blender-mass-unwrap.py

# @file This blender script finds all meshes without UVs and unwraps them.
# @author Terry Hendrix II github/thendrix

import bpy

# Unselect objects
for obj in bpy.context.selected_objects:
    obj.select = False

# Find and process meshes without UVs
for obj in bpy.context.scene.objects:
    if not obj.type == 'MESH' or obj.data.uv_layers:
        print("Skipping: ", obj.type, obj.name)
    else:
        print("Unwrapping:", obj.name)

        # Select mesh, select all mesh faces, and unwrap
        obj.select = True
        bpy.ops.uv.smart_project()

        # Unselect obj to avoid grouping selections
        obj.select = False

# Select all with UVs
for obj in bpy.context.scene.objects:
    if obj.type == 'MESH' and obj.data.uv_layers:
        obj.select = True