Shading

Question 1

Shading is

Answer 1

Variation in brightness due to changes in surface orientation

Question 2

Shape from shading is

Answer 2

Recover the shape of a surface based on intensity variation

Question 3

Photo metric stereo

Answer 3

Single viewpoint, multiple images under different lighting effects

Question 4

Radiometry

Answer 4

How bright will surface be?

Thinking about how light will arrive at a surface

Question 5

Foreshortening

Answer 5

The projection looks smaller as it’s rotated out of plane

Question 6

Solid angle

Answer 6

Area of unit sphere intersected by the cone

If I’m a point solid angle tells me how much I can view

Question 7

Radiance, L

Answer 7

Power emitted from surface patch

Radiance is constant along a straight line

Question 8

Irradiance, E

Answer 8

Power falling on a surface patch

Function of incoming angle

Question 9

Reflectance

Answer 9

The way light interacts with a surface

Is a whole Corel’s go study on its own

Question 10

What can happen when a light ray hits an object?

Answer 10

Absorbed
Transmitted through
Reflected

Question 11

Bidirectional reflectance distribution function BRDF

Answer 11

Ratio of radiance in the outgoing direction to the incident irradiance

Tells how bright a surface appears when viewed from one direction while light falls on it
From another

Question 12

Surface reflectance

Answer 12

Diffuse reflection
Matte appearance

Specular reflection
Mirror like

Albedo of surface (reflection coefficient)

Question 13

Diffuse surface reflection

Answer 13

Lambertian surfaces, reflect uniformly

Question 14

Specular surface reflection

Answer 14

Phony’s model of specular reflection