Better technique for Mirroring Blendshapes?

[Anonymous]

Hi,

I'm using the method for mirroring blendshapes that involves wrap deformers. The method works great for models under around 5,000 verts but after that it takes quite a while to calculate. 

I was wondering if there's any information out there on how to do this process a little more efficiently. 

Thanks,

Ben

Here's my script for reference:

import maya.cmds as cmds


# takes your base mesh (1) and the shape that you want to mirror (2) and creates the inverse blendshape
# assumes we want to mirror in -x

def mirrorBlendshape():
    sel = cmds.ls(sl=1, o=1)
    base = sel[0]
    shape = sel[1]
    # target mesh is the one that will recieve the blendshape and be mirrored
    target = cmds.duplicate(base, returnRootsOnly=1)
    # the invShape mesh is the one that will be the final inverted blenshape
    invShape = cmds.duplicate(base, returnRootsOnly=1)

    # create our blendshape, mirror the mesh, create the wrap deformer, and apply the blendshape
    bs = cmds.blendShape(shape, target)
    cmds.xform(target, s=(-1, 1, 1))
    cmds.select(invShape[0], target[0], add=1)

    cmds.CreateWrap()
    # "inflate" our mesh to the correct mirrored position using our blendshape. BIG calculation
    cmds.setAttr(bs[0] + "." + shape, 1)

    hist = cmds.listHistory(invShape)
    index = hist.index(target[0] + "BaseShape")
    # delete the history on our final shape so that we can delete the shape we used to make it
    cmds.delete(invShape, constructionHistory=1)

    cmds.select(target[0] + "BaseShape")
    x = cmds.pickWalk(d="up")
    # delete our base shape node
    cmds.delete(x)
    
    # delete our target shape so we're just left with the shape we want
    cmds.delete(target)
    return invShape


mirrorBlendshape()