The texture

    texture {
       pigment {
          gradient x
          color_map {
             [0  Gray35]
             [1  Gray40]
             }
    //    scale 0.30
          frequency 1/0.30
          }
       }  // end of base texture

is supposed to produce a repeating gradient every 30 centiunits.  However,
there are also lines visible at the position of the original un-modified
gradient.  It's as if both the 0->1 gradient and the 0->0.3 gradient are
layered.

If I use a scale instead of frequency, I get the desired effect.
The docs say that the effects should be identical.

What's up?

--John

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