cloned_restore.py

import bpy

mode_set = bpy.ops.object.mode_set


def clone():
    ob = bpy.context.active_object

    mode_set(mode='OBJECT')
    clone_mesh = ob.data.copy()
    clone_mesh.name = ob.name + '_clone'
    clone_mesh.use_fake_user = True

    mode_set(mode='EDIT')


def restore():
    ob = bpy.context.active_object
    mode_set(mode='OBJECT')

    clone_mesh = bpy.data.meshes.get(ob.name + '_clone')
    clone_verts = clone_mesh.vertices
    for v in ob.data.vertices:
        if v.select:
            v.co = clone_verts[v.index].co

    mode_set(mode='EDIT')


def changed():
    ob = bpy.context.active_object
    bpy.ops.mesh.select_all(action='DESELECT')

    mode_set(mode='OBJECT')
    clone_mesh = bpy.data.meshes.get(ob.name + '_clone')
    clone_verts = clone_mesh.vertices
    for v in ob.data.vertices:
        if (v.co - clone_verts[v.index].co).length > 0.0001:
            v.select = True

    mode_set(mode='EDIT')


class ClonedRestoreOps(bpy.types.Operator):

    bl_idname = "object.cloned_restore_op"
    bl_label = "Short Name"

    fn_name = bpy.props.StringProperty(default='')

    def execute(self, context):
        exec(self.fn_name + '()')
        return {'FINISHED'}


class ClonedRestore(bpy.types.Panel):
    """Creates a Panel in the Object properties window"""
    bl_label = "Clone Restore Panel"
    bl_idname = "OBJECT_PT_clone_restore"
    bl_space_type = 'VIEW_3D'
    bl_region_type = 'TOOLS'

    def draw(self, context):
        layout = self.layout

        obj = context.object
        col = layout.column()

        operators = 'clone', 'restore', 'changed'
        for op in operators:
            ob = context.active_object
            if op == 'clone' and ob and (ob.name + '_clone' in bpy.data.meshes):
                col.label('cloned as: ' + ob.name + '_clone')
            else:
                col.operator("object.cloned_restore_op", text=op).fn_name = op


def register():
    bpy.utils.register_module(__name__)


def unregister():
    bpy.utils.unregister_module(__name__)


if __name__ == "__main__":
    register()