Well, I've been out of POVing for 3 weeks now. I hope I haven't lost my edge
(dull as it may be). I took MikeH's code and tweaked a bit. This is what I
got. It took a little over 1/2 hour to render at 400x400. I cropped it down
to 400x300. There is only one very faint shadowless light, which was put in
to bring out highlights I never put in. Hehe... wait a second... if it's
shadowless the highlights won't show up anyway... Doh! I have lost it... :)
Anyway, here it is. Enjoy.

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Attachments:
Download 'arnoldic3.jpg' (26 KB)

Preview of image 'arnoldic3.jpg'

Cool -- it looks like claymation.
I don't understand what the picture is about though :-)

--

Ian

Inkwell: Ian's Homepage
http://www.topcities.com/cartoon/inkwell/index.htm
"Tony[B]" <ben### [at] panamac-comnet> wrote in message
news:39a919ce@news.povray.org...
> Well, I've been out of POVing for 3 weeks now. I hope I haven't lost my
edge
> (dull as it may be). I took MikeH's code and tweaked a bit. This is what I
> got. It took a little over 1/2 hour to render at 400x400. I cropped it
down
> to 400x300. There is only one very faint shadowless light, which was put
in
> to bring out highlights I never put in. Hehe... wait a second... if it's
> shadowless the highlights won't show up anyway... Doh! I have lost it...
:)
> Anyway, here it is. Enjoy.
>
>
>

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The picture was about the shoes being presented in the center of the image.
Then I looked around for some more complex models and decided to stick in
Nick, my little clay Santa. I just put them together into the image. It's
not really about anything, just a test of the radiosity. BTW, I've just
finished an 800x800 version. It took 3hours 10mins and I notice the shadows
are still a bit splotchy so I'll bump up the count a bit to see if it helps
(it should... :)

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getting there definatly - no shadow definition, but if i remeber correctly
there is little of that in arnold!

Rick

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The clay santa is cool, and I recognize the sPatch elf shoes. :)

Pretty good radiosity I think.  My bunny animation is still rendering and should
be ready in another 3 hours or so.  It's taking 10 minutes per frame @320x240.
I heard that the Arnold renderings took about 5 minutes a frame at that rez, so
megapov does a pretty good job considering that it's not optimized for the
hemisphere light source.

-Mike

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How's the splotchiness of the shadow in yours? Did you manage to eliminate
it? I'm still tweaking with it to get some decent shadows. I've narrowed it
down to about this:

global_settings
{
 ini_option "+QR"
 radiosity
 {
  pretrace_start 0.16 pretrace_end 0.01
  count 260 nearest_count 4
  error_bound .06 recursion_limit 1
  low_error_factor 1 gray_threshold .5
  minimum_reuse .015 brightness 1.5
  normal on max_sample 1 adc_bailout 0.01/1
 }
}

What are you using?



BTW, thanks for the info. on the Arnold stuff. I had been wondering. :)

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> global_settings
> {
>  ini_option "+QR"
>  radiosity
>  {
>   pretrace_start 0.16 pretrace_end 0.01
>   count 260 nearest_count 4
>   error_bound .06 recursion_limit 1
>   low_error_factor 1 gray_threshold .5
>   minimum_reuse .015 brightness 1.5
>   normal on max_sample 1 adc_bailout 0.01/1
>  }
> }

I pretty much got rid of the spotty shadows, so the only remaining problem is
slight odd lighting near the edges of the patches.  Not much could be done
about that I would think.

I messed up when I posted my radiosity settings before.  The low error factor
should be closer to .3.  My error bound is down to .3 - your .06 seems really
low, which has got to take forever to render.  I'm using a count of 600, and
other than that I have the same settings as you.  The only thing I haven't
toyed with yet is the minimum_reuse.  Have any idea what that controls?

-Mike

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MikeH wrote:
> 
> > global_settings
> > {
> >  ini_option "+QR"
> >  radiosity
> >  {
> >   pretrace_start 0.16 pretrace_end 0.01
> >   count 260 nearest_count 4
> >   error_bound .06 recursion_limit 1
> >   low_error_factor 1 gray_threshold .5
> >   minimum_reuse .015 brightness 1.5
> >   normal on max_sample 1 adc_bailout 0.01/1
> >  }
> > }
> 
> I pretty much got rid of the spotty shadows, so the only remaining problem is
> slight odd lighting near the edges of the patches.  Not much could be done
> about that I would think.
> 
> I messed up when I posted my radiosity settings before.  The low error factor
> should be closer to .3.  My error bound is down to .3 - your .06 seems really
> low, which has got to take forever to render.  I'm using a count of 600, and
> other than that I have the same settings as you.  The only thing I haven't
> toyed with yet is the minimum_reuse.  Have any idea what that controls?

You might want to have a look at the docs (official and otherwise) to
see what the different settings affect; I found them a great help when I
was trying to clone Arnold.

I forget what minimum_reuse does, but it's described in there.

-Xplo

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"Tony[B]" <ben### [at] panamac-comnet> wrote in message
news:39a94eb9@news.povray.org...
> The picture was about the shoes being presented in the center of the
image.
> Then I looked around for some more complex models and decided to stick in
> Nick, my little clay Santa. I just put them together into the image. It's
> not really about anything, just a test of the radiosity. BTW, I've just
> finished an 800x800 version. It took 3hours 10mins and I notice the
shadows
> are still a bit splotchy so I'll bump up the count a bit to see if it
helps
> (it should... :)
>
>

I was trying some extreme examples of mega-radiosity (brightness 10 etc) and
I noticed that rendering the scene at different resolutions yielded very
different results... keep in mind that radiosity won't be consistent if you
change the resolution.

--

Ian

Inkwell: Ian's Homepage
http://www.topcities.com/cartoon/inkwell/index.htm

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"Xplo Eristotle" <inq### [at] unforgettablecom> wrote in message
news:39A99118.4BE9AE96@unforgettable.com...
|
| I forget what minimum_reuse does, but it's described in there.

Yep, it's something to do with sampling space I guess you could call it.  Some kind of
basis for
proximity from one sample to the next which considers the pixel resolution you're
using.  Something
like that.  I've always thought of it as a sample to sample distance factor anyhow. 
That default
is a percentage of the resolution seems to me.  So for a 640 by 480 that might be 9.6
by 7.2 pixels
range.
But like I say, that's my interpretation.  Reading the documentation is one thing,
understanding it
is another.

Bob

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