settings.json file. To do this, open this file in any text editor, e.g. Notepad++.
settings.json file sets the parameters of the server and the location where the tracking data will be sent.
This is the IP address of the device the tracking data will be sent to. The default value is
127.0.0.1 — the data is sent to the same device where the utility is running. You can write an IP address of another device inside the network instead of this value.
A port of the device that will collect tracking data. The default value of
40000 is the default port in UnrealEngine. You can copy the port number from the application you're using.
The frequency of sending data packets per second. You can set a value higher than
100 if your application can receive and process that many packets per second.
This parameter specifies data addressing to one device or all devices inside the network. The default value is
false — this is a Unicast mode, i.e. sending data to only one device. The
true value paired with the
"ip": "xxx.xxx.xxx.255" parameter is used for the broadcasting mode. The
xxx.xxx.xxx part is the first 3 octets of the network the tracking data should be sent to. For example,
192.168.0.255 is used to send data to all devices in the
You should specify the camera's ID as a decimal integer in the
0..255 range. The camera's ID for each tracker should be unique.
Extrapolation time in seconds. A positive value is an extrapolation into the future, a negative one – into the past. The more this value differs from 0, the less reliable the extrapolation result will be. In most cases, a value of
0.00 or a negative value is used, since the tracking data stream is usually ahead of the camera video stream. You can find the optimal extrapolation time during your tests.
If the recipient program has a tracking/video delay setting, then you can use
"extrapolationTime": 0.00 and adjust the delay in the recipient program, for example, in Aximmetry or UE. This will make it easier to find the right value.
This is the Alt's position relative to the pivot point of the camera (entrance pupil of a lens) or a tracked object, i.e. its Placement. If the value is empty, the default Placement in AntilatencyService will be used. To set the code for the current Placement, select or create the current Placement in AntilatencyService, click on the " ⋮ " sign next to its name, and then click
Copy link. Paste the link as the value of the placementCode parameter and remove excess information, leaving only the Placement code (the value between data= and &name). Here’s an example of a link where the Placement code is highlighted: http://www.antilatency.com/antilatencyservice/placement?data=
This is the code of the used IR layout tracking area, the Environment. If the value is empty, the default Environment in AntilatencyService will be used. To set the code for your Environment, select the current Environment in AntilatencyService, click on the " ⋮ " sign next to its name, and then click
Copy link. Paste the link as the value of the environmentCode parameter and remove excess information, leaving only the Environment code (the value between data= and &name). Here’s an example of a link where the Environment code is highlighted: http://www.antilatency.com/antilatencyservice/environment?data=
AntilatencyFreeDServer.exe file. In our case with the settings file for two cameras, the app displayed the following information:
AntilatencyFreeDServer.exe crashes immediately after the application is launched.
There is an error in JSON punctuation or some parameter has an invalid value. Check the settings.json file and fix the error.
The AntilatencyFreeDServer.exe application window only displays the first AntilatencyFreeDServer <SDK version> message, no tracker information appears.
No nodes with Alt Tracking Task support found is the last message in the console.
Insert an Alt into the connected socket.
Failed to create placement from code "..." with error need VersionConverter implementation is the last message in the console.
In the settings.json file, the placementCode parameter of one of the trackers has an incorrect Placement code (with errors). Copy the Placement code (Placement data) from AntilatencyService to the settings.json file again.
Failed to create environment from code "..." with error need VersionConverter implementation is the last message in the console.
In the settings.json file, the environmentCode parameter of one of the trackers has an incorrect Environment code (with errors). Copy the Environment code (Environment data) from AntilatencyService to the settings.json file again.
While the main application is running, one camera is dependent on another. They try to take the same position ignoring their actual coordinates.
In the settings.json file, some trackers have the same value in the cameraId parameter. Fix it giving a unique number in cameraId for each tracker.