Blender convert alembic animation to shape keys

abc2sk.py

# from https://blenderartists.org/t/how-to-bake-alembic-mesh-to-keyframes-for-nla/1461379/12
import bpy

ob = bpy.context
obAc = ob.active_object
mesh_data = obAc.data

start_frame = bpy.context.scene.frame_start
end_frame = bpy.context.scene.frame_end

if not obAc.data.shape_keys:
    obAc.shape_key_add(name="Basis")

# Create shape keys for each frame
for frame in range(start_frame, end_frame + 1):
    bpy.context.scene.frame_set(frame)
    
    # Evaluate the mesh with modifiers
    depsgraph = bpy.context.evaluated_depsgraph_get()
    object_eval = obAc.evaluated_get(depsgraph)
    mesh_eval = object_eval.data
    
    # Create a new shape key and set its points based on the current frame
    shape_key = obAc.shape_key_add(name=str(frame))
    
    # Collect vertex positions for the current frame
    vertices = [vertex.co for vertex in mesh_eval.vertices]
    
    # Set shape key data
    shape_key.data.foreach_set('co', [c for v in vertices for c in v])


if obAc.data.shape_keys:
    shape_keys = obAc.data.shape_keys.key_blocks
    
    # Iterate through shape keys and set keyframes
    for frame in range(start_frame, end_frame + 1):
        ob.scene.frame_set(frame)
        
        for shape_key in shape_keys:
            if shape_key.name.isdigit(): 
                value = 1.0 if int(shape_key.name) == frame else 0.0
                shape_key.value = value
                shape_key.keyframe_insert(data_path='value', index=-1)