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Simulate Live Data in Vuforia Studio using Java Script


Simulate Live Data in Vuforia Studio using Java Script

I am looking to change the data in a 3D gauge using Java Script to simulate live data. Any suggestions?


Hi @dallen3 ,


here a very simple example simulating a value:

So following demo project :




In this project I have a 3D gauge "3DGauge-1" and application parameter RPM

Then added the following script:



////////simulate properties
 //this will set the applicaiton parameter "RPM" to random value between 1-100
 function setRPMValue()
   var  retValue  = Math.floor(Math.random() * 100)+1
   $['RPM']= retValue;
//print in the debugging consol  
console.log("rpm callback to value="+retValue)
//will call this function every 1 sec
var timerId= setInterval(setRPMValue,1000,true)
//////// watch construct which watch the change of the app parameter "RPM"
  { return $['RPM']; }
  { //set the value of the gauge
$scope.view.wdg['3DGauge-1']['text']= $['RPM']


The code will change the value of the application parameter RPM to random value in range 1-100 

The interval callback will call the  setRPMValue function every 1 sec

The $watch construct will bind the value to the gauge text property. Of course, you can use direct binding from application parameter "RPM" to 3DGauge-1 .text. In this case the $watch construct is not required e.g:





Additionally, you can add a filter for example to use some units in the display.  About detail for using a binding filter you can see the topic: “Using Connection Filters for state-based rendering and value formatting”


Great and thank you!

The app only seems to update the values when touching the screen. Is there a feature I'm missing?

- do you mean that the problem with the value update occurs on end device? Mobile device? What kind of device is it?

-what is the behavior in preview? 

May be this is only a problem of the dispaly update and could depends on the particular implementation. 

So one option could be  to use setWidgetProp function instead of direct setting:

  { return $['RPM']; }
  { //set the value of the gauge
   $scope.setWidgetProp('3DGauge-1', 'text', $['RPM']); 
   //$scope.view.wdg['3DGauge-1']['text']= $['RPM']


We test on Apple(ipad pro) and Android(galaxy s9). We were able to get auto updates by associating the application parameter(RPM) with a place holder PLC tag in the external data that was set to auto-update.


The values act the same in preview. "RPM" were set to replace 'text' for a 3D-gauge and label. 


The script was tested as given with no changes. While the app is currently functional by using the external data, we would prefer to have the app driven by scripting with the $watch construct.

Hi @ForrestA ,


thanks for the feedback!

Unfortunately for me from your last comment  is not quite clear ,if your issue still exist or is already solved.

In case that the issue still exist, could you, please, provide an example:

e.g.  code js and short screen from the external area where I could understand and reproduce the problem to be able to perform further tests on IOS IPad.


The issue was solved. 

The widget that showed the data needed to be linked to an event that auto-refreshed. 




I am facing the same issue as I am unable to see the updated random values in 3d Gauge although it is being displayed in the logger. We need to manually click on gauge every now and then to see the updated values.


How have you auto-refreshed the data of 3d Gauge widget as there is No Auto-refresh event is being provided in Vuforia?



Hi @ranjank ,


so far, I know for the gauge is no direct update service as we know for the chart

There could be 2 strategies to update:

- set the value to an application parameter and created binding to the gauge:




or you can call after setting of the property the  $applyAsync function - example:


let RandValue= parseInt(Math.random()*90+1)
$; //set the model gauge
$['GAUGEANGLE']=RandValue //set the parameter

 I attached also a simple Vuforia Studio  project as example:


I added in the example also the Gauge 3D Svg widget(refer to  CS321903 for this extension - widget):


also attached here the updated demo project.

I am not able to deploy the example project into my hololens from vuforia studio, does anyone know how to do that? avast driver jiofi.local.html

Hi @CF_9790064 ,

what is your requirment here?

Do you  want to have the attached demo project in my previous post "3dGaugeExampleMODandWidget (1).zip" (which is mobile project) as eyewear project? Or what is required?

So converted - so far as possible the mentioned  project to HoloLens project and attached it to this post. When I tested in preview it looked like this below:


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