kurtzlepirate-09EE8A.16445508052004@news.povray.org...
>
>   where to get infos of this method ??
>   thanks

I just quote Jaime's  april/29/2004 response in "My LOTW project" thread on
this group:

>    Casually, I'm just tweaking this texture. Now I simlified it a bit,
> removing the intersection. The same terrain itself translated a bit is
> enough. There is the relevant part:
>
>   #declare terrain_coast=object{terrain translate Foam_Level*y}
>   #declare m_water=
>   material{
>    texture{
>     pigment_pattern{object{terrain_coast rgb 0, rgb 1}}
>     texture_map{
>       [0 t_water]
>       [1 t_foam]
>     }
>     scale 100 warp{turbulence .3 lambda 3} scale 1/100
>     scale 1000 warp{turbulence .3 lambda 3} scale 1/1000
>    }
>    ...
>
>
>    The translation amount depends on your scene scale and how much foam
> you want, and the same can be applied to the warps scale.
>

the trick is to use an object as pattern
either the calculated point is inside the object and the returned value is 1
or the point is outside and the value is 0
It is a boolean pattern

my complete code for the sea (including isosurface and material) is on the
p.b.s-f group

Marc

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