import maya.cmds as mc
import maya.OpenMaya as om

def softSelection():
    selection = om.MSelectionList()
    softSelection = om.MRichSelection()
    om.MGlobal.getRichSelection(softSelection)
    softSelection.getSelection(selection)
    
    dagPath = om.MDagPath()
    component = om.MObject()
    
    iter = om.MItSelectionList( selection,om.MFn.kMeshVertComponent )
    elements = []
    while not iter.isDone(): 
        iter.getDagPath( dagPath, component )
        dagPath.pop()
        node = dagPath.fullPathName()
        fnComp = om.MFnSingleIndexedComponent(component)   
                
        for i in range(fnComp.elementCount()):
            elements.append([node, fnComp.element(i), fnComp.weight(i).influence()] )
        iter.next()
    return elements
    

def createSoftCluster():
    softElementData = softSelection()
    selection = ["%s.vtx[%d]" % (el[0], el[1])for el in softElementData ] 
    
    mc.select(selection, r=True)
    cluster = mc.cluster(relative=True)
    
    for i in range(len(softElementData)):
        mc.percent(cluster[0], selection[i], v=softElementData[i][2])
    mc.select(cluster[1], r=True)
    
createSoftCluster()