Eu, deținătorul drepturilor de autor ale acestei opere, o eliberez domeniului public. Aceasta se aplică în întreaga lume. În anumite țări există posibilitatea ca acest lucru să nu fie legal posibil; în acest caz: permit oricui să utilizeze această operă în orice scop, fără nicio condiție, atâta timp cât asemenea condiții nu sunt cerute de lege.

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 }