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Hellow!
Excuse, I don't speak English!
My OS - Fedora Linux 18
I write own exporter from Blender to Povray
For this purpose I study many examples
Everything was good
I already included in the exporter patterns and t-map for use of several
materials.
Now I want to include media.
Media scattering in examples in official documentation works operationally
Following example media scattering and photons doesn't works!
The reflective floor doesn't reflect yellow light on an opposite wall
I found other example in the Internet:
http://hsivonen.iki.fi/refl-light/
It too doesn't work.The render occurs without caustic drawing on an opposite
wall!
How to solve this problem?
I used 3.7RC6, then 3.7RC7, then 3.6.1 In total unsuccessfully
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Sorry! First post by "yes" - this is my post. Error input.
Problem Scattering media and photons in this code:
global_settings{
assumed_gamma 1
max_trace_level 10
photons {
count 300000
autostop 0
jitter .4
}
adc_bailout 1/10
}
#include "textures.inc"
#include "colors.inc"
camera {
location <0, 1, -4>
look_at <0, 2, 0>
angle 80
}
camera { location <14.9, 1, -8> look_at -z angle 70 }
light_source { <10,100,150>, 1 }
background { rgb <0.3, 0.6, 0.9> }
// A dim light source inside the room which does not
// interact with media so that we can see the room:
light_source { <14, -5, 2>, 0.5 media_interaction off photons { reflection off
} }
// Room
union
{ difference
{ box { <-11, -7, -11>, <16, 7, 10.5> }
box { <-10, -6, -10>, <15, 6, 10> }
box { <-4, -2, 9.9>, <2, 3, 10.6> }
}
box { <-1.25, -2, 10>, <-0.75, 3, 10.5> }
box { <-4, 0.25, 10>, <2, 0.75, 10.5> }
pigment { rgb 1 }
photons { target reflection on }
}
// Reflective floor:
box
{ <-10, -5.99, -10>, <15, -6, 10>
pigment { rgb 1 }
finish { reflection <0.5, 0.4, 0.2> }
photons { target reflection on}
}
// Scattering media box:
box
{ <-5, -6.5, -10.5>, <3, 6.5, 10.25>
pigment { rgbt 1 } hollow
interior
{ media
{ scattering { 1, 0.07 extinction 0.01 }
samples 30
}
}
}
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From: James Holsenback
Subject: Re: Media scattering and photons doesn't work!
Date: 12 May 2013 07:53:59
Message: <518f82d7$1@news.povray.org>
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On 05/12/2013 04:33 AM, LanuHum wrote:
> Sorry! First post by "yes" - this is my post. Error input.
> Problem Scattering media and photons in this code:
>
>
>
> global_settings{
> assumed_gamma 1
> max_trace_level 10
> photons {
> count 300000
> autostop 0
> jitter .4
> }
> adc_bailout 1/10
> }
>
> #include "textures.inc"
> #include "colors.inc"
> camera {
> location <0, 1, -4>
> look_at <0, 2, 0>
> angle 80
> }
>
>
>
> camera { location <14.9, 1, -8> look_at -z angle 70 }
> light_source { <10,100,150>, 1 }
> background { rgb <0.3, 0.6, 0.9> }
>
> // A dim light source inside the room which does not
> // interact with media so that we can see the room:
> light_source { <14, -5, 2>, 0.5 media_interaction off photons { reflection off
> } }
>
> // Room
> union
> { difference
> { box { <-11, -7, -11>, <16, 7, 10.5> }
> box { <-10, -6, -10>, <15, 6, 10> }
> box { <-4, -2, 9.9>, <2, 3, 10.6> }
> }
> box { <-1.25, -2, 10>, <-0.75, 3, 10.5> }
> box { <-4, 0.25, 10>, <2, 0.75, 10.5> }
> pigment { rgb 1 }
> photons { target reflection on }
> }
> // Reflective floor:
> box
> { <-10, -5.99, -10>, <15, -6, 10>
> pigment { rgb 1 }
> finish { reflection <0.5, 0.4, 0.2> }
> photons { target reflection on}
> }
> // Scattering media box:
> box
> { <-5, -6.5, -10.5>, <3, 6.5, 10.25>
> pigment { rgbt 1 } hollow
> interior
> { media
> { scattering { 1, 0.07 extinction 0.01 }
> samples 30
> }
> }
> }
>
>
I thought this example was very familiar ... it's basically from the the
tutorial section on media. You forgot /one/ important step. Have a look
at this section and see if you can spot it:
http://wiki.povray.org/content/Documentation:Tutorial_Section_3.7#Media_and_photons
BTW: you also have 2 camera definitions (one gets ignored ... see
warning stream)
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James Holsenback <nom### [at] none com> wrote:
>
> I thought this example was very familiar ... it's basically from the the
> tutorial section on media. You forgot /one/ important step. Have a look
> at this section and see if you can spot it:
>
> http://wiki.povray.org/content
>/Documentation:Tutorial_Section_3.7#Media_and_photons
> BTW: you also have 2 camera definitions (one gets ignored ... see
> warning stream)
Yes! This is it's basically from the the
tutorial section on media
I rewrote again
I followed an example above where there are no photons and added reflecting
floor and changed global settings
Look:
http://blender3d.org.ua/forum/rendering/iwe/upload/povray_gluk.png
//I don't know that I miss in this text.Help me please!
global_settings
{ photons
{ count 20000
media 100
}
}
camera { location <14.9, 1, -8> look_at -z angle 70 }
light_source { <10,100,150>, 1 }
background { rgb <0.3, 0.6, 0.9> }
// A dim light source inside the room which does not
// interact with media so that we can see the room:
light_source { <14, -5, 2>, 0.5 media_interaction off }
// Room
union
{ difference
{ box { <-11, -7, -11>, <16, 7, 10.5> }
box { <-10, -6, -10>, <15, 6, 10> }
box { <-4, -2, 9.9>, <2, 3, 10.6> }
}
box { <-1.25, -2, 10>, <-0.75, 3, 10.5> }
box { <-4, 0.25, 10>, <2, 0.75, 10.5> }
pigment { rgb 1 }
}
// Reflective floor:
box
{ <-10, -5.99, -10>, <15, -6, 10>
pigment { rgb 1 }
finish { reflection <0.5, 0.4, 0.2> }
photons { target reflection on }
}
// Scattering media box:
box
{ <-5, -6.5, -10.5>, <3, 6.5, 10.25>
pigment { rgbt 1 } hollow
interior
{ media
{ scattering { 1, 0.07 extinction 0.01 }
samples 30
}
}
}
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From: James Holsenback
Subject: Re: Media scattering and photons doesn't work!
Date: 12 May 2013 11:13:42
Message: <518fb1a6$1@news.povray.org>
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On 05/12/2013 09:20 AM, LanuHum wrote:
> // Scattering media box:
> box
> { <-5, -6.5, -10.5>, <3, 6.5, 10.25>
> pigment { rgbt 1 } hollow
> interior
> { media
> { scattering { 1, 0.07 extinction 0.01 }
> samples 30
> }
> }
> }
3rd paragraph in the passage I previously pointed you to ...
// Scattering media box:
box
{ <-5, -6.5, -10.5>, <3, 6.5, 10.25>
pigment { rgbt 1 } hollow
photons { pass_through }
interior
{ media
{ scattering { 1, 0.07 extinction 0.01 }
samples 30
}
}
}
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James Holsenback <nom### [at] nonecom> wrote:
>
> 3rd paragraph in the passage I previously pointed you to ...
>
> // Scattering media box:
> box
> { <-5, -6.5, -10.5>, <3, 6.5, 10.25>
> pigment { rgbt 1 } hollow
>
>
> photons { pass_through }
>
>
> interior
> { media
> { scattering { 1, 0.07 extinction 0.01 }
> samples 30
> }
> }
> }
Yes!
Thanks!
Thanks! Thank you!
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From: Alain
Subject: Re: Media scattering and photons doesn't work!
Date: 12 May 2013 20:36:12
Message: <5190357c@news.povray.org>
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> Hellow!
> Excuse, I don't speak English!
> My OS - Fedora Linux 18
> I write own exporter from Blender to Povray
> For this purpose I study many examples
> Everything was good
> I already included in the exporter patterns and t-map for use of several
> materials.
> Now I want to include media.
> Media scattering in examples in official documentation works operationally
> Following example media scattering and photons doesn't works!
> The reflective floor doesn't reflect yellow light on an opposite wall
> I found other example in the Internet:
> http://hsivonen.iki.fi/refl-light/
> It too doesn't work.The render occurs without caustic drawing on an opposite
> wall!
>
> How to solve this problem?
> I used 3.7RC6, then 3.7RC7, then 3.6.1 In total unsuccessfully
>
>
>
>
>
You realy need to enable photons maping.
For that, you add a photons block in the global_settings block:
global_settings{photons{spacing 0.1}}
This will make ALL light_source, except shadowless ones, emit photons
toward any object having a photons block with target.
To make photons visible in a media, you also need to turn it on for medias:
global_settings{photons{spacing 0.1 media 10}}
Now, you need to set your reflective and refractive objects at photons
target:
in the object definition, add this:
photons{target reflection on}// turn on reflection
OR
photons{target reflection on refraction on}
// turn on reflection AND refraction
If you have some transparent object between the light_source and target
object, that transparent object will block the photons. To prevent that,
add this to the problem object:
photons{pass_through}
To prevent it from interacting with primary photons.
Also, if you have some container for your media, it to must be set as
pass_through.
Please read the included documentation to get further informations.
By the way, here are some media tips:
The default sampling method is method 3
The default samples value is samples 10
The default intervals value is 1 and must be left unchanged.
If you need beter sampling, increase samples, NEVER intervals.
Increasing intervals have a HUGE negative impact on your rendering
speed, increasing samples have minimal impact. For example,
samples 100 intervals 1
is realy much faster than
samples 5 intervals 10
for twice the samples.
samples use ONLY the first provided value. Any second value will be
silently ignored.
ratio, variance and confidence are NOT used and will be silently
ignored. They are used ONLY if you use method 1 or 2.
Alain
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James Holsenback <nom### [at] nonecom> wrote:
>
> 3rd paragraph in the passage I previously pointed you to ...
>
> // Scattering media box:
> box...
I thought the only problem was the missing media statement in global_settings
:-/ I should have looked more closely at the code.
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Thanks a lot for dialog continuation
My first task to set export of parameters.
For this purpose it is necessary for me that everything was correctly assigned
Povray has very difficult logic
I didn't assume that examples in documentation - riddles
I considered that the example will show that shall be.
Your information is useful to me for further study
While it is important for Python:
[code]
if obj.use_media_scattering:
file.write("photons { pass_through }")
[/code]
Once again, many thanks!
I still will ask you for the help!
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Hi.
Problem:
http://yadi.sk/d/NZMlm3V67GSZa
1. if scattering box == false and global setting photons == true:
good image with photons
2. if scattering box == true and global setting photons == false:
good image with scattering
3. if scattering box == true and global setting photons == true:
bad image with scattering and photons!
in scattering box: photons { pass_through }
but scattering box is visible :(
why scattering box is visible?
my code:
//----------------------------------------------
//--Exported with POV-Ray exporter for Blender--
//----------------------------------------------
#version 3.7;
//--Global settings and background--
global_settings {
assumed_gamma 1
max_trace_level 5
photons {
count 200000
media 100
}
}
background {rgbt<0.0517, 0.563, 1, 0>}
//--Material Definitions--
#declare Texture_2_Cube_000 = pigment {color rgb<0,0,0>}
#declare Texture_2_Cube_001 = pigment {color rgb<0,0,0>}
#declare shader_Material_000 = finish {
reflection {
<0.1,0.41,0.0439>
}
}
#declare Texture_1_Cube_000 = texture {pigment {rgb 1}
finish {shader_Material_000}}
#declare shader_Material_001 = finish {
brilliance 2
diffuse 0.8 0
}
#declare Texture_1_Cube_001 = texture {pigment {color rgbft<0.8,0.8,0.8,0,0>}
finish {shader_Material_001}}
//--Mesh objects--
#declare T_Map_Cube_000 = pigment {rgb 0}
#declare Cube_000_tex = texture { pigment_pattern { T_Map_Cube_000 }texture_map{
[0.0 Texture_1_Cube_000] [1.0 Texture_2_Cube_000]}}
#declare Cube_000 =
mesh {
triangle {<-17.36,-10.29,17.36>,<-17.36,-10.29,-17.36>,<17.36,-10.29,17.36>}
triangle {<-17.36,-10.29,-17.36>,<17.36,-10.29,-17.36>,<17.36,-10.29,17.36>}
texture {Cube_000_tex}
photons {reflection on target 0.0002}
}
object {Cube_000}
#declare T_Map_Cube_001 = pigment {rgb 0}
#declare Cube_001_tex = texture { pigment_pattern { T_Map_Cube_001 }texture_map{
[0.0 Texture_1_Cube_001] [1.0 Texture_2_Cube_001]}}
#declare Cube_001 =
mesh {
triangle {<-17.36,10.29,17.36>,<-17.36,10.29,-17.36>,<-17.36,-10.29,17.36>}
triangle {<-17.36,10.29,-17.36>,<17.36,10.29,-17.36>,<-12.54,6.876,-17.36>}
triangle {<17.36,10.29,-17.36>,<17.36,10.29,17.36>,<17.36,-10.29,-17.36>}
triangle {<17.36,10.29,17.36>,<-17.36,10.29,17.36>,<17.36,-10.29,17.36>}
triangle {<17.36,10.29,17.36>,<17.36,10.29,-17.36>,<-17.36,10.29,17.36>}
triangle
{<-17.36,-10.29,-17.36>,<-17.36,10.29,-17.36>,<-12.54,6.876,-17.36>}
triangle {<17.36,10.29,-17.36>,<17.36,-10.29,-17.36>,<-4.857,6.876,-17.36>}
triangle
{<17.36,-10.29,-17.36>,<-17.36,-10.29,-17.36>,<-12.54,2.322,-17.36>}
triangle {<-4.857,2.322,-17.36>,<-12.54,2.322,-17.36>,<-4.857,2.322,-18.74>}
triangle {<-12.54,2.322,-17.36>,<-12.54,6.876,-17.36>,<-12.54,2.322,-18.74>}
triangle {<-12.54,6.876,-17.36>,<-4.857,6.876,-17.36>,<-12.54,6.876,-18.74>}
triangle {<-4.857,6.876,-17.36>,<-4.857,2.322,-17.36>,<-4.857,6.876,-18.74>}
triangle
{<-17.36,10.29,-17.36>,<-17.36,-10.29,-17.36>,<-17.36,-10.29,17.36>}
triangle {<17.36,10.29,-17.36>,<-4.857,6.876,-17.36>,<-12.54,6.876,-17.36>}
triangle {<17.36,10.29,17.36>,<17.36,-10.29,17.36>,<17.36,-10.29,-17.36>}
triangle {<-17.36,10.29,17.36>,<-17.36,-10.29,17.36>,<17.36,-10.29,17.36>}
triangle {<17.36,10.29,-17.36>,<-17.36,10.29,-17.36>,<-17.36,10.29,17.36>}
triangle
{<-12.54,2.322,-17.36>,<-17.36,-10.29,-17.36>,<-12.54,6.876,-17.36>}
triangle {<17.36,-10.29,-17.36>,<-4.857,2.322,-17.36>,<-4.857,6.876,-17.36>}
triangle {<-4.857,2.322,-17.36>,<17.36,-10.29,-17.36>,<-12.54,2.322,-17.36>}
triangle {<-12.54,2.322,-17.36>,<-12.54,2.322,-18.74>,<-4.857,2.322,-18.74>}
triangle {<-12.54,6.876,-17.36>,<-12.54,6.876,-18.74>,<-12.54,2.322,-18.74>}
triangle {<-4.857,6.876,-17.36>,<-4.857,6.876,-18.74>,<-12.54,6.876,-18.74>}
triangle {<-4.857,2.322,-17.36>,<-4.857,2.322,-18.74>,<-4.857,6.876,-18.74>}
texture {Cube_001_tex}
}
object {Cube_001}
//--Lamps--
light_source {
<-5.08,104,-132>
color rgb<1, 1, 1>
parallel
point_at <0, 0, -1>
}
light_source {
<0,0,0>
color rgb<0.5, 0.5, 0.5>
media_interaction off
}
//--Cameras--
camera {
perspective
location <0, 0, 0>
look_at <0, 0, -1>
right <-1.7777777777777777, 0, 0>
up <0, 1, 0>
angle 96.805211
rotate <-0.194128, 89.999996, 0.000000>
translate <16.497437, 5.343666, -0.000000>
}
//--Scattering media box--
box {
<-12.06,43.79,-27.81>,
<-0.03095,-11.48,17.8>
pigment { rgbt 1 } hollow
photons { pass_through }
interior {
media {
scattering { 1,
<0.06998, 0.06998, 0.06998>
extinction 0.01 }
samples 100
}}}
Thanks!
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