How about using a gradient... like this

#declare Waves = 
   texture 
   {   
      pigment
      {
         gradient z
         color_map
         {
            [ 0.0     rgbft <0.254902, 0.243137, 0.784314, 0.0, 0.0> ]
            [ 0.5     rgbft <0.588235, 0.607843, 0.847059, 0.0, 0.0> ]
            [ 1.0     rgbft <0.254902, 0.243137, 0.784314, 0.0, 0.0> ]
         }
      }   
      normal
      {
         gradient <1.0, 0.0, 1.0> , 0.5
         slope_map
         {
            [ 0.0  <0.0 , 0.0> ]
            [ 0.5  <1.0 , 0.0> ]
            [ 1.0  <0.0 , 0.0> ]
         }
      }   
      scale  <0.5, 1.0, 1.0>
   }

Steve

Ken wrote:
> 
> Howdy all !
> 
>     I have a question about the wave and ripple patterns that
> are used in POV-Ray. It is evident that both use a concentric
> method of implementation. That is to say they form like drop
> rings in a pond.
> 
>     This is great for modeling fish ponds and swimming
> pools but really makes it difficult to accurately model straight
> line waves as would be produced by a boat or the typical
> wave/swell pattern in the ocean. Certainly you can argue that
> the ocean has a multitude of cross patterns and I won't argue
> with you. But there have been days when I was out fishing
> on the ocean and the swells were very smooth and seemingly
> very straight.
> 
>     Is there a wave form now available in Pov that I have missed
> that will allow a straight sine wave type pattern ?
>     I checked the docs and if it's in there I somehow missed it.
> 
> If it's not now available should it be added ?
> 
> Would it be difficult to implement a normal pattern like this ?
> 
> See below for a list of supported pattern types I compiled from
> the docs.
> 
> Seeking your answers, impressions, and opinions on this topic.
> 
> This list contains what I believe are all 25 wave forms and
> normal/pigment patterns available in POV-Ray.
> 
> Have I missed any ?
> 
> Patterns List:
> Agate     Checker   Hexagon   Quilted   Spiral2
> Average  Crackle   Leopard   Radial    Spotted
> Bozo      Dents     Mandel    Ripples   Waves
> Brick     Gradient  Marble    Scalloped Wood
> Bumps     Granite   Onion     Spiral1   Wrinkles
> 
> Thanks
> 
> Ken

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