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Blender Python script to bake in an ambient occlusion map offline
import bpy
ops = bpy.ops
scene = bpy.context.scene
mesh = bpy.ops.mesh
# Delete default scene objects
ops.object.select_all()
ops.object.select_all()
ops.object.delete()
# Import the model from our Three scene
ops.import_scene.obj(filepath="input.obj")
current_mesh = scene.objects[0]
# Set it to active and go into edit mode
scene.objects.active = current_mesh
ops.object.mode_set(mode='EDIT')
# Mesh cleanup step, since what's coming out of Three is mostly cubes laying side by side.
# Remove double verts...
mesh.select_mode(type="VERT")
mesh.remove_doubles()
# Merge tris into quads...
mesh.select_mode(type="FACE")
mesh.dissolve_limited()
# Remove interior faces
mesh.select_all()
mesh.select_interior_faces()
mesh.delete(type="FACE")
# Create a second UV layer for the ambient occlusion map
bpy.ops.mesh.uv_texture_add()
current_mesh.data.uv_layers[1].name = 'Shadows'
# Unwrap the mesh
mesh.select_all()
ops.uv.lightmap_pack(PREF_IMG_PX_SIZE=512)
# Create a new image to bake the lighting in to
bpy.ops.image.new(name="AO Map")
image = bpy.data.images['AO Map']
# Set the image to active (applies it to the object)
bpy.data.screens['UV Editing'].areas[1].spaces[0].image = image
# Bake the lightmap
bpy.data.scenes["Scene"].render.bake_margin = 4
bpy.data.worlds["World"].light_settings.use_ambient_occlusion = True
bpy.data.worlds["World"].light_settings.samples = 10
bpy.ops.object.bake_image()
# Save the baked image
image.filepath_raw = "output.png"
image.file_format = "PNG"
image.save()
# Save the new model with the new UV channel
ops.object.mode_set(mode='OBJECT')
bpy.ops.export.three(filepath="output.json")
@AndrewRayCode

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@AndrewRayCode AndrewRayCode commented Jul 8, 2016

Usage: blender --offline --python example-bake.py

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