Getting close to a target object, e.g. here latest added PDF, makes it grow for any avatar within a 5m radius

hubs_proximity_avatar_scale_trigger.js

var avatars = document.querySelectorAll("[networked-avatar]")
var PDFs = AFRAME.scenes[0].querySelectorAll("[media-pdf]");
var mostRecentPDF = PDFs[PDFs.length-1]
if (scalingTrigger) clearInterval(scalingTrigger)
var scalingTrigger = setInterval(nearbyAvarScaleUp, 300)

function nearbyAvarScaleUp(){
  for (var avatar of avatars) {
    var dist = mostRecentPDF.object3D.position.distanceTo( avatar.object3D.position)
    if (dist<5) mostRecentPDF.object3D.scale.addScalar( 0.1 ) 
  } 
}