import bpy

# Override existing extras?

override = True

# Extra blend shapes

shapekeys = [

]

# Recursive traverse

def traverse(x):

yield from traverse(c)

# Has shape keys

def hasShapekeys(x):

return hasattr(x, 'data') and hasattr(x.data, 'shape_keys') and hasattr(x.data.shape_keys, 'key_blocks')

# Build missing blend shapes

for r in bpy.context.scene.objects:

for o in traverse(r):

if hasShapekeys(o):

keys = o.data.shape_keys.key_blocks

for b in shapekeys:

name = b["name"]

mix = b["mix"]

# Override

if override:

if not keys.get(name) is None:

o.shape_key_remove(keys.get(name))

# Check/verify the extra doesn't already exist

if keys.get(name) is None:

# Check if some component exists

for m in mix:

if not keys.get(m["name"]) is None:

# Reset all shapes

for k in keys:

k.value = 0

# Create a mixed shape

for m in mix:

if not keys.get(m["name"]) is None:

keys.get(m["name"]).value = m["value"]

# Create a new shape key from the mix

o.shape_key_add(name=name,from_mix=True)

# Reset all shapes

for k in keys:

k.value = 0

break