Trackers and following

Setting up

Wear the tracker to use it, When attaches the red indictor light will come one, this confirms that the tracker has managed to contact the follow controller and is in proper communication.

All trackers have a unique identity, that identity os the key of the avatar wearing the tracker (or if it is a simple tracker script then the key of the object containing the script).  the controller and tracker together perform all necessary conversions between object / avatar names and their respective keys.  If you are brave you can do this yourself but it really is much better to let the controller manage the conversions.

To initiate a follow using the controller all that needs to be done is to select the name of the object or avatar to follow, select the light or lights to follow with and then to select the TRK command.  The selection of lights and name can be in any order.

it is possible to command the controller to set up a track using chat commands, This is useful if your not near the controller or if you want to embed a tracliing set up in a controller preset.  In this case the commands are:


follow <name> <group name>;

<name> is: if the target is an avatar the first part of a legacy user name or if the name is presented in dot format then the name to the left of, but no including the dot. if the target is an object then the name is the normal object name.

The basic command syntax is the same as the normal light syntax, commands can be combined on a single line and each command must bone terminated with a semi colon

Assuming that the control channel for the main controller is 12 then, for example:

/12follow gary FS;
will task lights in group FS to follow “gary”

/12follow oliver G1;
will task all liughts in group G2 o follow oliver


Cancel will clear a previously set follow task.

cancel <light group>;

Select one or more lights or light groups on the controller and press the VAN button, followed for those lights will be cleared. It is safe to clear follows on targets and lights on which no follow has been set, so as a safety exercise it is useful to select ALL lights on the controller and then press the CAN button to cancel all follows.

 Be Warned
selecting ALL and pressing TRK will tsk all lights and may not be the result you expected or required

Additionally, when a light has an active follow its green follow indicator will light and correspondingly if a tracker is acting as a follow target its green indicator light will also turn on.  For trackers, the cyan activity light will illuminate when the tracker transmits position and posture information.

Assuming that the controller command channel is 12 then:

/12cancel FS;
will clear all follows active on the FS light group

Background information

When a follow is set up either using the controller or manually, the controller allocates a control channel to be used by the tracker and the following lights, This channel is transmitted to the track and us then sued by the tracker for transmitting position information, in addition it is transmitted to the tasked lights so they know which channel to listen to.  It’s the receipt o this channel which enables both the track and the light to know when tracking is enabled and therefore when to turn on their green follow lights.  Sending channel 0 disables and tracking/

There are other tracker commands which can effect the performance of the light follow.  The whole system does its best to minimise the amount of data which is transmitted.  the tracker only transmits when the target actually moves or first starts to move or stops, for continues movement the tracker transmits at a defined rate, by default this is approximately 200mS.  In good sim conditions this can be reduced to typically 100mS to achieve closer and more smooth tracking.  Usually there are system resets on the controller to do this but this can also be set by hand using the interval command


This command sets the tracker position update interval.  Please note that the syntax of this command is different to most of=ther commands.

interval:<time interval>


time interval is the update interval, typically for fast updates – 0.1

Note there is no trailing semi colon and there is a colon between interval and the time. for example, if the tracker command channel is channel 13 then:

will change the update interval to 100mS


Trackers contain a one way intercom, specifically for shouting cues. this is most easily used win the headset, see headset


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