Thanks to all for the feedback and comments! @rcarmo Yes, bumps are enhanced, to make the surface more dramatic. This scale is a parameter in the notebook, it

Thanks to all for the feedback and comments! @rcarmo Yes, bumps are enhanced, to make the surface more dramatic. This scale is a parameter in the notebook, it can be set to the realistic 1.15% of the mean radius. On another forum, someone pointed out that the Lambertian shading makes the Moon surface too smooth. So the diffuse material roughness will come in the next PlotOptiX release, in a few days. :)