5.Viewing 1: The camera

Question 1

What are the four transformations that are applied to the model?

Answer 1

MVPJ: Modelling, Viewing, Projection and Viewport

Question 2

What is the default OpenGl View?

Answer 2

Orthogonal (projectors parallel to z axis)

p,q,r) -> (p,q,0

Question 3

Is a perspective view possible in OpenGl?

Answer 3

No, we predistort the objects before they are orthogonally mapped

Question 4

What is meant by the “duality” of modelling and viewing?

Answer 4

The effect of moving the model in a particular way can also be achieved by moving the camera in a particular way

Question 5

Describe the camera’s coordinate system.

Answer 5

F = E - C
V= up direction (user)
S = FxV

U = FxS

Question 6

How to derive Tc^-1

Answer 6

Tc^-1 =align with world axes * move SUF to origin