"Kenneth" <kdw### [at] gmailcom> wrote:
> ...
> Apparently, a warp{...} cannot be added to a previously-#declared texture. I
> sometimes run into similar problems; some things can be added, some can't.
>
> Your syntax is like this:
>
> #declare tmoon = texture
> {
>   pbfr // [previously-#declared]
>   scale <rfeature, rfeature * 2, 1>
>   no_bump_scale
>   warp {spherical}
> }
>
> Interestingly, the no_bump_scale *is* OK there. I was surprised at that.

That doesn't seem to be the explanation.  I rewrote it without any declared
identifiers and it still fails:

#declare tmoon = texture
{
  pigment { color srgb <0.55 0.60 0.65> }
  finish { moon_finish }
  normal {
    bump_map {
      png "robo-bfr.png"
      bump_size 8e-3 *5
    }
  }
  warp {spherical}
  scale <rfeature, rfeature * 2, 1>
  no_bump_scale
}

Same message, complaining about the warp.

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