This makes a layer move in an ellipse around it's position.
Putting zero for either value creates a simple Sine oscillation.
(left/right or up/down)
-----paste below code into Position expression-----
//--OSCILLATE LAYER IN AN ELLIPSE--//
//USER ADJUSTED:
radiusDistX = 30; //set to zero for up/down oscillation
radiusDistY = 100; //set to zero for sideways oscillation
period = 1;
// DON'T ADJUST
value + [Math.sin(time*period)*radiusDistX,
-Math.cos(time*period)*radiusDistY]
-----------------end code-------------------------
Antifreeze Design {blog} 