Object Properties
You can use the input box(es) to change the deformer’s dimension(s).
Different modes for deformation.
There are three modes for bulge deformation: Limited, Within Box and Unlimited.
The entire object is affected. Surfaces at a height between the top and bottom of the (undeformed) cyan box are bulged and the other surfaces are translated if necessary to accommodate the bulge. In the example, the result is the same as Within Box. However, the effect differs when the bulge deformer is moved or rotated.
Surfaces within the (undeformed) cyan box bulge. Surfaces outside the box remain exactly where they are (they are unaffected).
The entire object bulges.
Strength [-10000000..10000000%]
Defines the strength of deformation. To change this value interactively, drag the orange handle in the viewport.
This value affects the curvature of the deformer.
If this option is enabled, the deformation is softened near the top and bottom.