FaceEXShapekey02.py

import bpy

def pivotpointchange(pivotpoint):
    for area in bpy.context.screen.areas:
        if area.type == 'VIEW_3D':
            area.spaces[0].pivot_point = pivotpoint
            
def currentpivotpoint():
    for area in bpy.context.screen.areas:
        if area.type == 'VIEW_3D':
            return area.spaces[0].pivot_point
def get_override(area_type, region_type):
    for area in bpy.context.screen.areas: 
        if area.type == area_type:             
            for region in area.regions:                 
                if region.type == region_type:                    
                    override = {'area': area, 'region': region} 
                    return override
    #error message if the area or region wasn't found
    raise RuntimeError("Wasn't able to find", region_type," in area ", area_type,
                        "\n Make sure it's open while executing script.")


bl_info = {
    "name": "FaceEXShapekey",
    "author": "lowteq",
    "version": (1, 0),
    "blender": (2, 78, 0),
    "location": "3D View > Mesh",
    "description": "Create extra shapekeys for faces",
    "warning": "",
    "support": "TESTING",
    "wiki_url": "",
    "tracker_url": "",
    "category": "User Interface"
}


class FaceEXShapekey(bpy.types.Operator):

    bl_idname = "object.faceexshapekey"
    bl_label = "Face EX Shapekey"
    bl_description = "Create extra shapekeys for faces"
    bl_options = {'REGISTER', 'UNDO'}

    def execute(self, context):
        
        
        duplicateFlag = True
        innerOffset = 0.05
        innerScale = 0.5

        surfOffset = 0.001
        surfScale = 1.00


        if bpy.context.mode != "EDIT_MESH":
            print("must run in EDITMODE")
            exit()
            
        obj = bpy.context.object
        obj.active_shape_key_index = 0

        if duplicateFlag:
            bpy.ops.mesh.duplicate()
            

        override = get_override("VIEW_3D","WINDOW")
        pivotPointTemp = currentpivotpoint()
        pivotpointchange('INDIVIDUAL_ORIGINS')

        bpy.ops.transform.translate(value=(0, innerOffset, 0), constraint_axis=(False, True, False), constraint_orientation='GLOBAL', mirror=False, proportional='DISABLED')
        bpy.ops.transform.resize(override,value=(innerScale, innerScale, innerScale), constraint_axis=(False, False, False), constraint_orientation='GLOBAL', mirror=False, proportional='DISABLED')

        exshapekey = obj.shape_key_add(name="Ex",from_mix=False)
        index = len(obj.data.shape_keys.key_blocks) - 1
        bpy.context.object.active_shape_key_index = index

        obj.data.shape_keys.key_blocks[exshapekey.name].value = 1

        bpy.ops.transform.resize(override,value=(1/innerScale, 1/innerScale, 1/innerScale), constraint_axis=(False, False, False), constraint_orientation='GLOBAL', mirror=True, proportional='DISABLED')
        bpy.ops.transform.translate(value=(0, -(innerOffset+surfOffset), 0), constraint_axis=(False, True, False), constraint_orientation='GLOBAL', mirror=True, proportional='DISABLED')
        bpy.ops.transform.resize(override,value=(surfScale, surfScale, surfScale), constraint_axis=(False, False, False), constraint_orientation='GLOBAL', mirror=True, proportional='DISABLED')

        obj.data.shape_keys.key_blocks[exshapekey.name].value = 0

        pivotpointchange(pivotPointTemp)