Well, I'm not sure what you mean by I want to animate the armor on my player, but for my guess, it all amounts to shading. Wherever the sun is placed in any style of animation (2D/3D), you have to make sure the lighter part of the armor is directly near it, while the shading gets darker from the opposite part of it. As for moonlight (in Flash), you have to add a blue 30-20% opacity layer over your character, in which you can simply copy your character as an object (You can tell if your character doesn't show any dots), paste that over the original by using the "paste in place" option, double click and simply select your character. I know the moonlight part sounds complicated, but it's actually really easy and hard to explain into words. Here are a few examples I drew in Flash (Note, the shading technique works in any style of animation, whether it be Traditional/Digital drawings or CGI):

optifine CEM

Well...…….I wish I knew :I