Remembering all the promising augmented reality demos you've seen 2009 when smartphones got popular? Fluent indoor navigation, interactive games, repairing your washing machine with the help of your smartphone? Why have all those promising apps never made it into reality? To find the answer we'll look at the challenges of augmented reality applications like camera tracking, lightning models, 3D occlusion and shadows, and how professional VFX studios tackle these problems in their movie productions. And we'll check how Google's Project Tango helps us getting augmented reality apps to work as they have been promised for a long time.