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*
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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