Hi again Mike,

Yeah, but, let me sometime to think a bit more. I will tray your answer 
later, I think that I'm starting to understand it.
Fisrt I'm going to tray one of your exemples from your website, I think that 
could work properly and then I will study your post.
Surely your answer is completly correct and I prefer to see it later.

Thank your ver much for your help.

I will explain me results later :).

Best regards,
Oleguer



news:OOe### [at] econymdemoncouk...
> Wasn't it Oleguer Vilella who wrote:
>>I want a function to make
>>the surface go up and go down. I think a spline would be a good idea.
>>
>>What do you think Mike?
>
> Perhaps something like this:
>
>
> #version 3.6;
>
> global_settings {assumed_gamma 1.0}
>
> camera {location  <0,50,-160> look_at <0,0,0>}
>
> background {rgb 1}
>
> light_source {<-30, 100, -30> color rgb 1}
>
> // ----------------------------------------
>
> #include "colors.inc"
>
> #declare S = function {
>   spline {
>     linear_spline
>    -1.0, < 0.5, 0, 0>,
>    -0.5, < 0,   0, 0>,
>     0.01,< 0.2, 0, 0>,
>     0.5, <-0.2, 0, 0>,
>     1, <-0.2, 0, 0>
>   }
> }
>
> #declare Length = 100;
> #declare Height = 50;
> #declare Thickness = 10;
>
> #declare  Q = function {y - Height*S(x/Length).x}
>
> isosurface {
> function { abs(Q(x,y,z)) - Thickness  }
>  max_gradient 2
>  contained_by{box{ -<Length, Height+Thickness, Thickness>
>                     <Length, Height+Thickness, Thickness> }}
>  pigment { color Green}
>  finish { ambient 0.2 diffuse 0.8 phong 1 }
> }
>
>
> This is rigged for the container box to just fit as long as the spline
> values stay between -1.0 and +1.0.
>
>
> -- 
> Mike Williams
> Gentleman of Leisure

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