.py

"""Makes all objects' material metallic."""
import bpy
USE_TRANSMISSION = False
def remove():
    """Removes previously created materials."""
    for material in bpy.data.materials:
        if material.name == 'MyMaterial':
            bpy.data.materials.remove(material)
def create_material():
    """Creates a metallic material and returns it."""
    material = bpy.data.materials.new('MyMaterial')
    material.use_nodes = True
    node_tree = material.node_tree
    assert isinstance(node_tree, bpy.types.ShaderNodeTree)
    principled_bsdf = node_tree.nodes['Principled BSDF']
    assert isinstance(principled_bsdf, bpy.types.ShaderNodeBsdfPrincipled)
    if USE_TRANSMISSION:
        principled_bsdf.inputs['Base Color'  ].default_value = (1, 1, 1, 1)
        principled_bsdf.inputs['Metallic'    ].default_value = 0.0
        principled_bsdf.inputs['Roughness'   ].default_value = 0.0
        principled_bsdf.inputs['IOR'         ].default_value = 1.33
        principled_bsdf.inputs['Transmission'].default_value = 1.0
    else:
        principled_bsdf.inputs['Metallic' ].default_value = 1.0
        principled_bsdf.inputs['Roughness'].default_value = 0.0
    return material
def set_material(object, material):
    """Sets the material to all slots in the object."""
    for slot in object.material_slots:
        slot.material = material
def set_materials():
    """Makes all objects' material metallic."""
    material = create_material()
    for object in bpy.data.objects:
        set_material(object, material)
remove()
set_materials()
print('Done.')