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This parameter allows you to control the degree of distortion of the source surface. At the minimum (zero) value, the surface is completely flat, at the maximum (100) value it is the most distorted. This option is very useful for creating various categories of images. For instance, at low bending values you will get different patterns in the output (the most suitable for wallpapers creating). At the average values of bending resulting images are often similar to logos/emblems. And at maximum distortion levels you can generate letters/numbers, drawings and even 3D images of different items.
 
 
You can change the value of bending using the slider in the range from 'flat' to 'plasma', or entering a value from your keyboard in the field of the spin box, or use the spin buttons included in the spin box.