Multiple Target tracking help!

Colin Tucker

Snap Lens Network Member Lens Studio Team

November 05, 2019 16:28

Hey mods/nice community of lens creators,

I am trying to create a lens for a video that uses multiple marker targets in one lens that are synced with a video. Apoc showed me a script that allows for this to happen but I am having trouble triggering a particle system and a 3d model at different times... please if anyone can help me modify this script to allow this I would be eternally grateful!!

//@input Component.MarkerTrackingComponent m1
//@input Component.MarkerTrackingComponent m2


var event = script.createEvent('UpdateEvent')
event.bind(function(eventData) {
  if (script.m1.isTracking()) {
    // do stuff
  }
  if (script.m2.isTracking()) {
    // do stuff
  }
})

Thanks again!

rashed almansoori
Snap Lens Network Member Lens Studio Team

November 06, 2019 20:30
hi Colin Tucker

It is beautiful for the lens I will look for it and if you see its way I will help you in that

thank you
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Jacob
Snap Lens Network Member Lens Studio Team

November 07, 2019 23:46

Edited
Hi Colin,

Have you tried using Behavior script? You can set the trigger type to "Marker Tracking Event" and set the Marker Tracking component you want to respond to. Then you can set the delay time to cause something to happen that long after the marker is found. See more about Behavior script here: https://lensstudio.snapchat.com/guides/scripting/helper-scripts/behavior/

If you need more advanced behavior, you can write your own script that causes things to happen after a delay. Here's a really simple example:
//@input Component.MarkerTrackingComponent m1

script.m1.onMarkerFound = function() {
    // This will happen right away
    print("Marker Found");

    delayedCall(function() {
        // This will happen after 2 seconds
        print("2 seconds since marker found");
    }, 2.0);

    delayedCall(function() {
        // This will happen after 5 seconds
        print("5 seconds since marker found");
    }, 5.0);
}

function delayedCall(func, delay) {
    var evt = script.createEvent("DelayedCallbackEvent");
    evt.bind(func);
    evt.reset(delay);
    return evt;
}

And you can do the same thing for a second marker tracker too. Just keep in mind that if the marker is lost you might want to cancel all the pending delayed events. You can track them in a list and remove each one with script.removeEvent() when the object is lost if you run into this.

Let me know if you need more help!

Jacob
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Multiple Target tracking help!

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