I have the following code in python using the vedo package
mesh.lighting(style='plastic', ambient=None, diffuse=None, specular=None, specular_color=None, specular_power=None, metallicity=None, roughness=None)
I know that I need a combination for ambient, diffuse, specular value to creating phong lighting. How do I determine these values? And how do I know I have created phong lighting?