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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
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