Felbrigg wrote:
> 
> Thanks for your input.
> 
> I have tried it now, and unfortunately it has not fixed the problem.  I'm
> getting more puzzled by the hour.
> 
> Any other suggestions

After rendering the scene and trying a few things it appears to be a
mathematical precision error. If you scale down the container boxes
the discontinuities you see dissapear, e.g. -

#include "colors.inc"
#include "functions.inc"
global_settings {
                max_trace_level 80
                }
camera  {
        location <-45,5,118>*.5 look_at <-50,-1,138>
       }


background { color <0.25,0.35,0.80> }

#declare DesertScape =
        isosurface {
           function  {y - f_snoise3d(x/350, 0, z/490)*170.5}
           max_gradient 2
                contained_by {box {     <-40000,-180,-10000>*.5,
                                        < 40000, 180, 10000>*.5}}
        texture {pigment { Green }
                }
}


#declare WaterScape =
        isosurface {
           function { y - (f_ripples(x/2,y,z)*0.05) + (f_snoise3d(x/2, 0,z/2)*0.1)}
           max_gradient 2
                contained_by {box {     <-400,-180,-500>*.5,
                                        < 0, 180, 500>*.5}}
        texture {
                pigment { Clear }
                }
        translate <0,-9,0>
        hollow
        scale <1,1,1>

}


object  { WaterScape scale <1.01,1,1.01> rotate <0,100,0>}
object  { DesertScape translate <-100,0,0> scale <1.01,1,1.01>}

light_source { <-10000, 60030, -28500> colour White }


-- 
Ken Tyler

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