"pkoning" <nomail@nomail> wrote:

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


> Same message, complaining about the warp.

Because you have it in the wrong place.
You have a plain srgb pigment - no _pattern_.  So there is nothing to warp.
Move the warp up into the normal statement and it works.

#declare tmoon = texture
{
  pigment { color srgb <0.55 0.60 0.65> }
  finish { specular 0.1 }
  normal {
    bump_map {
      png "plasma2.png"
      bump_size 8e-3 *5
    }
    warp {spherical}
  }

  scale <rfeature, rfeature * 2, 1>
  no_bump_scale
}

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