Travel techniques

Before we begin to walk in virtual environment we must choose appropriate travel method. At first, we must determine if our tour will be driven by some goal of motion, where we want to transfer, or we just choose a direction of our motion. Then we must set speed/acceleration with which we will move. And finally, we must declare input conditions that specify beginning, duration and end time of travel motion.

Taxonomy of travel techniques can look like for example in this way [1].

1. Direction/Target Selection
   • Gaze-directed steering
   • Cross-hairs mode
   • Pointing/gesture steering (including props)
   • Discrete selection

     -

     Lists (eg. menus)

     -

     Environmental/direct targets (objects in the virtual world)

   • 2D pointing
2. Velocity/Acceleration Selection
   • Constant velocity/acceleration
   • Gesture-based (including props)
   • Explicit selection

     -

     Discrete (1 of N)

     -

     Continuous range

   • User/environmental scaling
   • Automatic/adaptive
3. Input Conditions
   • Constant travel/no input
   • Continuous input
   • Start and stop inputs
   • Automatic start or stop