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Could somebody kindly post complete code for a very simple scene that uses
radiosity? Maybe a white plane with a white box and nothing else. No matter
what I try, I get either blackness or no effect. Something's not clicking I
guess :(
Thank you!
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On 6-11-2012 6:58, taftj wrote:
> Could somebody kindly post complete code for a very simple scene that uses
> radiosity? Maybe a white plane with a white box and nothing else. No matter
> what I try, I get either blackness or no effect. Something's not clicking I
> guess :(
>
> Thank you!
>
>
Take one of the basic scenes from the Insert Menu, and add the following
block (using version 3.7 btw):
global_settings {
adc_bailout 0.003922
assumed_gamma 1.0
max_trace_level 10
number_of_waves 10
noise_generator 2
radiosity {
brightness 1.0
count 100, 500
error_bound 1.8
gray_threshold 0.0
low_error_factor 0.5
minimum_reuse 0.015
nearest_count 10, 5
recursion_limit 2
adc_bailout 0.01
media off
normal off
always_sample off
pretrace_start 0.08
pretrace_end 0.004
}
}
Thomas
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taftj wrote:
> Could somebody kindly post complete code for a very simple scene that uses
> radiosity? Maybe a white plane with a white box and nothing else. No matter
> what I try, I get either blackness or no effect. Something's not clicking I
> guess :(
Try this:
#default {finish {ambient 0}}
#include "colors.inc"
#include "rad_def.inc"
global_settings
{
assumed_gamma 1.0
radiosity {Rad_Settings(Radiosity_Normal, off, off)}
}
camera
{
location <0.0, 1.0, -3.0>
look_at <0.0, 1.0, 0.0>
angle 90
}
light_source {< -10, 10, -10> color White}
sphere
{
0, 1000 pigment {color SkyBlue} hollow
}
plane {y, 0 pigment{checker color White color Black}}
sphere {y,1 pigment {color White}}
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Christian Froeschlin <chr### [at] chrfr de> wrote:
> taftj wrote:
> > Could somebody kindly post complete code for a very simple scene that uses
> > radiosity? Maybe a white plane with a white box and nothing else. No matter
> > what I try, I get either blackness or no effect. Something's not clicking I
> > guess :(
>
> Try this:
>
>
> #default {finish {ambient 0}}
>
> #include "colors.inc"
> #include "rad_def.inc"
>
> global_settings
> {
> assumed_gamma 1.0
> radiosity {Rad_Settings(Radiosity_Normal, off, off)}
> }
>
> camera
> {
> location <0.0, 1.0, -3.0>
> look_at <0.0, 1.0, 0.0>
> angle 90
> }
>
>
> light_source {< -10, 10, -10> color White}
>
> sphere
> {
> 0, 1000 pigment {color SkyBlue} hollow
> }
>
> plane {y, 0 pigment{checker color White color Black}}
>
> sphere {y,1 pigment {color White}}
Thank you- that did work, but apparently I'm still not understanding something
because when I remove the light source I see blackness. I thought the point of
radiosity was that there was some "general" light without needing a specific
light source.
So I was expecting that even without an explicitly defined light source there
would still be some light.
Kind of like this:
http://www.povray.org/documentation/images/tutorial/radB_01.jpg
I also tried making the SkyBlue sphere glow by adding finish{ambient 1} to it's
definition, but still got blackness. What am I missing?
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On 11/07/2012 10:08 PM, taftj wrote:
> Christian Froeschlin <chr### [at] chrfrde> wrote:
>> taftj wrote:
>>> Could somebody kindly post complete code for a very simple scene that uses
>>> radiosity? Maybe a white plane with a white box and nothing else. No matter
>>> what I try, I get either blackness or no effect. Something's not clicking I
>>> guess :(
>>
>> Try this:
>>
>>
>> #default {finish {ambient 0}}
>>
>> #include "colors.inc"
>> #include "rad_def.inc"
>>
>> global_settings
>> {
>> assumed_gamma 1.0
>> radiosity {Rad_Settings(Radiosity_Normal, off, off)}
>> }
>>
>> camera
>> {
>> location <0.0, 1.0, -3.0>
>> look_at <0.0, 1.0, 0.0>
>> angle 90
>> }
>>
>>
>> light_source {< -10, 10, -10> color White}
>>
>> sphere
>> {
>> 0, 1000 pigment {color SkyBlue} hollow
>> }
>>
>> plane {y, 0 pigment{checker color White color Black}}
>>
>> sphere {y,1 pigment {color White}}
>
> Thank you- that did work, but apparently I'm still not understanding something
> because when I remove the light source I see blackness. I thought the point of
> radiosity was that there was some "general" light without needing a specific
> light source.
>
> So I was expecting that even without an explicitly defined light source there
> would still be some light.
>
> Kind of like this:
>
> http://www.povray.org/documentation/images/tutorial/radB_01.jpg
>
> I also tried making the SkyBlue sphere glow by adding finish{ambient 1} to it's
> definition, but still got blackness. What am I missing?
>
Because if using radiosity is used any ambient term are effectively zero
... try emission instead
http://wiki.povray.org/content/Reference:Finish#Emission
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Am 08.11.2012 04:08, schrieb taftj:
> Thank you- that did work, but apparently I'm still not understanding something
> because when I remove the light source I see blackness. I thought the point of
> radiosity was that there was some "general" light without needing a specific
> light source.
No, the main point of radiosity is that shadows are illuminated by
diffuse light from other objects.
A side effect of radiosity is that you /can/ also get illumination from
a sky sphere or background (this is automatic), and even objects (this
requires a suitable finish setting; previously this could be done by
using a non-zero "ambient" finish term, but this was originally just a
hack and has always been troublesome, so as of POV-Ray 3.7 the new
"emission" term needs to be used instead).
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On 11/6/2012 3:14 AM, Thomas de Groot wrote:
> On 6-11-2012 6:58, taftj wrote:
>> Could somebody kindly post complete code for a very simple scene that
>> uses
>> radiosity? Maybe a white plane with a white box and nothing else. No
>> matter
>> what I try, I get either blackness or no effect. Something's not
>> clicking I
>> guess :(
>>
>> Thank you!
>>
>>
>
> Take one of the basic scenes from the Insert Menu, and add the following
> block (using version 3.7 btw):
>
> global_settings {
> adc_bailout 0.003922
> assumed_gamma 1.0
> max_trace_level 10
> number_of_waves 10
> noise_generator 2
> radiosity {
> brightness 1.0
> count 100, 500
> error_bound 1.8
> gray_threshold 0.0
> low_error_factor 0.5
> minimum_reuse 0.015
> nearest_count 10, 5
> recursion_limit 2
> adc_bailout 0.01
> media off
> normal off
> always_sample off
> pretrace_start 0.08
> pretrace_end 0.004
> }
> }
>
> Thomas
>
>
Hi Thomas,
I know this is kind of an old message, but I'm hoping you are still out
there...
I tried your suggestion with several of the canned examples from the
insert menu and have found an unexpected (by me) result.
On scenes such as Basic_Scene_05: Grass with small clouds in sky, your
settings cause the sky to go from a bright sunny blue sky in the
original scene, to a dark, grey, stormy-looking sky.
I was wondering if you, or anyone else, could explain what is going on.
I'm using POVray 3.7 RC7.
Todd
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On 19-6-2013 16:48, Todd Carnes wrote:
> Hi Thomas,
>
> I know this is kind of an old message, but I'm hoping you are still out
> there...
>
> I tried your suggestion with several of the canned examples from the
> insert menu and have found an unexpected (by me) result.
>
> On scenes such as Basic_Scene_05: Grass with small clouds in sky, your
> settings cause the sky to go from a bright sunny blue sky in the
> original scene, to a dark, grey, stormy-looking sky.
>
> I was wondering if you, or anyone else, could explain what is going on.
>
> I'm using POVray 3.7 RC7.
Elementary, my dear Watson ;-)
The basic scene comes from an older version of POV. In version 3.7, the
ambient parameter in finish does not work as before. You have to replace
it by emission and the scene renders correctly.
Thomas
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On 6/19/2013 10:59 AM, Thomas de Groot wrote:
> Elementary, my dear Watson ;-)
>
> The basic scene comes from an older version of POV. In version 3.7, the
> ambient parameter in finish does not work as before. You have to replace
> it by emission and the scene renders correctly.
>
> Thomas
Thank you for the prompt answer. :)
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Musing...
It is not a /bug/ strictly speaking, as the scene renders correctly in
its original state, without the radiosity block. The reason is
adequately described in the wiki Docs (section 1.3.5.3.2).
However, it is something to remain aware of when building scenes from
pre-defined ones.
Thomas
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