Hello,

How can I avoid the black cracks in the isosurface?

And how to move the camera in a circular radius movement around

an isosurface object?

Thanks,

H.Frik

Here is the code:

#include "colors.inc"          & nbsp;           &n bsp;
#include "stones.inc"
#include "textures.inc"
#include "shapes.inc"
#include "woods.inc"
#include "functions.inc"

global_settings {

max_trace_level 20

}

camera {
location <1.3,0.8,5.>

look_at <0.,0.4,0>
}

#declare Lightbulb = union {
    merge {
      sphere { <0,0,0>,1 }
      cylinder {
        <0,0,1>, <0,0,0>, 1
        scale <0.35, 0.35, 1.0>
        translate 0.5*z
      }
      texture {
        pigment {color rgb <1, 1, 1>}
        finish {ambient .8 diffuse .6}
      }
    }
    cylinder {
      <0,0,1>, <0,0,0>, 1
      scale <0.4, 0.4, 0.5>
      texture { Brass_Texture }
      translate 1.5*z
    }
    rotate -90*x
    scale 0.5
}

light_source {
     <5,5,20>
    color White
    looks_like { Lightbulb }
}


light_source {
    <5, 50,20>

   color White
}
sky_sphere {
    pigment {
      gradient y
      color_map {
        [ 0.5 color CornflowerBlue ]
        [ 1.0 color MidnightBlue ]

      }
      scale 1
      translate -1
    }
}
#declare F=function{pattern{
ripples

scale 0.2
rotate y*30
warp{repeat x*0.4 flip x}
}
}
#declare P=function{pigment{leopard
   colour_map{[0.0 rgb 0.0]
            ;   [0.3 rgb 0.0]
            ;   [1.0 rgb 1.0]}
   scale 0.1
}}
#declare P1=function{pattern{leopard turbulence 0.3 scale 0.2}}
#declare P2=function{pattern{leopard turbulence 0.3 scale 0.5}}
#declare P3=function {x*0 + y + z*0}

isosurface {function { y - P1(x,y*x,z)*0.3 -P2(x,0,z)*1.0+
y - P1(x,y,z)*0.3 - P2(x,0,z)*1.0+
f_noise3d(x,y,z)*0.3}

rotate <0,20,0>
scale 2

normal { crackle 0.1 scale .102 }
normal { wrinkles 0.001 scale .02 }
normal { bumps 0.01 scale .02 }// translate <0,0,0>

texture {
   T_Stone23 scale <0.35, 0.35, 1.0>}
        scale 3
           &nb sp;
finish {ambient 0.15 diffuse 0.85 phong 0.2 reflection 0.1} // pre-defined in finish.inc
normal { crackle 0.1 scale .02 }
   normal { wrinkles 0.001 scale .02 }
   normal { bumps 0.01 scale .02 }
}

   fog { fog_type   2
      distance   2.8
   color White
      fog_offset 0.1
      fog_alt    0.2
      turbulence 0.8

}