What is it and were do I get it. Google got no links to this file.
I have already downloaded and installed lightsys (though I'm not sure what
it's for or how it works). The Pretrace.pov or whatever it is called also
calls this include but it wasn't in the install. Signed Newbie.

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The include files from lightsys go into this folder:

C:Program FilesPOV-Ray for Windows v3.6include

And I pulled this chunk of code from one of the demo files:

// Include CIE color transformation macros by Ive
// used to convert spectrums and kelvin temperatures to RGB
#include "CIE.inc"
CIE_ChromaticAdaption(1) // turning off chromatic adaption for a
photographic look

// CIE Color system selection
//#declare My_ColSys = sRGB_ColSys;
//#declare My_ColSys = Adobe_ColSys;
//#declare My_ColSys = NTSC_ColSys;
#declare My_ColSys = CIE_ColSys;
//#declare My_ColSys = Beta_ColSys;
CIE_ColorSystem(My_ColSys)

// Change color system white point for lights
//CIE_ColorSystemWhitepoint(My_ColSys, Illuminant_A)    // tungsten 2856K
//CIE_ColorSystemWhitepoint(My_ColSys, Blackbody2Whitepoint(3200)) // Film
tungsten A
//CIE_ColorSystemWhitepoint(My_ColSys, Blackbody2Whitepoint(3400)) // Film
tungsten A
//CIE_ColorSystemWhitepoint(My_ColSys, Illuminant_F11)  // fluorescent 4000K
//CIE_ColorSystemWhitepoint(My_ColSys, Illuminant_D50)  // daylight 5000K
//CIE_ColorSystemWhitepoint(My_ColSys, Illuminant_D55)  // daylight 5500K
//CIE_ColorSystemWhitepoint(My_ColSys, Illuminant_D65)  // daylight 6504K
CIE_ColorSystemWhitepoint(My_ColSys, Illuminant_D75)  // daylight 7500K

// Main lightsys include
#include "lightsys.inc"
// Include predefined lumens, spectrums, kelvin temperatures
#include "lightsys_constants.inc"

// Brightness control (global light multiplier):
#declare Lightsys_Brightness=1/6; // adjust for a brighter/dimmer image
#declare Lightsys_ExposureFake=0.625; // experimental.. try 0.625 for an
eye-like adaptation

// Color filter (global color-correction):
#declare Lightsys_Filter=CC20Y; // Yellow CC filter for daylight
//#declare Lightsys_Filter=CC10M; // Magenta CC filter for fluorescents

// light colors from emissive spectrums
#declare Cl_Daylight    =Daylight(7500);
#declare Cl_Sunlight    =Blackbody(5500);

// textures with colors from reflective spectrums
#include "rspd_jvp.inc"
#include "rspd_aster.inc"
// change white point for reflective spectrums

I paste it into the scene file after the global settings and before the
camera and light settings.

And finally, a light that has a lightsys color, which in this instance in
Cl_Daylight:

//(CE.pz3) Sun
light_source {
              <-0.0179173,0.982228,2.67377> //light position
              Light_Color(Cl_Daylight,12)
              spotlight
              tightness 16
              falloff 15
              radius 7.5
              point_at <-0.0179173,-0.04145542,-2.142282>
                }

I'm still getting the hang of it myself, and there are a ton of options, but
this will get you started and feel free to ask follow up questions.

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"Fred Smith" <paj### [at] verizonnet> wrote:
> What is it and were do I get it. Google got no links to this file.
> I have already downloaded and installed lightsys.

Hi Fred,

you already downloaded "lightsys.inc"? And you don't have "CIE.inc"?

Take a look at

http://www.ignorancia.org/lightsys.php

you will find what you need.

Greetings, em-sigma

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