如何把 soft selection 轉換成 cluster

很多時候 做臉部表情的 rig 時都會需要用到 cluster 來控指變形範圍或當 constraint 使用. 以下的程式可以把 polygon 的 soft selection 轉換成一個 cluster. 個人是覺得還蠻好用的,所以在此分享給大家. 這段程式是從 這網頁 轉貼過來的, thanks to THNKR for providing the code.

轉換程式:

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

richSel = om.MRichSelection()
richSelList = om.MSelectionList()

om.MGlobal.getRichSelection(richSel)
richSel.getSelection(richSelList)




cluster = mc.cluster( rel=True )
clusterSet = mc.listConnections( cluster, type="objectSet" )

for idx in range(richSelList.length()):
    dag = om.MDagPath()
    component = om.MObject()
    richSelList.getDagPath(idx, dag, component)
    componentFn = om.MFnSingleIndexedComponent(component)

    meshName = dag.partialPathName()
    
    for cidx in range(componentFn.elementCount()):
        weight = componentFn.weight(cidx)
        v = componentFn.element(cidx)
        w = weight.influence()
        vtx = (meshName+'.vtx[%d]') % v
        mc.sets(vtx, add=clusterSet[0])
        mc.percent(cluster[0], vtx,  v=w )

mc.select(cluster)

這是個 python 程式, 所以要貼在 script editor 裡的 python tab 裡, 然後可以用 File->Save Script to Shelf 把它存成一個 shelf 按鈕.