Mirror Meshes

mirror_meshes.py

"""
Select all meshes that needs to be mirrored.

Script produces a mirror locator with a plane for visualizing.
"""
import pymel.core as pm


selection = pm.ls(selection=True)

# Create mirror locator/plane.
locator = pm.spaceLocator()

mirror_plane = pm.polyPlane()[0]
pm.parent(mirror_plane, locator)
mirror_plane.rotateZ.set(-90)
pm.rename(mirror_plane, "mirror_visualizer")

for node in selection:
    # Duplicate mesh.
    duplicate = pm.duplicate(node)

    # Blendshape to original mesh in worldspace and zero out transforms.
    blendshape = pm.blendShape(node, duplicate)[0]
    pm.blendShape(blendshape, edit=True, weight=[(0, 1)])
    blendshape.origin.set(0)

    pm.makeIdentity(duplicate)

    # Parent to mirror locator.
    pm.parent(duplicate, locator)

    # Duplicate blendshape as instance. Set x scale to -1.
    instance = pm.instance(duplicate)[0]
    instance.scaleX.set(-1)