You can create a deformer and pipe in the worldMesh attribute into a plug
that accepts meshes. Then just set the points in the deformer. Since
you're piping in the worldMesh attribute, you don't need to worry about any
dagPath.
oMesh = data.inputValue(aInWorldMesh)
inPoints = OpenMaya.MPointArray()
fnInMesh = OpenMaya.MFnMesh(oMesh)
fnInMesh.getPoints(inPoints)
# 2008
while not iter.isDone():
iter.setPosition(inPoints[iter.index()])
iter.next()
# 2009
iter.setPositions(inPoints)
On Sat, Jun 13, 2009 at 9:39 AM, jasonosipa <[email protected]> wrote:
>
> Hi All!
>
> Thanks for the responses. These are great ideas, but not what I am
> looking for. There are a number of ways to get this effect done, and
> in fact, I already had 2 different ones before posting - what I really
> *want*, isn't a way to get it done, so much as to learn specifically
> how to use this line:
>
> outFnMesh.setPoints( outPoints, om.MSpace.kWorld )
>
> So that it doesn't give me this:
>
> // Error: (kInvalidParameter): Must have a DAG path to do world space
> transforms
>
>
> By accepting a "space" at all, it just seems like there is probably a
> way already built in to MFnMesh.setPoints to do this that doesn't
> involved manually math-ing away the destination world matrix. Right?
>
>
>
>
>
> On Jun 12, 11:45 pm, Nicolas Combecave <[email protected]>
> wrote:
> > Hello Jason,
> >
> > I don't know if you need to implement your own deformer for that, or if
> it's
> > part of something more complex, but I think that the effect you're after
> is
> > like what a blendShape does, with attribute "origin" is set to world...
> >
> > Nicolas
> >
> > On Sat, Jun 13, 2009 at 8:21 AM, Paul Molodowitch <[email protected]
> >wrote:
> >
> >
> >
> > > I suspect that you would have to have the worldMatrix fed in as an
> > > additional input attribute.
> >
> > > The basic problem, though, is that 'worldSpace' is always relative,
> > > and I'm not sure what you want it relative to. Since it seems like
> > > you want this shape "echoed" in multiple spots in the dagTree, each
> > > eventual "output" destination in the dag would have to feed this node
> > > it's world matrix (or, more likely, it's inverse world matrix) into
> > > some sort of 'destinationWorldMatrices' multi attribute, and then read
> > > out the shape node from a corresponding plug in a 'outputShapes' multi
> > > plug.
> >
> > > If this doesn't make sense, I can offer a fuller description...
> >
> > > - Paul
> >
> > > On Fri, Jun 12, 2009 at 3:20 PM, jasonosipa<[email protected]>
> wrote:
> >
> > > > Hi guys!
> >
> > > > I'm trying to push the global vert positions of one mesh to that of
> > > > another. Essentially, no matter what I do with either transform, I
> > > > want the shape on the second to always look exactly the same as that
> > > > of the first (in world space). That's it. Another way to describe
> it
> > > > would be to say - I just want the two objects to be the same, all the
> > > > time. I'm getting stumped though, in that it seems I need a dag path
> > > > for world space output, and I'm not sure how to get that given the
> > > > inputs/outputs I'm working with. Any ideas? Thanks in advance! -J.
> >
> > > > class noMovey( omMPx.MPxNode ):
> >
> > > > aInShape = om.MObject()
> > > > aOutShape = om.MObject()
> >
> > > > def __init__ ( self ) :
> > > > omMPx.MPxNode.__init__( self )
> >
> > > > def compute( self, plug, data ):
> >
> > > > inMesh = data.inputValue( noMovey.aInShape ).asMesh()
> > > > inFnMesh = om.MFnMesh( inMesh )
> > > > ins = om.MPointArray()
> > > > inFnMesh.getPoints( ins, om.MSpace.kWorld )
> >
> > > > outPoints = om.MPointArray( ins )
> >
> > > > outFnMeshData = om.MFnMeshData()
> > > > outMeshData = outFnMeshData.create()
> > > > outFnMesh = om.MFnMesh()
> > > > outFnMesh.copy( inMesh, outMeshData )
> >
> > > > outFnMesh.setPoints( outPoints, om.MSpace.kWorld ) # Maya no
> > > > likey
> >
> > > > data.outputValue( noMovey.aOutShape ).setMObject( outMeshData )
> > > > data.setClean( noMovey.aOutShape )
> >
> >
> >
>
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