// This work is licensed under the Creative Commons Attribution-ShareAlike 3.0 Unported License.
// To view a copy of this license, visit http://creativecommons.org/licenses/by-sa/3.0/ or send a
// letter to Creative Commons, 444 Castro Street, Suite 900, Mountain View, California, 94041, USA.

// Persistence of Vision Raytracer Scene Description File
// File: float5.pov
// Description: Demonstrates various new float math functions and #while loop
// Modified for 3.5: changed "log()" to "ln()".
//
// -w320 -h240
// -w800 -h600 +a0.3

#version 3.6;

global_settings {
  assumed_gamma 1.0
  }

#include "colors.inc"

#declare Rad=1/8;
#declare Font="cyrvetic.ttf"

#declare Xval=-6.0;

#while (Xval <= 6.0)
  sphere{<Xval,exp(Xval),0>,Rad pigment{color rgb<1,0.2,0>}}

  #if (Xval != 0.0)
    sphere{<Xval,pow(Xval,-1),0>,Rad pigment{color rgb<0.2,0.7,0>}}
  #end

  sphere{<Xval,pow(Xval,2),0>,Rad pigment{Blue}}
  sphere{<Xval,pow(Xval,3),0>,Rad pigment{Cyan}}

  #if (Xval > 0.0)
    sphere{<Xval,ln(Xval),0>,Rad pigment{Magenta}}
  #end

  #declare Xval=Xval+0.02;
#end

 text{ttf Font "Y=exp(X)",0.1,0    translate <-6.5, 0.5,0> pigment{color rgb<1,0.2,0>}}
 text{ttf Font "Y=pow(X,-1)",0.1,0 translate <-6.5,-1.5,0> pigment{color rgb<0.2,0.7,0>}}
 text{ttf Font "Y=pow(X,2)",0.1,0  translate <-6.5, 3,0>   pigment{Blue}}
 text{ttf Font "Y=pow(X,3)",0.1,0  translate <-6.5,-4,0>   pigment{Cyan}}
 text{ttf Font "Y=ln(X)",0.1,0    translate < 2.5, 2,0>   pigment{Magenta}}

camera {
   location  <0, 0, -120>
   angle 7 // direction <0, 0,  12>
   right x*image_width/image_height
   look_at   <0, 0,   0>
}

light_source { <5000, 10000, -20000> color White}
plane { -z, -Rad pigment {checker color rgb <1,1,1>*1.2 color rgb <1,1,.8>} }

union{ // X-axis
 cylinder{-x*5.5,x*5.5,.1}
 cone{-x*6.5,0,-x*5.5,.2}
 cone{ x*6.5,0, x*5.5,.2}
 translate z*Rad
 pigment{rgb<1,.8,1>}
}

union{ // Y-axis
 cylinder{-y*4,y*4,.1}
 cone{-y*5,0,-y*4,.2}
 cone{ y*5,0, y*4,.2}
 translate z*Rad
 pigment{rgb<.8,1,1>}
}

union{ // Axes labels
 text{ttf Font "X",0.1,0 translate <5.5,-1,0>}
 text{ttf Font "Y",0.1,0 translate <-.75,4,0>}
 pigment{rgb<1,.4,0>}
}