Question on vertex normals on unsoften meshes

[Bay]

Hi,

    I'm attempting to write a tool that allows me to attach and align an object according to a vertex normal. So far I've gotten it to work well on meshes that are higher res (as shown in the screenshot) but on lower res meshes I run into the problem where a single vertex has multiple normals, each the same as the vertex's adjacent polygons.  How would I obtain the IDs of the faces that are connected to this vertex? Any assistance is much appreciated. 

Thank you

Gann Boon Bay 

[Risto Jankkila]

Hi,

You can use MItMeshPolygon and it's method getConnectedFaces to obtain connected polygon id's for each vertex.

For example:

import maya.OpenMaya as OpenMaya

mSelectionList = OpenMaya.MSelectionList()
OpenMaya.MGlobal.getActiveSelectionList(mSelectionList)
mObject = OpenMaya.MObject()
mSelectionList.getDependNode(0, mObject)
polyIterator = OpenMaya.MItMeshPolygon(mObject)

while not polyIterator.isDone():
            polygonArray = OpenMaya.MIntArray()
            polyIterator.getConnectedFaces(polygonArray)

            # do something with polygonArray
            polyIterator.next()

The code is just an example of the top of my head. I can't actually check if it works since I don't have access to Maya at the moment :)

Cheers,
Risto

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[Bay]

Hi ristjan,

               sorry for not getting back to you earlier! Thanks for your help, I've managed to get the information I was looking for. Turns out vertex normal did gave me what I was looking for but since I did not build an up vector for the matrix the locator did not know how to orient it self. Using connectedVertices to build the up vector was what I ended up doing. Thanks again!

Thank you

Gann Boon Bay 

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