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Using this panel you can select a shape of source surface, and the degree of curve edges fuzziness.
On the right of the panel's name there are the 'Panel presets' and 'Reset to defaults' buttons. By using them, you can create, load and delete presets of the current panel, and reset the parameters to default values. For details on these options see Panel Presets.
 
 
Shape
 
This control allows you to choose the form of source surface - square or circle. Shape of source surface are most noticeable at the zero value of the Bending parameter. Select a required shape with a click or by pressing the Up or Down arrow keys.
 
Edge fuzziness
 
Using this option, you can blur a generated curve, thus making a blurred image in the output. This effect can be very useful to get a realistic generated image when it is necessary to smooth curve edges. You can change this parameter by entering a value from your keyboard in the field of the spin box, or using the Up and Down arrows. Also you can adjust edge fuzziness by moving the slider. To activate it, click on the arrow located on the right of the spin buttons.