TU Wien:Virtual and Augmented Reality VO (Kaufmann)/Prüfung 2021-02-18

1. Latency, Update Rate and Phase Lag [6 p.]

1. Plaese explain Latency, Update Rate and Phase Lag of a tracking system. [2 p.]
2. What effects can it have on humans if tracking is slow or if phase lag is large? [2 p.]
3. What are advantages and disadvantages of time-of-flight tracking? [2 p.]

2. Infrared tracking [5 p.]

How does infrared optical marker tracking with passive markers work? Which steps are needed from calibration to output of position and orientation of the target constellation? Briefly describe the 6 steps that are needed to track targets (as explained in the lecture for iotracker).

3. Stereo [7 p.]

1. What is active and passive stereo? [1 p.]
2. Which types of polarization exist? Why is polarization used? [2 p.]
3. How does a passive stereo projection setup look like and what is the required hardware for projection (for example in a 3D cinema)? [2 p.]
4. Which auto-stereoscopic display technologies do you know? Describe them briefly. [2 p.]

4. Depth cameras, haptic devices [5 p.]

1. Explain the three different technologies that can be used to get a depth image with a single depth camera. [3 p.]
2. What is a haptic device? Give an example for a haptic device and describe one possible application for it. [2 p.]

5. Magnetic / Natural Feature Tracking [4 p.]

1. Explain the principle of magnetic tracking. [2 p.]
2. What are disadvantages of Natural Feature Tracking? When/why does it fail? [2 p.]

6. Interaction [6 p.]

1. What are the universal interaction tasks? Briefly describe each. [3 p.]
2. Which interaction techniques for Manipulation in 3D do you know? Give 3 examples for manipulation techniques. [3 p.]

7. Immersion, Presence, Ray-Casting [5 p.]

1. What is Immersion? What is Presence? Explain both terms and give an example for a fully immersive environment. [3 p.]
2. How does the Ray-Casting interaction technique work? What is the purpose of this technique and what are advantages and disadvantages? [2 p.]