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I have recently been experimenting with radiosity in POVRay but have had
no success. I am using Moray to control the radiosity settings in a
simple courtyard scene I created to test (based on this image:
http://www.lightscape.com/Contest98/az_honor.jpg, but just a bare bones
version). My problem is that the radiosity rendering is no different
from the raytraced rendering (yes I set POV to radiosity mode). That is,
it does not change any of the areas not lit by direct light, just one
big ambient colour mess, I can't make out any details in it, just what
would happen if I rendered without radiosity. So what am I doing wrong
(Other test renderings of other scenes have similar results)? HELP!!!
Thanks,
Chris Maryan
mailto:cma### [at] geocities com
***
My ideas are free,
Work is at least minimum wage.
***
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to the Chris Maryan needs money fund,
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In povray.general Chris Maryan <cma### [at] geocitiescom> wrote:
: I have recently been experimenting with radiosity in POVRay but have had
: no success. I am using Moray to control the radiosity settings in a
: simple courtyard scene I created to test (based on this image:
: http://www.lightscape.com/Contest98/az_honor.jpg, but just a bare bones
: version). My problem is that the radiosity rendering is no different
: from the raytraced rendering (yes I set POV to radiosity mode). That is,
: it does not change any of the areas not lit by direct light, just one
: big ambient colour mess, I can't make out any details in it, just what
: would happen if I rendered without radiosity. So what am I doing wrong
: (Other test renderings of other scenes have similar results)? HELP!!!
Radiosity parameters are really dificult to understand. I don't understand
them very well. You have to read the povray documentation very carefully to
get the right values.
I have been playing with radiosity as well, but with much better results.
You can check them at http://www.iki.fi/warp/pics/Radiosity_test/
I can post the radiosity values of those images if you want.
--
- Warp. -
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Nieminen Mika wrote:
> Radiosity parameters are really dificult to understand. I don't understand
> them very well. You have to read the povray documentation very carefully to
> get the right values.
> I have been playing with radiosity as well, but with much better results.
> You can check them at http://www.iki.fi/warp/pics/Radiosity_test/
> I can post the radiosity values of those images if you want.
Your images do a great job of showing what radiosity does, are you using
area lights in the top two images?
Thanks for your help but I solved the problem, apparently some kind of
bug (see my other post to povray.general on this thread).
Does anyone know how I can increase the amount of light being diffusely
reflected by a texture without raising the ambient level (My scene has a
wide range of contrast and if I keep the ambient low, there isn't enough
detail in the shadows, if I raise the ambient, the bright areas become
pure white, I need brighter shadows and darker highlights(I never
thought photography would come back to haunt me :-) ).
--
Chris Maryan
mailto:cma### [at] geocitiescom
***
My ideas are free,
Work is at least minimum wage.
***
Email me if you are interested in donating
to the Chris Maryan needs money fund.
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In povray.general Chris Maryan <cma### [at] geocitiescom> wrote:
: Your images do a great job of showing what radiosity does, are you using
: area lights in the top two images?
Yes.
--
- Warp. -
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Yes Please
Mike Hazelgrove
Nieminen Mika <war### [at] assaricctutfi> wrote in article
<35c9831f.0@news.povray.org>...
> In povray.general Chris Maryan <cma### [at] geocitiescom> wrote:
> : I have recently been experimenting with radiosity in POVRay but have
had
> : no success. I am using Moray to control the radiosity settings in a
> : simple courtyard scene I created to test (based on this image:
> : http://www.lightscape.com/Contest98/az_honor.jpg, but just a bare bones
> : version). My problem is that the radiosity rendering is no different
> : from the raytraced rendering (yes I set POV to radiosity mode). That
is,
> : it does not change any of the areas not lit by direct light, just one
> : big ambient colour mess, I can't make out any details in it, just what
> : would happen if I rendered without radiosity. So what am I doing wrong
> : (Other test renderings of other scenes have similar results)? HELP!!!
>
> Radiosity parameters are really dificult to understand. I don't
understand
> them very well. You have to read the povray documentation very carefully
to
> get the right values.
> I have been playing with radiosity as well, but with much better
results.
> You can check them at http://www.iki.fi/warp/pics/Radiosity_test/
> I can post the radiosity values of those images if you want.
>
> --
> - Warp. -
>
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> I have been playing with radiosity as well, but with much better
results.
> You can check them at http://www.iki.fi/warp/pics/Radiosity_test/
> I can post the radiosity values of those images if you want.
Very nice, very helpful. I would be interested in seeing the values you
used.
Jon
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In povray.general Jon Berndt <jsb### [at] hal-pcorg> wrote:
: Very nice, very helpful. I would be interested in seeing the values you
: used.
global_settings
{ ambient_light <1,1,1>*4
radiosity
{ brightness 8
count 400
distance_maximum 1
error_bound .2
gray_threshold .1
low_error_factor .5
minimum_reuse .001
nearest_count 6
recursion_limit 1
}
}
camera { location -z*17 look_at 0 }
// Room
difference
{ box { <-12,-9,-19><12,9,12> }
box { <-11,-8,-18><11,8,11> }
pigment { rgb <1,1,.8> }
}
box
{ <-11,-8,-18><-10.99,8,11>
pigment { rgb <1,.5,0> }
}
box
{ <11,-8,-18><10.99,8,11>
pigment { rgb <0,.5,1> }
}
--
- Warp. -
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I'm having the same problems with radiosity not working, with the exception
that mine works -some- of the time. I recall once that radiosity worked
after I removed one line, and that was the -ambient_light Black - line.
Then I put it back and it rendered with radiosity fine. I've yet to find a
pattern to radiosity not working after having tried over 75 renderings on
the same scene with small modifications. I used the settings below, having
the scale of my scene approximately that shown, and it did not correct any
problems. Is there a bug I should know about that may be causing this?
-D.J. Brown
Nieminen Mika wrote in message <35d1958f.0@news.povray.org>...
>In povray.general Jon Berndt <jsb### [at] hal-pcorg> wrote:
>: Very nice, very helpful. I would be interested in seeing the values you
>: used.
>
>global_settings
>{ ambient_light <1,1,1>*4
> radiosity
> { brightness 8
> count 400
> distance_maximum 1
> error_bound .2
> gray_threshold .1
> low_error_factor .5
> minimum_reuse .001
> nearest_count 6
> recursion_limit 1
> }
>}
>
>camera { location -z*17 look_at 0 }
>
>// Room
>difference
>{ box { <-12,-9,-19><12,9,12> }
> box { <-11,-8,-18><11,8,11> }
> pigment { rgb <1,1,.8> }
>}
>box
>{ <-11,-8,-18><-10.99,8,11>
> pigment { rgb <1,.5,0> }
>}
>box
>{ <11,-8,-18><10.99,8,11>
> pigment { rgb <0,.5,1> }
>}
>
>
>
>--
> - Warp. -
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HEY everbody ! Povray is now answering questions on this group.
WOW !
Ken
Povray wrote:
> I'm having the same problems with radiosity not working, with the exception
> that mine works -some- of the time. I recall once that radiosity worked
> after I removed one line, and that was the -ambient_light Black - line.
> Then I put it back and it rendered with radiosity fine. I've yet to find a
> pattern to radiosity not working after having tried over 75 renderings on
> the same scene with small modifications. I used the settings below, having
> the scale of my scene approximately that shown, and it did not correct any
> problems. Is there a bug I should know about that may be causing this?
>
> -D.J. Brown
> Nieminen Mika wrote in message <35d1958f.0@news.povray.org>...
> >In povray.general Jon Berndt <jsb### [at] hal-pcorg> wrote:
> >: Very nice, very helpful. I would be interested in seeing the values you
> >: used.
> >
> >global_settings
> >{ ambient_light <1,1,1>*4
> > radiosity
> > { brightness 8
> > count 400
> > distance_maximum 1
> > error_bound .2
> > gray_threshold .1
> > low_error_factor .5
> > minimum_reuse .001
> > nearest_count 6
> > recursion_limit 1
> > }
> >}
> >
> >camera { location -z*17 look_at 0 }
> >
> >// Room
> >difference
> >{ box { <-12,-9,-19><12,9,12> }
> > box { <-11,-8,-18><11,8,11> }
> > pigment { rgb <1,1,.8> }
> >}
> >box
> >{ <-11,-8,-18><-10.99,8,11>
> > pigment { rgb <1,.5,0> }
> >}
> >box
> >{ <11,-8,-18><10.99,8,11>
> > pigment { rgb <0,.5,1> }
> >}
> >
> >
> >
> >--
> > - Warp. -
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Sorry, didn't realize I had typed in "Povray" for the name.. Hehe... :)
(red-faced grin)
Ken wrote in message <35FE42E4.58A73427@pacbell.net>...
>HEY everbody ! Povray is now answering questions on this group.
>WOW !
>
>Ken
>
>Povray wrote:
>
>> I'm having the same problems with radiosity not working, with the
exception
>> that mine works -some- of the time. I recall once that radiosity worked
>> after I removed one line, and that was the -ambient_light Black - line.
>> Then I put it back and it rendered with radiosity fine. I've yet to find
a
>> pattern to radiosity not working after having tried over 75 renderings on
>> the same scene with small modifications. I used the settings below,
having
>> the scale of my scene approximately that shown, and it did not correct
any
>> problems. Is there a bug I should know about that may be causing this?
>>
>> -D.J. Brown
>> Nieminen Mika wrote in message <35d1958f.0@news.povray.org>...
>> >In povray.general Jon Berndt <jsb### [at] hal-pcorg> wrote:
>> >: Very nice, very helpful. I would be interested in seeing the values
you
>> >: used.
>> >
>> >global_settings
>> >{ ambient_light <1,1,1>*4
>> > radiosity
>> > { brightness 8
>> > count 400
>> > distance_maximum 1
>> > error_bound .2
>> > gray_threshold .1
>> > low_error_factor .5
>> > minimum_reuse .001
>> > nearest_count 6
>> > recursion_limit 1
>> > }
>> >}
>> >
>> >camera { location -z*17 look_at 0 }
>> >
>> >// Room
>> >difference
>> >{ box { <-12,-9,-19><12,9,12> }
>> > box { <-11,-8,-18><11,8,11> }
>> > pigment { rgb <1,1,.8> }
>> >}
>> >box
>> >{ <-11,-8,-18><-10.99,8,11>
>> > pigment { rgb <1,.5,0> }
>> >}
>> >box
>> >{ <11,-8,-18><10.99,8,11>
>> > pigment { rgb <0,.5,1> }
>> >}
>> >
>> >
>> >
>> >--
>> > - Warp. -
>
>
>
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In povray.general Povray <web### [at] ultisitecom> wrote:
: I'm having the same problems with radiosity not working, with the exception
: that mine works -some- of the time. I recall once that radiosity worked
: after I removed one line, and that was the -ambient_light Black - line.
: Then I put it back and it rendered with radiosity fine.
There must be some ambient light in order to the radiosity to be seen
(as you can see in my example code, it's even multiplied by 4, ie. 4 times
brighter ambient light than usual, so radiosity becomes very visible). If
you set the ambient light to 0, no radiosity is seen, of course.
I think that you typoed something when adding that line again. It's the
only reason I can think of.
: I've yet to find a
: pattern to radiosity not working after having tried over 75 renderings on
: the same scene with small modifications. I used the settings below, having
: the scale of my scene approximately that shown, and it did not correct any
: problems. Is there a bug I should know about that may be causing this?
Note that there's no "universal" radiosity settings which work fine in
every scene. The radiosity settings I posted work fine with the small room
in the same post, but they don't work fine in outdoor scenes, for example.
Each scene has its own specific optimal radiosity settings. This depends on
the scale of the scene, the brightness of the colors, etc.
Btw, are you sure you render with the +qr option when you want radiosity?
(without that option radiosity calculations are not made)
--
- Warp. -
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I've discovered the source of the problem, and you are most certainly
correct about the ambient light. The problem is that radiosity doesn't work
in subsequent requests if I cancel a trace. I have to close the Pov-Ray
editor and open it again, and it works fine. So, after yanking out the hair
around my ears for two days, I've finally got it down.
Thanks and much appreciation,
D.J. Brown
Nieminen Mika wrote in message <35ff7f4e.0@news.povray.org>...
>In povray.general Povray <web### [at] ultisitecom> wrote:
>: I'm having the same problems with radiosity not working, with the
exception
>: that mine works -some- of the time. I recall once that radiosity worked
>: after I removed one line, and that was the -ambient_light Black - line.
>: Then I put it back and it rendered with radiosity fine.
>
> There must be some ambient light in order to the radiosity to be seen
>(as you can see in my example code, it's even multiplied by 4, ie. 4 times
>brighter ambient light than usual, so radiosity becomes very visible). If
>you set the ambient light to 0, no radiosity is seen, of course.
> I think that you typoed something when adding that line again. It's the
>only reason I can think of.
>
>: I've yet to find a
>: pattern to radiosity not working after having tried over 75 renderings on
>: the same scene with small modifications. I used the settings below,
having
>: the scale of my scene approximately that shown, and it did not correct
any
>: problems. Is there a bug I should know about that may be causing this?
>
> Note that there's no "universal" radiosity settings which work fine in
>every scene. The radiosity settings I posted work fine with the small room
>in the same post, but they don't work fine in outdoor scenes, for example.
>Each scene has its own specific optimal radiosity settings. This depends on
>the scale of the scene, the brightness of the colors, etc.
> Btw, are you sure you render with the +qr option when you want radiosity?
>(without that option radiosity calculations are not made)
>
>--
> - Warp. -
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Chris Maryan <cma### [at] geocitiescom> writes:
> I have recently been experimenting with radiosity in POVRay but have had
> no success. I am using Moray to control the radiosity settings in a
> simple courtyard scene I created to test (based on this image:
> http://www.lightscape.com/Contest98/az_honor.jpg, but just a bare bones
> version). My problem is that the radiosity rendering is no different
> from the raytraced rendering (yes I set POV to radiosity mode). That is,
> it does not change any of the areas not lit by direct light, just one
> big ambient colour mess, I can't make out any details in it, just what
> would happen if I rendered without radiosity. So what am I doing wrong
> (Other test renderings of other scenes have similar results)? HELP!!!
I rendered my first scene that uses radiosity yesterday. So, I'm also
quite new to it. However, you didn't mention that you have set
distance_maximum. According to the docs this is essential.
A description of this parameter is found in section 7.8.9.2.3.
I hope this helps
--
Tho### [at] uni-konstanzde
http://www.fmi.uni-konstanz.de/~willhalm/
Tschieses lavs ju
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I've been able to solve my problem, it seems to be caused by stopping a
radiosity rendering from Moray before it's finished and then attempting
to render again. Anyway, the solution is to restart Moray and POV if you
stop a radiosity rendering before it's finished, otherwise the final
pass of the next rendering will turn out looking like a raytraced
rendering. I have yet to discover if this problem is in POVRay or the
way Moray controls POV.
Chris Maryan
mailto:cma### [at] geocitiescom
***
My ideas are free,
Work is at least minimum wage.
***
Email me if you are interested in donating
to the Chris Maryan needs money fund.
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Thomas Willhalm wrote:
> I rendered my first scene that uses radiosity yesterday. So, I'm also
> quite new to it. However, you didn't mention that you have set
> distance_maximum. According to the docs this is essential.
> A description of this parameter is found in section 7.8.9.2.3.
I've been playing around with my image (now that it works, see my other
reply in povray.general) and have come to the conclusion that
distance_maximum doesn't have as much of a bearing on the image as the
docs would have you believe, I tried values ranging from 1 (the distance
to the nearest object in my image) to 30(the total size of everything
visible in my image) and there have been no serious changes in the way
the scene renders.
--
Chris Maryan
mailto:cma### [at] geocitiescom
***
My ideas are free,
Work is at least minimum wage.
***
Email me if you are interested in donating
to the Chris Maryan needs money fund.
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Chris Maryan wrote in message <35C9ECA4.54C854DD@geocities.com>...
>I've been able to solve my problem, it seems to be caused by stopping a
>radiosity rendering from Moray before it's finished and then attempting
>to render again. Anyway, the solution is to restart Moray and POV if you
>stop a radiosity rendering before it's finished, otherwise the final
>pass of the next rendering will turn out looking like a raytraced
>rendering. I have yet to discover if this problem is in POVRay or the
>way Moray controls POV.
>
I have the same problem, working only with POV (I submitted a bug report).
Same diagnostic : radiosity doesn't work after interrupted rendering.
But the demo file included with POV does not seem to be affected by this
bug.
And I do not know why. ;(
Reply to: phi### [at] hotmailcom
NOT TO mdebar (I am just using his computer)
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