This control is used to position the center of the Vortex effect on the image. The default is 0.5, 0.5, which positions the effect in the center of the image.

Change the area effected by the Vortex in the display window by dragging the circumference of the effect or by using the Size slider.

Drag the rotation handle on the display or use the screw control to change the amount of rotations in the Vortex. The higher the angle value, the greater the swirling effect.

Increasing the Power slider makes the Vortex smaller but tighter. It effectively concentrates it inside the given image area.