Would just retrieving the number of uvs in a given uvset give you the count
you are looking for?
I created a sphere, then started creating uv shells out of part of the mesh.
len(cmds.ls('pSphere1.map[*]', fl=True))
On Thu, Nov 9, 2017 at 8:03 AM, Benjam901 <benandrewhe...@gmail.com> wrote:
> Hello all,
>
> So here is my struggle at the moment.
>
> I am trying to guesstimate the "actual" in-engine vert count for a given
> object in Maya so we can validate the LOD steps per object before we export.
>
> *Proposed solution:*
> The way I am trying to do this is by checking that a vertex is on a UV
> border edge and adding this to the total vert count.
>
> So for example an object with 500 verts which has a UV border straight
> through the middle will end up with 1000 verts in-engine because of the UV
> split.
>
> The problem I am having is wrapping my head around the underlying data
> models for verts, faces, edges and uvs.
>
> *Solution 1:*
> I have a sort of working solution that does not use the API but instead
> relies on the mel command: *polySelectBorderShell 1*
>
> import pymel.core as pm
> import maya.mel as mel
>
> sel = pm.ls(sl=True)[0] # Get object selection
>
> # Edges must be selected here
> mel.eval("polySelectBorderShell 1")
> uvs = pm.polyListComponentConversion(fe=True, tuv=True)
> uvList = pm.ls(uvs, flatten=True)
> uvDict = {}
> for i in uvList:
> print i
> uvNum = int(i.split('[')[-1].split(']')[0])
> uvDict.update({uvNum:i})
>
> vertBorders = {} # e.g. {'map1':[1, 2, 3, 5, 71]}
> uvSets = pm.polyUVSet(sel, query=True, allUVSets=True)
> for uvSet in uvSets:
> vertBorders.update({uvSet:[]})
> uvs = pm.polyEvaluate(sel, uvs=uvSet, uv=True)
> for uvNum in range(uvs):
> if uvNum in uvDict:
> vert = pm.polyListComponentConversion(uvDict[uvNum], fuv=True,
> tv=True)[0]
> vertBorders[uvSet].append(vert)
>
> count = 0
> multiList = vertBorders.values()
> result = set(multiList[0]).intersection(*multiList[:1])
> count += len(result)
> newMultiList = []
> for L in multiList:
> newList = [i for i in L if i not in result]
> count += len(newList)
> print count
>
>
> The above solution kinda gets me there and I need to make sure its legit
> and patch it up but for the most part it works.
> Problem is that it is *SLOW *hence trying to use the API.
>
> *Solution 2:*
> For the API I am following along with this mode of thinking here:
> *http://forums.cgsociety.org/archive/index.php?t-729364.html
> <http://forums.cgsociety.org/archive/index.php?t-729364.html>*
>
> Mu current solution and where I am stuck is here. I know I need to run
> some comparisons but how and on what I am deadlocked at.
>
> def getVertFromId(dagPath, vertID):
> vertIt = OM.MItMeshVertex(dagPath)
> vtxIdUtil = OM.MScriptUtil()
> vtxIdUtil.createFromInt(0)
> vtxIdPtr = vtxIdUtil.asIntPtr()
> vertIt.setIndex(vertID, vtxIdPtr)
> return vertIt
>
> def getFaceFromId(dagPath, faceId):
> faceIt = OM.MItMeshPolygon(dagPath)
> faceIdUtil = OM.MScriptUtil()
> faceIdUtil.createFromInt(0)
> faceIdPtr = faceIdUtil.asIntPtr()
> faceIt.setIndex(faceId, faceIdPtr)
> return faceIt
>
> def getVertUVInfo(vertIn):
> uArr = OM.MFloatArray()
> vArr = OM.MFloatArray()
> fIDs = OM.MIntArray()
> uvIndices = OM.MIntArray()
> uvSet = 'map1'
> vertIn.getUVs(uArr, vArr, fIDs, uvSet)
> vertIn.getUVIndices(uvIndices, uvSet)
>
> print uArr, vArr, fIDs, uvIndices
> return fIDs, uvIndices
>
> def stripUnecessaryFaces(currentEdgeFaces, faceIDs1, faceIDs2):
> fID1 = []
> fID2 = []
> for fID in faceIDs1:
> if fID in currentEdgeFaces:
> fID1.append(fID)
>
> for fID in faceIDs2:
> if fID in currentEdgeFaces:
> fID2.append(fID)
>
> return fID1, fID2
>
> def main():
> mSelList = OM.MSelectionList()
> OM.MGlobal.getActiveSelectionList(mSelList)
> sel = OM.MItSelectionList(mSelList)
>
> dagPath = OM.MDagPath()
> sel.getDagPath(dagPath)
> dagPath.extendToShape()
> connFaces = OM.MIntArray()
>
> edgeIter = OM.MItMeshEdge(dagPath)
> while not edgeIter.isDone():
> f1 = None
> f2 = None
> edgeIter.getConnectedFaces(connFaces)
> if len(connFaces) == 1:
> # open edge
> print 'Open edge'
>
> f1 = connFaces[0] # face 1
> try:
> f2 = connFaces[1] # face 2
> except:
> pass
>
> vert1Index = edgeIter.index(0)
> vert2Index = edgeIter.index(1)
>
> MfVert1 = getVertFromId(dagPath, vert1Index)
> MfVert2 = getVertFromId(dagPath, vert2Index)
>
> fIdsvert1, uvIndicesVert1 = getVertUVInfo(MfVert1)
> fIdsvert2, uvIndicesVert2 = getVertUVInfo(MfVert2)
>
> edgeIter.next()
>
>
> Any suggestions on where to go from here or how to solve this is very much
> appreciated!
>
> // Ben
>
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