خلاصه

اجازه‌نامه

من، دارنده حق تکثیر این اثر، این اثر را به مالکیت عمومی منتشر می‌کنم. این قابل اجرا در تمام نقاط جهان است. در برخی از کشورها ممکن است به صورت قانونی این امکان‌پذیر نباشد؛ اگر چنین است: من اجازهٔ استفاده از این اثر را برای هر مقصودی، بدون هیچ‌گونه شرایطی می‌دهم، تا وقتی که این شرایط توسط قانون مستلزم نشده باشد.

Here is a POV-Ray source of this image:

// +FN +UA +W1200 +H1200 +A0.0 +AM2
// Used fonts: Gentium (http://scripts.sil.org/gentium )

#version 3.6;

global_settings {
  assumed_gamma 1.0
  radiosity {
    pretrace_start 0.08           // start pretrace at this size
    pretrace_end   0.02           // end pretrace at this size
    count 35                      // higher -> higher quality (1..1600) [35]
    nearest_count 5               // higher -> higher quality (1..10) [5]
    error_bound 1.8               // higher -> smoother, less accurate [1.8]
    recursion_limit 3             // how much interreflections are calculated (1..5+) [3]
    low_error_factor .5           // reduce error_bound during last pretrace step
    gray_threshold 0.0            // increase for weakening colors (0..1) [0]
    minimum_reuse 0.015           // reuse of old radiosity samples [0.015]
    brightness 1                  // brightness of radiosity effects (0..1) [1]

    adc_bailout 0.01/2
    //normal on                   // take surface normals into account [off]
    //media on                    // take media into account [off]
    //save_file "file_name"       // save radiosity data
    //load_file "file_name"       // load saved radiosity data
    //always_sample off           // turn sampling in final trace off [on]
    //max_sample 1.0              // maximum brightness of samples
  }
}

#declare A = 1.60;
#declare B = 1.00;
#declare H = 3.00;

camera
{
  perspective angle 30
  right x*image_width/image_height
  up y
  location < 0.0, 0.0,-9.0>
  look_at < 0.0, 0.0, 0.0>
}

light_source { <-1000, 400, -1000> color rgb < 1.0, 1.0, 1.0> }

background { color rgb < 1.0, 1.0, 1.0> }

#declare Cyl0 =
union
{
  difference
  {
    cylinder
    {
      < 0.0,-0.5, 0.0>, < 0.0, 0.5, 0.0>, 1.00
    }
    cylinder
    {
      < 0.0,-0.51, 0.0>, < 0.0, 0.51, 0.0>, 0.95 open
    }
    scale <A,H,B>
    texture
    {
      pigment
      {
        granite
        color_map
        {
          [0.0 color rgbt < 0.50, 0.30, 0.25, 0.40>]
          [1.0 color rgbt < 0.80, 0.80, 0.80, 0.40>]
        }
      }
      finish { brilliance 0.5 ambient 0.0 diffuse 0.7 specular 0.2 }
    }
  }

  union
  {
    sphere { < 0.0, H/2, 0.0>, 0.03 } 
    cylinder { < 0.0, H/2, 0.0>, < 0.0,-H/2, 0.0>, 0.03 }
    cylinder { <-A, H/2, 0.0>, < A, H/2, 0.0>, 0.03 }
    cylinder { < 0.0, H/2,-B>, < 0.0, H/2, B>, 0.03 }
    cylinder { <-A,-H/2, 0.0>, < A,-H/2, 0.0>, 0.03 }
    cylinder { < 0.0,-H/2,-B>, < 0.0,-H/2, B>, 0.03 }
    texture
    {
      pigment { color rgb < 0.6, 0.1, 0.1> }
      finish { ambient 0.0 diffuse 0.3 specular 0.3 }
    }
  }

  union
  {
    text
    {
      ttf "GenI102.ttf" "a" 0.1, 0
      scale 0.7
      rotate 90*x
      translate <-A/2 - 0.15, H/2 + 0.03, 0.10>
    }
    text
    {
      ttf "GenI102.ttf" "b" 0.1, 0
      scale 0.7
      rotate 90*x
      translate < B/2 - 0.15, H/2 + 0.03, 0.10>
      rotate 90*y
    }
    text
    {
      ttf "GenI102.ttf" "h" 0.1, 0
      scale 0.7
      translate <-0.40, H*5/20 - 0.20,-0.02>
      rotate 45*y
    }
    texture
    {
      pigment { color rgb < 0.6, 0.1, 0.1> }
      finish { ambient 0.0 diffuse 0.3 specular 0.3 }
    }
  }
}

object
{
  Cyl0
  rotate -45*y
  rotate -45*x
}