In this chapter, we explored the ways in which a user can interact with holograms; we started by looking at how we can use the navigation and manipulation gestures to control the robot arm, and extended this further by looking at how we can allow the user to actually touch the hologram. We did this by tracking the user's hand and responding to collisions with the hologram.
In the last part, we explored two approaches to integrating voice into your application, one that dealt with simple phrases, and the other using SRGS to handle more complex (and natural) phrases. We have covered a lot in this chapter; focusing on two interaction paradigms, gestures and voice, and explored how we might use them to deliver a more intuitive experience for the user to interact with the virtual world. In the next chapter, we will explore one of the pinnacle use cases of HoloLens--collaborative workflows. In other words we will be, looking at how we can share the same content between two users.