Shading

Question 1

What is Flat (constant) shading?

Answer 1

1. Take one vertex of the triangle
2. Then use the Local Illumination Model to work out a colour
3. Apply that colour to every pixel in the polygon

Question 2

What are the disadvantages of Flat Shading?

Answer 2

• can clearly see the shape of the mesh
• Mach Band Effect, makes areas seem darker and brighter at the boundaries of a change in intensity

Question 3

How do Phong and Gouraud Shading differ?

Answer 3

Gouraud interpolates colours

Phong interolates normal vectors

Question 4

Which shading method averages out Specular Reflection?

Phong or Gouraud

Answer 4

Gouraud