On Thursday, January 29, 2015 at 9:11:14 AM UTC-5, Enrico Losavio wrote:
> So.. thanks everyone for the replies.
>
>
> I managed to acced the data I was looking for. It was just a bit hidden and
> not-so-easy to read.
> Since I haven't found a solution for this problem on the internet yet, i post
> mine here.
>
>
> Given that (as written in the blendShape node documentation)
> inputGeomTarget ... stores the The target geometry input ... (type: geometry)
> inputPointsTarget ... stores the Delta values for points in a target geometry
> ... (type: pointArray)
> inputComponentsTarget ... stores the Component list for points in a target
> geometry ... (type: componentList)
>
> and that maya APIs dont have any convenient method to access this data, I
> decided to used MPlugs to reach these attributes.
>
>
> If the shape target object is still connected to the blend shape node, you
> can simply use the MFnBlendShapeDeformer.getTargets() method
> If the shape target object has been deleted or disconnected, then the
> inputGeomTarget attribute will be empty, and you will have to find a way to
> combine the two remaining attributes.
>
>
> The code below retrieve this data (in this case just for the first target in
> the bsNode) and prints it out. I guess that, properly combined together, this
> data gives you a lot of control over what's happening inside the node,
> especially when dealing with complex rigs!
>
>
> Hope this helps!
>
>
> ps. let me know if you have any comment or suggestion...
>
>
>
> Enrico
>
>
>
>
>
>
> import maya.cmds as cmds
> import maya.OpenMaya as OM
>
>
> # gets the blendShape node MObject
>
>
> bsNodeName = 'blendShape1'
> bsNodeObj = OM.MObject()
> sel = OM.MSelectionList()
> sel.add(bsNodeName, 0)
> sel.getDependNode(0, bsNodeObj)
>
>
> # gets the plug for the inputTargetItem[] compound attribute and ...
>
>
> dgFn = OM.MFnDependencyNode(bsNodeObj)
> plug =
> dgFn.findPlug('inputTarget').elementByPhysicalIndex(0).child(0).elementByPhysicalIndex(0).child(0).elementByPhysicalIndex(0)
>
>
> # if connected, retrieves the input target object and queries his points
>
>
> if plug.child(0).isConnected():
> inputGeomTarget = plug.child(0).asMObject()
> targetPoints = OM.MPointArray()
> fnMesh = OM.MFnMesh(inputGeomTarget)
> fnMesh.getPoints(targetPoints)
>
>
> # if not connected, retrieves the deltas and the affected component list
>
>
> else:
> inputPointsTarget = plug.child(1).asMObject()
> inputComponentsTarget = plug.child(2).asMObject()
>
> # to read the offset data, I had to use a MFnPointArrayData
>
> fnPoints = OM.MFnPointArrayData(inputPointsTarget)
> targetPoints = OM.MPointArray()
> fnPoints.copyTo(targetPoints)
>
> # read the component list data was the trickiest part, since I had to use
> MFnSingleIndexedComponent to extract (finally), an MIntArray
> # with the indices of the affected vertices
>
> componentList = OM.MFnComponentListData(inputComponentsTarget)[0]
> fnIndex = OM.MFnSingleIndexedComponent(componentList)
> targetIndices = OM.MIntArray()
> fnIndex.getElements(targetIndices)
>
>
>
> if targetIndices.length() == targetPoints.length():
> for i in range(targetPoints.length()):
> print "vertex %d has offset " %targetIndices[i],
> targetPoints[i].x,targetPoints[i].y, targetPoints[i].z
I was wondering why you are not iterating over
OM.MFnComponentListData(inputComponentsTarget) but just take the first element
with componentList = OM.MFnComponentListData(inputComponentsTarget)[0]
For some reason in my case inputComponents is a collection of lists.
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