Class SbTrackerInfo

  • public class SbTrackerInfo
    extends Inventor
    Class for representing 3D tracker information. An object that stores information about the state of a 3D tracker device, specifically position and orientation.

    A "tracker" is any device whose position and orientation are dynamically tracked in 3D, typically for immersive VR applications. For example: a head tracker. A "controller" is an input device which typically has buttons and/or valuators (e.g. a joystick). Many controllers have an associated tracker. For example, the commonly used "wand" input device has three buttons, a two-axis joystick (two valuators), and an associated tracker.

    The virtual method SoEvent.getTrackerInfo() can be used to determine if an event object has associated tracker information. Traditional 2D events like SoMouseButtonEvent and SoLocation2Event return NULL. 3D events like SoTrackerEvent and SoControllerButtonEvent return a pointer to their associated tracker information (SbTrackerInfo).

    In addition to the usual methods for setting an orientation, this class provides a method that takes three Euler angles specified in radians. This allows orientation information returned by the widely used trackd API to be stored directly into an Open Inventor event object.

    Tracker info is most often used by Open Inventor classes to specify a direction for picking or intersection with a dragger. This class provides the getRay() method to conveniently get an SbLine defining the direction the tracker is pointing.

    This class also provides a void * data member that could be used, for example, to distinguish different tracker devices or communicate any other information between an application and custom nodes in the scene graph. Open Inventor does not set or use this variable.

    See Also:
    SoControllerButtonEvent, SoEvent, SoTrackerEvent
    • Constructor Detail

      • SbTrackerInfo

        public SbTrackerInfo​(SbTrackerInfo copyFrom)
      • SbTrackerInfo

        public SbTrackerInfo()
    • Method Detail

      • setOrientation

        public void setOrientation​(SbVec3f axis,
                                   float angle)
        Set orientation value from axis and angle in radians.
      • toArray

        public static SbTrackerInfo[] toArray​(long nativeArray,
                                              long length)
      • setOrientation

        public void setOrientation​(SbRotation orientation)
        Set orientation value from an SbRotation.
      • getOrientation

        public SbRotation getOrientation()
        Get orientation of tracker as a standard Open Inventor rotation (quaternion).
      • setOrientation

        public void setOrientation​(float[] q)
        Set orientation value from array of 4 floats defining the rotation quaternion.
      • setOrientation

        public void setOrientation​(float q0,
                                   float q1,
                                   float q2,
                                   float q3)
        Set orientation value from 4 floats defining the rotation quaternion.
      • getRay

        public SbLine getRay()
        Convenience function to get ray for picking/intersecting.
      • setPosition3

        public void setPosition3​(SbVec3f p)
        Set position of tracker in world coordinates.
      • setOrientation

        public void setOrientation​(float xangle,
                                   float yangle,
                                   float zangle)
        Set orientation value from Euler angles in radians (using the trackd convention Z*X*Y).
      • getPosition3

        public SbVec3f getPosition3()
        Get position of tracker in world coordinates.