yes...a layer put above the parts that need it...
#declare Tex1 =
texture {
  pigment {
   gradient y
   color_map {
     [0.00 color rgbt 1.0]
     [0.45 color rgbt <0.0, 0.0, 0.0, 1.0>]
     [0.55 color rgbt <0.01, 0.01, 0.01, 0.75>]
     [0.70 color rgbt <0.01, 0.01, 0.01, 0.1>]
     [0.95 color rgbt <0.01, 0.01, 0.01, 0.0>]
     [1.50 color rgbt <0.01, 0.01, 0.01, 0.0>]
   }
   turbulence 0.15
   scale <1.0, 1.1, 1.0>
  }
}

      David

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