It'd help to see the code. Beyond that, I'd suggest playing around with the
threshold a bit, or increasing the number of components between the
base-point and the top. Maybe run them through a loop. ie:

#declare YTran=0;
#declare Scaler=1;

blob {
 threshold 0.65
 #while (YTran <= 10)
  sphere {0,1,1
   scale Scaler
   translate YTran*y
  }
  #declare YTran=YTran+0.25;
  #declare Scaler=Scaler+0.1;
 #end
 pigment {rgb <0.65,0.8,0.65>}
}

The more components you use, the smoother the transition.

David

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