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.
How the deformation of the brush will affect the object.
Brush deformation displaces the vertices of the mesh.
Brush deforms the mesh by deforming the constraints of a cloth simulation.
Deformation type that is used by the brush.
Rotates the active boundary around the local Y axis.
Moves/extends the mesh boundary in the local X direction.
Works similar to the Inflate tool but, the vertices that are inflated are constrained to the mesh boundary.
Works similar to the Grab tool but, the vertices that are grabbed are constrained to the mesh boundary.
Rotates the active boundary around the local Z axis.
Works similar to the Grab tool but, the vertices that are smoothed are constrained to the the mesh boundary.
How the brush Falloff is applied across the boundary.
Offset of the boundary origin in relation to the brush radius.
Applies the same deformation in the entire boundary.
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.