XSI-to-Maya cometSaveWeights export (snippet)

basicExport.py

"""
Alan Fregtman's SaveCometWeights for XSI -- http://darkvertex.com/
(snippet edition -- v1.1)

** USAGE:
1. Select one or more enveloped meshes and run this from the script editor.
2. You will have the weights saved as "WEIGHTS__objectname.txt" in Comet's SaveWeights format
   under the active XSI project directory.
3. In Maya, use Michael Comet's SaveWeights tool (melscript) to import the weights file.

** NOTES:
You can find Comet's script in this zip of his tools:
http://www.comet-cartoons.com/MELfiles/cometScripts.zip
but if you use Maya 2011, you'll need this specific version of Comet's SaveWeights script:
http://s3.darkvertex.com/hlinked/4forums/cometSaveWeights_Maya2011.zip

** CometSaveWeights FORMAT spec:
The file looks like this:
    [WEIGHTS]
    [COMPONENT]
    objName.vtx[vertexID]
    worldPosX worldPosY worldPosZ
    localPosX localPosY localPosZ
    [END-WEIGHTS]
    [JOINTS]
    jointName1
    jointName2
    jointName3
    ...
    [END-JOINTS]
    // Comments look like this.
"""

from time import clock
from win32com.client import constants as c

xsi = Application
lm = xsi.LogMessage
start_time = clock()

for obj in list(xsi.Selection):
    lm( obj.FullName )
    env = obj.Envelopes(0)
    deformer = env.Deformers
    weights = env.GetWeights2()
    points = obj.ActivePrimitive.Geometry.Points
    oTrans = obj.Kinematics.Local.Transform


    filepath = XSIUtils.BuildPath(xsi.ActiveProject2.Path, "WEIGHTS__%s.txt" % obj.Name)

    cometFile = open(filepath, 'w+')
    cometFile.write("// [WEIGHTS]\n")


    oPBar = XSIUIToolkit.ProgressBar
    oPBar.Maximum = points.Count
    oPBar.Step = 1
    oPBar.CancelEnabled = True
    oPBar.Caption = "SAVING ENVELOPE/SKIN WEIGHTS:"
    oPBar.Visible = True

    more = ""
    for i in xrange(0, points.Count):
        oPBar.StatusText = "Vertex #%s" % i
        if oPBar.CancelPressed:
            break

        more += "[COMPONENT]\n%s.vtx[%s]\n" % (obj.Name, i)

        oLocalPos = points(i).Position
        more += "%s %s %s\n" % (oLocalPos.X, oLocalPos.Y, oLocalPos.Z)
        oGlobalPos = XSIMath.MapObjectPositionToWorldSpace(oTrans, oLocalPos)
        more += "%s %s %s\n" % (oGlobalPos.X, oGlobalPos.Y, oGlobalPos.Z)

        for d in xrange(0, deformer.Count):
            # In XSI weights are 0 to 100, but in Maya, weights go from 0 to 1, so...
            mayaWeight = ( float(weights(i)[d]) / 100 )
            if mayaWeight > 0.0:
                more += "%s %s " % (deformer(d).Name, mayaWeight)
        more += "\n"
        cometFile.write(more)

        more = ""
        oPBar.Increment()
    oPBar.Visible = False

    cometFile.write( "[END-WEIGHTS]\n[JOINTS]\n%s\n[END-JOINTS]\n\n" % "\n".join([item.Name for item in deformer]) )


timeTaken = clock() - start_time
comment = "Exported %s points in %s seconds. (Speed: ~%s points/sec)" % (points.Count, round(timeTaken, 3), round((float(points.Count) / timeTaken), 3))

lm(comment)
cometFile.write("// "+comment+"\n")
cometFile.close()  # Done! :D


# Look out on http://darkvertex.com/ for the pretty plugin edition someday, maybe.