This tool is used to transform and deform the boundaries i.e. the unconnected edges of a mesh. The tool detects the mesh boundary closest to the active vertex and propagates the deformation using the brush Falloff into the mesh.
Even if this brush can produce deformations in triangle meshes and meshes with a non-regular quad grid, the more regular and clean the topology is, the better the result.
Brush deformation displaces the vertices of the mesh.
Brush deforms the mesh by deforming the constraints of a cloth simulation.
Applies the deformation in a localized area limited by the brush radius.
Applies the brush falloff in a loop pattern.
Applies the falloff radius in a loop pattern, inverting the displacement direction in each pattern repetition.
The main use cases of this brush are the Bend and Expand deformation modes, which depend on a grid topology to create the best results. In order to do further adjustments and tweaks to the result of these deformations, use the Inflate, Grab, Twist, and Smooth deformation modes, which do not depend that much on the topology.