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+// 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 Ray Tracer Scene Description File
+// File: gamma_showcase.pov
+// Vers: 3.7
+// Desc: Gamma Handling Test Scene - An arrangement of spheres on a marble plane
+// Date: 2010-12-21
+// Auth: Christoph Lipka
+// MORE INFORMATION: http://wiki.povray.org/content/Documentation:Tutorial_Section_3.3#Gamma_Handling
+//
+
+// +w640 +h480 +a0.3 +am1 +fN -d File_Gamma=sRGB Output_File_Name=gamma_showcase.png
+// +w640 +h480 +a0.3 +am1 +fN -d File_Gamma=1.0  Output_File_Name=gamma_showcase_linear.png
+// +w320 +h240 +a0.3 +am1 +fN -d File_Gamma=sRGB Output_File_Name=gamma_showcase_ref0.png Declare=Stripes=off
+// +w320 +h240 +a0.3 +am1 +fN -d File_Gamma=sRGB Output_File_Name=gamma_showcase_ref1.png Declare=Stripes=off Declare=Gamma=1.2
+// +w320 +h240 +a0.3 +am1 +fN -d File_Gamma=sRGB Output_File_Name=gamma_showcase_ref2.png Declare=Stripes=off Declare=Gamma=0.8
+// +w640 +h480 +a0.3 +am1 -f +d
+
+#version 3.7;
+
+#include "colors.inc"
+#include "stones.inc"
+
+#ifndef (Stripes)
+  #declare Stripes = on;
+#end
+#ifndef (Gamma)
+  #declare Gamma   = 1.0;
+#end
+
+global_settings {
+  max_trace_level 5
+  assumed_gamma 1.0
+  radiosity {
+    pretrace_start 0.08
+    pretrace_end   0.01
+    count 35
+    nearest_count 5
+    error_bound 1.8
+    recursion_limit 2
+    low_error_factor .5
+    gray_threshold 0.0
+    minimum_reuse 0.015
+    brightness 1
+    adc_bailout 0.01/2
+  }
+}
+
+#default {
+  texture {
+    pigment {rgb 1}
+    finish {
+      ambient 0.0
+      diffuse 0.6
+      specular 0.6 roughness 0.001
+      reflection { 0.0 1.0 fresnel on }
+      conserve_energy
+    }
+  }
+}
+
+// ----------------------------------------
+
+#local TestRed   = rgb <0.5,0.1,0.1>;
+#local TestGreen = rgb <0.1,0.5,0.1>;
+#local TestBlue  = rgb <0.1,0.1,0.5>;
+
+#local CameraFocus = <0,0.5,0>;
+#local CameraDist  = 8;
+#local CameraDepth = 1.8;
+#local CameraTilt  = 20;
+
+camera {
+  location  <0,0,0>
+  direction z*CameraDepth
+  right     x*image_width/image_height
+  up        y
+  translate <0,0,-CameraDist>
+  rotate    x*CameraTilt
+  translate CameraFocus
+}
+
+#macro LightSource(Pos,Color)
+  light_source {
+    Pos
+    color Color
+    spotlight
+    point_at <0,0,0>
+    radius  175/vlength(Pos)
+    falloff 200/vlength(Pos)
+    area_light x*vlength(Pos)/10, y*vlength(Pos)/10, 9,9 adaptive 1 jitter circular orient
+  }
+  
+#end
+
+LightSource(<-500,500,-500>,TestRed   + <0.2,0.2,0.2>)
+LightSource(<   0,500,-500>,TestGreen + <0.2,0.2,0.2>)
+LightSource(< 500,500,-500>,TestBlue  + <0.2,0.2,0.2>)
+
+// ----------------------------------------
+
+#macro DarkStripeBW(TargetBrightness)
+  #if (TargetBrightness < 0.5)
+    (0.0)
+  #else
+    (TargetBrightness*2 - 1.0)
+  #end
+#end
+
+#macro BrightStripeBW(TargetBrightness)
+  #if (TargetBrightness < 0.5)
+    (TargetBrightness*2)
+  #else
+    (1.0)
+  #end
+#end
+
+#macro DarkStripeRGB(TargetColor)
+  <DarkStripeBW(TargetColor.red),DarkStripeBW(TargetColor.green),DarkStripeBW(TargetColor.blue)>
+#end
+
+#macro BrightStripeRGB(TargetColor)
+  <BrightStripeBW(TargetColor.red),BrightStripeBW(TargetColor.green),BrightStripeBW(TargetColor.blue)>
+#end
+
+#macro StripedPigment(TargetColor)
+  #if (Stripes)
+    function { abs(mod(abs(image_height*CameraDepth*y/z+0.5),2.0)-1.0) }
+    color_map {
+      [0.5 color rgb DarkStripeRGB(TargetColor) ]
+      [0.5 color rgb BrightStripeRGB(TargetColor) ]
+    }
+    translate <0,0,-CameraDist>
+    rotate x*CameraTilt
+    translate CameraFocus
+  #else
+    color TargetColor
+  #end
+#end
+
+
+plane {
+  y, 0
+  texture { T_Stone11 }
+  interior { ior 1.5 }
+}
+
+#macro GammaAdjust(C,G)
+  #local C2 = color rgbft <pow(C.red,G),pow(C.green,G),pow(C.blue,G),pow(C.filter,G),pow(C.transmit,G)>;
+  (C2)
+#end
+
+#macro TestSphere(Pos,Radius,TargetColor,Split)
+  sphere {
+    Pos + y*Radius, Radius
+    texture { pigment { color GammaAdjust(TargetColor,Gamma) } }
+    interior { ior 1.5 }
+  }
+  #if (Split)
+    sphere {
+      Pos + y*Radius + x*0.001, Radius
+      texture { pigment { StripedPigment(TargetColor) } }
+      interior { ior 1.5 }
+    }
+  #end
+#end
+
+TestSphere(<-2,0,1>, 1, TestRed,   true)
+TestSphere(< 0,0,1>, 1, TestGreen, true)
+TestSphere(< 2,0,1>, 1, TestBlue,  true)
+
+#local Steps = 6;
+#for(I,0,1,1/Steps)
+  #if (I < 0.5)
+    #local Color2 = TestRed;
+  #else
+    #local Color2 = TestBlue;
+  #end
+  #local P = abs(I-0.5)*2;
+  TestSphere(<I*4-2,0,-0.5>, 2/Steps, (1-P)*TestGreen + P*Color2, true)
+#end
+
+#local Steps = 8;
+#for(I,0,1,1/Steps)
+  TestSphere(<I*4-2,0,-1.5>, 2/Steps, rgb I, true)
+  TestSphere(<I*4-2,0,-2.0>, 2/Steps, GammaAdjust(rgb I, 2.2*Gamma), false)
+#end