El 12/04/16 a las 18:40, Jérôme M. Berger escribió:
> 	BTW, it would probably be faster to replace your code with:
>
> // Will probably need tweaking
> #declare M=0.0000005;
>
> #declare d2xpd2y=function{
>     (f_water(x+EPSILON,y,0)+f_water(x-EPSILON,y,0)+
>      f_water(x,y+EPSILON,0)+f_water(x,y-EPSILON,0)-
>      4*f_water(x,y,0))/
>     (EPSILON*EPSILON)
> }
>
> #declare selected=function{select(x,abs(x))}
>
> #declare t_ocean=
> texture{
>    pigment_pattern{
>      function{selected(d2xpd2y(x,y,0))*M,0)}
>    }
>    texture_map{
>      [0.0 t_water]
>      [0.1 t_foam]
>    }
> }
>
> 	This only calls f_water 5 times where your code called it 16 times...
>

   Yes, it seems to render noticeably faster... but I had to correct 
some things:

#declare M=0.0000005;

#declare d2xpd2y=function{
    (f_water(x+EPSILON,y,0)+f_water(x-EPSILON,y,0)+
     f_water(x,y+EPSILON,0)+f_water(x,y-EPSILON,0)-
     4*f_water(x,y,0))/
    (EPSILON*EPSILON)
}

#declare selected=function(x){select(x,abs(x),0)}

#declare t_ocean=
texture{
   pigment_pattern{
     function{selected(d2xpd2y(x,y,0))*M}
   }
   texture_map{
     [0.0 t_water]
     [0.1 t_foam]
   }
}

That works! Thanks!

--
jaime

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