In location based AR, I am not able to walk around the 3-D model. about ar.js HOT 7 OPEN

I forgot to mention, you can always put some logs into your gps-camera-update-position to see when it's firing and how accurate it is. Here's a function for measuring the distance in meters between two sets of coordinates, it may help you in debugging.

  function measure(lat1, lon1, lat2, lon2) {
    // generally used geo measurement function
    var R = 6378.137; // Radius of earth in KM
    var dLat = (lat2 * Math.PI) / 180 - (lat1 * Math.PI) / 180;
    var dLon = (lon2 * Math.PI) / 180 - (lon1 * Math.PI) / 180;
    var a =
      Math.sin(dLat / 2) * Math.sin(dLat / 2) +
      Math.cos((lat1 * Math.PI) / 180) *
        Math.cos((lat2 * Math.PI) / 180) *
        Math.sin(dLon / 2) *
        Math.sin(dLon / 2);
    var c = 2 * Math.atan2(Math.sqrt(a), Math.sqrt(1 - a));
    var d = R * c;
    return d * 1000; // meters
  }

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I don't think this is anything to do with the Southern Hemisphere, but possibly inherent limitations in the sensors of specific devices and/or iOS-related bugs. Perhaps related to #547 #552 #590? We haven't yet identified a definite cause as the occurrence is rather random, which suggests it's a device-specific issue.

GPS only has a certain accuracy though, being able to "walk around" a model on GPS alone is unlikely to work as GPS isn't that accurate.

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0.0001 degrees to the north is about 11 meters, so not much, if I had to guess it's simply because your GPS isn't updating your position because you're not walking very far? The cameras position can only be updated as the GPS is updated, if your GPS is relatively inaccurate then it's not going to pick up changes of only 11m. I know my current AR.js project is in a skyscraper so GPS is practically useless thanks to the interference and I had to put in a system for changing simulated coordinates.

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any good news ?!

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0.0001 degrees to the north is about 11 meters, so not much, if I had to guess it's simply because your GPS isn't updating your position because you're not walking very far? The cameras position can only be updated as the GPS is updated, if your GPS is relatively inaccurate then it's not going to pick up changes of only 11m. I know my current AR.js project is in a skyscraper so GPS is practically useless thanks to the interference and I had to put in a system for changing simulated coordinates.

I really dont think this is the issue as I tried changing those values

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any good news ?!

All I could understand was there were some issues with Southern hemisphere, for more info #278

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It's normal, you can't walk around a model.

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