Soft Drag is a tool preset that consists of the Move tool combined with Screen Falloff. This lets you select vertices, edges or polygons and drag them, affecting their neighbors to a greater or lesser degree based on screen falloff. Use the right-mouse button to define the screen falloff circle.
You can access Soft Drag from the Deform tab of the MODO Tools toolbar, or from the menubar by choosing Edit > Deform > Soft Drag.
Turn the Transparent button on in the Screen Falloff section to allow the Soft Drag selection to happen through the mesh. With this off, only geometry facing the view will be affected.
