in src/Layer/NativeMetaballs/NativeMetaballs.js [310:318]
function setupMetaballs() {
metaballsObjects = config.metaballs;
var metaball;
for (var i = 0, total = metaballsObjects.length; i < total; i++) {
metaball = metaballsObjects[i];
metaball.ox = metaball.x = (displayWidth * metaball.offset.x) + metaball.center.x * scale;
metaball.oy = metaball.y = (displayHeight * metaball.offset.y) + metaball.center.y * scale;
}
}