (C) only

The correct answer is option 3.

Key Points

Statement 1: FALSE: 

Gouraud shading requires less calculation and this greatly decreases the cost of shading steeply. 

Statement 2: TRUE:

Gouraud shading linearly interpolates the color of an interior pixel from the color at the vertices. The original paper makes it clear Gouraud shading is a linear interpolation of colour between vertices, specifically.

Statement 3:TRUE:

Phong shading interpolates over the normal vectors specified at the vertices.

∴ Hence the correct answer is (B) and (C) only.

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