Lecture 7 - Content Positioning

Question 1

What is content positioning?

Answer 1

The frame of reference for the content to be placed.

Question 2

What are the 2 types of content positioning?

Answer 2

• egocentric
• exocentric

Question 3

What is egocentric?

Answer 3

relative to the viewer e.g. a menu is always palced 2m in front of user

Question 4

What is exocentric?

Answer 4

relative to the world in which the user is placed e.g. always in the corner of the room

Question 5

Advantages of egocentric positioning?

Answer 5

• mobile
• consistent as always in the same place
• user can always reach it

Question 6

Disadvnatages of egocentric positioning?

Answer 6

• not integrated with the environment, but the device
• content that appears might be obtrusive
• the content is single user only
• content can move with the user, so can jitter , unstable

Question 7

Advantages of exocentric positioning?

Answer 7

• integrated with the environment -> provides immersion.
• Can optimise presentation
• Can provide implicit haptics (display buttons on a table, so clicking the button is like tapping the table -> physical feedback)
• there is a shared frame of reference so it can collaborate with other objects

Question 8

Disadvantages of exocentric positioning?

Answer 8

• requires 6DOF (expensive and hard to get precise)
• limited access , content in a fixed location
• limited discoverability and reachability depending on where the content is rendered (maybe out of our sight? how do we know this?)

Question 9

Can we couple exocentric and egocentric together?

Answer 9

Yes, there are situations where both can be argued for.

e.g., AR display showing navigation directions: both