"robart" <rob### [at] tpgcomau> wrote:
> I only have a single sphere to which I applied the Glass texture and it just
> appears as black. I've followed other "transparent object" tutorials and
> they appeared as black too. I've tried raising max_trace_level but that
> didn't help.
>
What you need is something else in your scene. So you can see the
transparency of the sphere. for example add a sky sphere.

sky_sphere {
  pigment {
    gradient y
    color_map { [0.0 color rgb <0.7,0.7,1.0>] [1.0 color blue 0.5] }
  }
}


Stephen

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