code: function addLine(lat,lon,el, color) {
          var poly = new amino.Polygon();
          var pt1 = latlon2xyz(lat,lon,radius);
          var pt2 = latlon2xyz(lat,lon,radius+el);
          var pt3 = latlon2xyz(lat,lon,radius);
          var points = pt1.concat(pt2).concat(pt3);
  
          poly.fill(color);
          poly.geometry(points);
          poly.dimension(3);
          group.add(poly);
      }
docs: NOTE: on Raspberry pi we can't just make a line. A polygon needs at least two segments.