Firstly, a sincere thank you to Professor Weiqin Chen for her dedicated support throughout this process. Without her guidance, this thesis would never have happened.My colleagues at the department: Frode Guribye, who deserves a thank you for teaching me the extracurricular aspects of being an academic, Lars Nyre for his inspiring words and Kristine Jørgensen for the fruitful collaboration. The team at Bryggen Research, including Aleksander Krzywinski, Jørund Fjøsne and Martin Lie. Thank you for your constant encouragement and for bothering to listen to my arguments. My associates in the Augmented Reality Research Group: Jonas Waage, Ingerid Rødseth, David Burns, and Jan Andre Johnsen. Thank you for an exciting time developing and releasing ARad. My sister, Trude Meling, for going the extra mile and coming with me to India to keep me company while I presented a paper. My parents, Geir Olav Meling and Audny Gjøsaeter, for not asking, "How is the thesis work coming along?" over the last year, and just silently trusting it would eventually come to pass. The in-laws, Lars Magne Halleraker and Heidi Irene Vespestad, for their support.Lastly, but most importantly, I would like to thank Helga Marie Halleraker, my superior half. There comes a point in every thesis when you need someone to be there with you for the paper rejections, the acceptances, the fallbacks, the grind, and the eventual triumph. Thank you for the small things that make life worth living.