Outline around sphere

Question

Is there an easy way to draw an outline around a sphere? Is there something like EdgeForm[] that will work?

I'm looking for perhaps a thick red line; I'm making a plot with many spheres of different colors and opacities, and I need a way of visually distinguishing the ones that are "in use" from the ones that are "inert".

Answer 1

This will produce an outline around the sphere which makes it stand out a bit in a plot of many, however it also adds an overlay over it, so it's by no means optimal:

Graphics3D[
  {
    Table[
      Sphere[{x, y, z}, 0.2], 
      {x, -1, 1},{y, -1, 1}, {z, -1, 1}
    ],
    Glow[Blue], 
    Black, 
    FaceForm[Opacity[0.2]], 
    Sphere[{1, 0, 1}, 0.25]
  }
 ]