  Head Mounted Displays (HMDs) allow users to experience virtual reality with a
great level of immersion. However, even simple physical tasks like drinking a
beverage can be difficult and awkward while in a virtual reality experience. We
explore mixed reality renderings that selectively incorporate the physical
world into the virtual world for interactions with physical objects. We
conducted a user study comparing four rendering techniques that balances
immersion in a virtual world with ease of interaction with the physical world.
Finally, we discuss the pros and cons of each approach, suggesting guidelines
for future rendering techniques that bring physical objects into virtual
reality.
