I'm an absolute beginner, so please bear with me.

I'm trying to create a snow globe, based on a hollow glass sphere. This
works as expected. However, when I place an additional object (sphere)
inside the globe, it turns out black, as if it's not lit. When I give the
additional sphere a reflective finish, it does come out as expected.
I'm using no lights in my scene, all light comes from HDRI lighting. When I
do place some lights, the second sphere does show its color, but still too
dark.

BTW, increasing max_trace_level doesn't help. The code for both objects is
stated below.


//glass globe
object{
 difference{
  sphere {
   <0, 0, 0> // center of sphere <X Y Z>
   500/65    // radius of sphere
  }
  sphere {
   <0, 0, 0> // center of sphere <X Y Z>
   (500/65)-0.15    // radius of sphere
  }
 }
 material{
    texture{
      pigment { color rgbf <0.98, 0.98, 0.98, 0.925> }
     finish { F_Glass3 }
    normal{bumps .1 scale 4}
   finish{reflection{.01,.9 fresnel} conserve_energy}
   }
  interior{I_Glass}
  }
}

//additional sphere
sphere {
  <0, 0, 0>, 2
  texture {
  pigment { color rgb <1,0,0>}
  finish {
   ambient 0
   diffuse 1
  }
 }
}

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