skinCluster Geometry Influence

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Dilen Shah

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Mar 24, 2015, 7:01:27 AM3/24/15
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hey guys,

I am trying a test in API to get the weights of a skinCluster. So i get the influence objects from the skinCluster but how can i get geometry influences from that skincluster and its weights so i can save it separately?

import maya.OpenMaya as OpenMaya
import maya.OpenMayaAnim as OpenMayaAnim

skinCls = "skinCluster"
selList = OpenMaya.MSelectionList()
selList.add(skinCls)

mObj = OpenMaya.MObject()
selList.getDependNode(0, mObj)

skinFn = OpenMayaAnim.MFnSkinCluster(mObj)
infs = OpenMaya.MDagPathArray()
nInfs = skinFn.influenceObjects(infs)

So from this how can i get the geometry influences.

Thanks.

D.

Eduardo Grana

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Mar 24, 2015, 7:22:02 AM3/24/15
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Hello Dilen,

You can do soemthing like this afterwards...

for i in range(nInfs):
    print infs[i] #maya.OpenMaya.MDagPath to use it with other MFn s
    print infs[i].fullPathName() # |jnt_grp|skin_C_001__SKN to go with maya.cmds

Cheers,
Eduardo


D.

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Dilen Shah

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Mar 24, 2015, 8:55:43 AM3/24/15
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Hey Eduardo,

Thanks, well i already kinda did that, i was wondering something in maya api that can give me automatically joints and geometry separately as I couldnt find anything from MFnSkinCluster.

D.
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Eduardo Grana

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Mar 24, 2015, 9:51:16 AM3/24/15
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Hey Dilen,

I don't know if there is such thing, although it wouldnt be to many lines to filter things out...
but maybe the wiser guys in the group can help you out :)

Cheers!
Eduardo

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Joe Weidenbach

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Mar 24, 2015, 11:48:27 AM3/24/15
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As far as automatic, I don't know about that, but you can always run this on the returned MDagPaths:

geoInfs = []
for i in range(nInfs):
    inf = infs[i]
    if inf.hasFn(om.MFn.kMesh) or inf.hasFn(om.MFn.kNurbsSurface):
        geoInfs.append(inf)

That *should* get the geometry objects, although I haven't had the chance to test it.
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Dilen Shah

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Mar 24, 2015, 12:23:56 PM3/24/15
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Hey joe,

thanks for the reply, but i have already tried that and it works but the thing is lets say i add a mesh as influence but not as a geometry influence, it will give me the that object also as geometry influence.

I think i will work around this and get a better result and will post something once i get something solid.

thanks

D.
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Joe Weidenbach

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Mar 24, 2015, 6:27:33 PM3/24/15
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Hmm...I wasn't aware that you could have both mesh influences and mesh Transform influences at the same time in one skinCluster.  I thought it was "Use Components" or not, but for the entire cluster, not object by object.  If I'm wrong on that, let me know--I'd love to see how to set that up!  

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Dilen Shah

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Mar 25, 2015, 5:27:06 AM3/25/15
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Hey Joe,

Well the thing is, may be some instances you have a joint with a geometry as its shape and added to skinCluster as geometry influence, the main way to know if its added as geometry infleunce is to check the driver/base points attribute in skincluster and check which outMesh is connected into it.

So thats why i am trying to find a way to get all situations in one go which is proving a little difficult but could be possible. will keep posting my progress here once i get some substantial results.

D.
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Joe Weidenbach

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Mar 25, 2015, 11:20:15 AM3/25/15
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Ah, I gotcha there.  I've actually done that too, wasn't thinking of those :)
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