Swap between 2 face index

You want to use the .faceIndex value of a head binding component.

First import both of them,

//@input Component.Head headOne

//@input Component.Head headTwo

then setup a variable to know when it's switched.

var switch =  false

next, setup your tap event. I actually use Touch Start here because it detects taps faster.

var event = script.createEvent("TouchStartEvent");

event.bind(function(eventData)

{

// put code here

});

Then inside that you want to change the switch variable to its opposite and set the face indexes based on that:

switched = !switched

if(switched){

script.headOne.faceIndex = 1

script.headTwo.faceIndex = 0

} else{

script.headOne.faceIndex = 0

script.headTwo.faceIndex = 1

}

so the full script would be:

//@input Component.Head headOne

//@input Component.Head headTwo

var switched = false

var event = script.createEvent("TouchStartEvent");

event.bind(function(eventData)

{

switched = !switched

if(switched){

script.headOne.faceIndex = 1

script.headTwo.faceIndex = 0

} else{

script.headOne.faceIndex = 0

script.headTwo.faceIndex = 1

}

});

You may want to consider this to stop the camera from flipping if spamming tap:
https://lensstudio.snapchat.com/api/classes/TouchDataProvider/

References:
Head Binding Component

TouchStartEvent