"Kima" <nomail@nomail> wrote:

> I tried to make one by merging two perpendicular planes (to eliminate the
> horizon line), but wasn't successful.

You could use a bezier patch, a polynomial, blobbing together two planes

http://news.povray.org/povray.binaries.images/thread/%3Cweb.5cf31c5f43128c364eec112d0%40news.povray.org%3E/

doing an interpolation between two planes,

http://news.povray.org/povray.binaries.images/thread/%3Cweb.5d4b7ce3a683fa3a4eec112d0%40news.povray.org%3E/

or just use a curved function for an isosurface:



#version 3.8;
global_settings {assumed_gamma 1.0 }
#include "colors.inc"
#include "functions.inc"
#include "math.inc"



camera {
 //location <0, 0, -2.5>
 location <0, 5, -10>
 right x*image_width/image_height
 up y
 look_at <0, 2, 0>
 //look_at <0, 0, 0.01>
}
light_source {<10, 10, -10> rgb 1}
background {Gray10}

#declare Tan = texture {pigment {rgb <0.92, 0.60, 0.20>} finish {diffuse 0.7
specular 0.2 reflection 0.02}}


  isosurface {
    function {y-1/z}
    open
    threshold 0
    #declare Gradient = 1000;
    #declare Min_factor= 0.6;
    max_gradient Gradient
    //evaluate Gradient*Min_factor,  sqrt(Gradient/(Gradient*Min_factor)),  min
(0.7, 1.0)
    accuracy     0.01
    contained_by {box {<-3, 0, 0.0000001>, <3, 5, 5>}}
    //all_intersections
    polarity off
      interior_texture {Tan} texture {Tan}
      rotate y*180
     scale 1
     //translate -x*10
    }

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