gistfile1.js

var building = {}
building.properties = vt.layers.building.feature(i).properties;
building.geometry = vt.layers.building.feature(i).loadGeometry();
traverse(building.geometry).forEach(function(g){
    if(!Array.isArray(g) && typeof g.x === 'number') {
        var topLeft = tile;
        while(topLeft[2] < zoomEncoding){
            topLeft = tilebelt.getChildren(topLeft)[0]
        }
        var x = topLeft[0] + g.x
        var y = topLeft[1] + g.y
        var bbox = tilebelt.tileToBBOX([x,y,zoomEncoding])
        var lon = (bbox[0] + bbox[2])/2
        var lat = (bbox[1] + bbox[3])/2
        this.update([lon,lat]);
    }
});