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Augmented Reality for Android Application Development by Dr. Raphael Grasset, Jens Grubert

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Advanced interaction techniques

In the preceding chapter, we looked at some simple interaction techniques, that included ray picking (via touch interaction), sensor interaction, or camera to target proximity. There are a large number of other interaction techniques that can be used in Augmented Reality.

One standard technique that we will also find on other mobile user interfaces, is a virtual control pad. As a mobile phone limits access to additional control devices, such as a joypad or joystick, you can emulate their behavior via a touch interface. With this technique, you can display a virtual controller on your screen and analyze the touch in this area as being equivalent to controlling a control pad. It's easy to implement and enhance the ...

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