/* use respective cmd comment to render with, depending on GrayImage */

#declare GrayImage=yes; // yes to make input image, no for final output

#if (GrayImage=yes)

/* please note that the +hi file may be different from yours */

// cmd: +hiBeta8fix.inc +fn +w900 +h900 +oc:\images\isogray16.png

// cmd: +hiBeta8fix.inc +ft +w900 +h900 +oc:\images\isogray16.tga

// cmd: +hiBeta8fix.inc +fp +w900 +h900 +oc:\images\isogray16.ppm

#include "functions.inc"

global_settings {
        hf_gray_16 on  // whether on or off, has contour lines
        noise_generator 3  // 1, 2 or 3
         }

camera{
    orthographic
    location  y*10
    up        y*30
    right     x*30
    look_at   0
}

isosurface{
    function{y-f_noise3d(x,y,z)} // could this be the problem?
    contained_by{box{<0,-0.1,-30>,<30,1,0>}}
    // notice the default max_gradient, etc, is used
    texture{pigment{gradient y}finish{ambient 1}}
    translate x*-15+z*15
}

#else

/* be sure to use this command line when GrayImage=no ! */

// cmd: +hiBeta8fix.inc +fn +w320 +h240 +oc:\images\isotest16.png

#declare F_p=function {
       pigment {image_map {
/* use input image intended for test */
        png "isogray16.png"
 //       tga "isogray16.tga"
 //       ppm "isogray16.ppm" // errors, unsupported number of colors
        }
        rotate 90*x translate -.5}
}

isosurface {
        function {y-F_p(x,y,z).gray*.1}
        contained_by {box {-1,1}}
 texture {pigment {rgb 1}}
   scale <10,1,10> rotate -45*x translate <0,.25,2>
}

light_source {<10,10,-10>,1}
#end