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"Nathan Kopp" <pov### [at] nkopp mailshellcom> wrote:
> Using more photons would probably improve the photon brightness estimate and
> increase the brightness.
>
> -Nathan
Hi, I'm also trying to find out how photons are working.
The first thing i noticed, photons without radiosity are senseless. Somehow
they look unrealistic and they are not bright enough. But maybe thats a
reason of my scene.
If You want to have more brighter photons You can do the following :
Multipy the color-statement in You lightsource by 2 or 3 and render the
image with save photons turned on. Then change back the light intensity to
normal, render again with photons, but load the photon map this time. Your
scene will be illuminate like normal, but much brighter photons will
appear.
The image in
http://news.povray.org/web.415ab576364ff56a6b3522e90%40news.povray.org was
created like that.
To make it more easy I'm using some little macros to switch between some
radiosity and photon setting.
#declare Radiosity = off; // on/off switch radiosity, settings
#if (Radiosity) // below
Radiosity_Brightness (2, 1, on, on, 1 )
#end
#declare Photons = off; // on/off switch photons, settings below
#declare P_Preview = off;
#if (Photons)
Photons_Quality ( 0.01, 1, 5, 1)
#end
//#macro Radiosity_Brightness ( type, brightness, normal, media, File )
//
// Type : [0] = Radiosity_Default
// [1] = Radiosity_Debug
// [2] = Radiosity_Fast
// [3] = Radiosity_Normal
// [4] = Radiosity_2Bounce
// [5] = Radiosity_Final
// [6] = Radiosity_OutdoorLQ
// [7] = Radiosity_OutdoorHQ
// [8] = Radiosity_OutdoorLight
// [9] = Radiosity_IndoorLQ
// [10] = Radiosity_IndoorHQ
//
// Brightness : [value] is multiplied with brightness=1
//
// normal : [on/off] Radiosity with normal
//
// media : [on/off] Radiosity with media
//
// File : [0] = do no file operation
// [1] = saves a specified radiosity.txt
// [2] = loads a specified radiosity.txt
//
#macro Radiosity_Brightness (Rt, Rb, Normal, Media, RFile)
#include "rad_def.inc"
global_settings
{ assumed_gamma 2.2
ambient_light color rgb <1.0,1.0,1.0>
max_trace_level 4
radiosity { Rad_Settings(Rt, Normal,Media)
brightness 1*Rb
normal Normal
media Media
#switch (RFile)
#case (0)
#break
#case (1)
save_file "C:TEMPScene_radiosity.txt"
#break
#case (2)
load_file "C:TEMPScene_radiosity.txt"
#break
#end } }
#end
//#macro Photons_Quality (Spacing, Jitter, max_trace_level, File)
//
// Spacing : same as spacing [0.01..0.05]
//
// Jitter : same as jitter [0..1]
//
// max_tr_lev : max_trace_level
//
// File : [0] = do no file operation
// [1] = saves a specified photons.txt
// [2] = loads a specified photons.txt
//
////#declare Photons = off; // on/off switch photons, settings
below
//// #if (Photons)
//// Photons_Quality ( 0.01, 1, 5, 1)
//// #end
//
//
//
#macro Photons_Quality (Sp, Ji, mtl, PFile)
global_settings { assumed_gamma 2.2
photons {
spacing Sp // specify the density of photons
gather 35, 250 // amount of photons gathered
// during render [20, 100]
media 35, 250 // media photons max_steps
[,factor]
jitter Ji // jitter phor photon rays
max_trace_level mtl // optional separate
max_trace_level
adc_bailout 0.01 // see global adc_bailout
//autostop 0 // photon autostop option
//radius 10 // manually specified search radius
// (---Adaptive Search Radius---)
//steps 1
//expand_thresholds 0.2, 40
#switch (PFile)
#case (0)
#break
#case (1)
save_file "C:TEMPScene_photons.txt"
#break
#case (2)
load_file "C:TEMPScene_photons.txt"
#break
#end}}
#end
Shu.
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Sorry for the mistakes, this one should work fine.
> Hi, I'm also trying to find out how photons are working.
> The first thing i noticed, photons without radiosity are senseless. Somehow
> they look unrealistic and they are not bright enough. But maybe thats a
> reason of my scene.
> If You want to have more brighter photons You can do the following :
>
> Multipy the color-statement in You lightsource by 2 or 3 and render the
> image with save photons turned on. Then change back the light intensity to
> normal, render again with photons, but load the photon map this time. Your
> scene will be illuminate like normal, but much brighter photons will
> appear.
> The image in
> http://news.povray.org/web.415ab576364ff56a6b3522e90%40news.povray.org was
> created like that.
>
> To make it more easy I'm using some little macros to switch between some
> radiosity and photon setting.
>
> #declare Radiosity = off; // on/off
> #if (Radiosity)
> Radiosity_Brightness (2, 1, on, on, 1 )
> #end
> #declare Photons = off; // on/off
> #declare P_Preview = off;
> #if (Photons)
> Photons_Quality ( 0.01, 1, 5, 1)
> #end
>
>
> //#macro Radiosity_Brightness ( type, brightness, normal, media, File )
> //
> // Type : [0] = Radiosity_Default
> // [1] = Radiosity_Debug
> // [2] = Radiosity_Fast
> // [3] = Radiosity_Normal
> // [4] = Radiosity_2Bounce
> // [5] = Radiosity_Final
> // [6] = Radiosity_OutdoorLQ
> // [7] = Radiosity_OutdoorHQ
> // [8] = Radiosity_OutdoorLight
> // [9] = Radiosity_IndoorLQ
> // [10] = Radiosity_IndoorHQ
> //
> // Brightness : [value] is multiplied with brightness=1
> //
> // normal : [on/off] Radiosity with normal
> //
> // media : [on/off] Radiosity with media
> //
> // File : [0] = do no file operation
> // [1] = saves a specified radiosity.txt
> // [2] = loads a specified radiosity.txt
> //
> #macro Radiosity_Brightness (Rt, Rb, Normal, Media, RFile)
> #include "rad_def.inc"
> global_settings
> { assumed_gamma 2.2
> ambient_light color rgb <1.0,1.0,1.0>
> max_trace_level 4
> radiosity { Rad_Settings(Rt, Normal,Media)
> brightness 1*Rb
> normal Normal
> media Media
> #switch (RFile)
> #case (0)
> #break
> #case (1)
> save_file "File"
> #break
> #case (2)
> load_file "File"
> #break
> #end } }
> #end
>
>
>
>
>
> //#macro Photons_Quality (Spacing, Jitter, max_trace_level, File)
> //
> // Spacing : same as spacing [0.01..0.05]
> //
> // Jitter : same as jitter [0..1]
> //
> // max_tr_lev : max_trace_level
> //
> // File : [0] = do no file operation
> // [1] = saves a specified photons.txt
> // [2] = loads a specified photons.txt
> //
> #macro Photons_Quality (Sp, Ji, mtl, PFile)
> global_settings { assumed_gamma 2.2
> photons {
> spacing Sp
> gather 35, 250
> media 35, 250
> jitter Ji
> max_trace_level mtl
> adc_bailout 0.01
> //autostop 0
> //radius 10
> // (---Adaptive Search Radius---)
> //steps 1
> //expand_thresholds 0.2, 40
> #switch (PFile)
> #case (0)
> #break
> #case (1)
> save_file "File"
> #break
> #case (2)
> load_file "File"
> #break
> #end}}
> #end
>
>
>
>
> Shu.
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