def append_vec_math_node(nodes, operation='NORMALIZE', name=None, a_name='A', b_name='B', output_a_name='Vector', output_b_name='Fac', a_default=(0.57735, 0.57735, 0.57735), b_default=(0.57735, 0.57735, 0.57735), parent=None, custom_color=None):
    vec_math = nodes.new('ShaderNodeVectorMath')
    vec_math.operation = operation
    vec_math.parent = parent

    if name:
        vec_math.label = vec_math.name = name
    else:
        vec_math.label = vec_math.name = operation.replace('_', ' ').capitalize()

    if custom_color:
        vec_math.use_custom_color = True
        vec_math.color = custom_color

    vec_math.inputs[0].name = a_name
    vec_math.inputs[0].default_value = a_default

    vec_math.inputs[1].name = b_name
    vec_math.inputs[1].default_value = b_default

    vec_math.outputs[0].name = output_a_name
    vec_math.outputs[1].name = output_b_name

    return vec_math