> I understand the basic idea of radiosity, and I think it would help some
> of my scenes. But I'm confused by all this distance-error-reuse stuff,
> and the documentation had me lost back at the word apple. Can someone
> give me, or point me too, a good comprehensive explanation of all these
> parameters? I need a sort of "Radiosity for Dummies"...

I only know of this one, which is pretty good IMO:

http://www.students.tut.fi/~warp/pics/Radiosity_test2/

The most info is under the comments link.

-Mike

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this is neither comprehensive, nor an explanation, but 
might help you anyway (see "useful radiosity settings"):

http://www.student.hig.se/~kp97gbc/povpage/phtpage/index.html

	y.

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Tomas Plachetka <pla### [at] uni-paderbornde> wrote:
: http://www.student.hig.se/~kp97gbc/povpage/phtpage/index.html

  The best settings seem to be user and scene dependant. For example, he
says:

"1. Adaptive sampling method is pretty inacurate and doesn't seem to speed
up tracing , it even happened that it slowed down it , while producing
unwanted artifacts in a picture, so keep DISTANCE_MAXIMUM at 0."

  I used distance maximum 1 in my test images and they look quite good.
Lowering it to less than 1 slows down the rendering.

"2. Higher COUNT than 200 doesn't produce much better results, but it slows
down raytracing. Keep it round 150 if not doing scenes with lots of small
objects that are emitting light."

  Well, with the images in my "radiosity test 2"-page using a count of
150 makes them quite awful.

-- 
main(i,_){for(_?--i,main(i+2,"FhhQHFIJD|FQTITFN]zRFHhhTBFHhhTBFysdB"[i]
):5;i&&_>1;printf("%s",_-70?_&1?"[]":" ":(_=0,"\n")),_/=2);} /*- Warp -*/

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The only tip I can give you is to make the scale of your scenes really
large. Don't do like me and contain the entire radiosity scene in a 1,-1
box, use a 10,-10 or larger box.

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Nieminen Juha wrote:
> 
> Tomas Plachetka <pla### [at] uni-paderbornde> wrote:
> : http://www.student.hig.se/~kp97gbc/povpage/phtpage/index.html
> 
>   The best settings seem to be user and scene dependant. For example, he
> says:

<snip>

sure, it's alchemy. therefore i like that the guy 
offers also at least one reference scene on which 
everybody can sharpen their teeth. 

	y.

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TonyB <ben### [at] panamaphoenixnet> wrote:
: The only tip I can give you is to make the scale of your scenes really
: large.

  That's certainly not a good idea. Read:
http://iki.fi/warp/pics/Radiosity_test2/comments.html

-- 
main(i,_){for(_?--i,main(i+2,"FhhQHFIJD|FQTITFN]zRFHhhTBFHhhTBFysdB"[i]
):5;i&&_>1;printf("%s",_-70?_&1?"[]":" ":(_=0,"\n")),_/=2);} /*- Warp -*/

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I didn't mean really-really large. Besides, as you noticed, I added that a
10,-10 box should do it.

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Thanks for the help.
What I really wanted was sort of a way to determine the best values before
rendering, but it seems I'll have to just guess and check on some things
:-(. I'm too impatient to wait three days for a render, and this is sort of
a "family" computer, so I'd better not tie it up that long anyway. I did get
at least some useful tips from the links, though. Unfortunately they were
mostly "wait longer for better image" :-)

Larry Fontaine wrote:

> I understand the basic idea of radiosity, and I think it would help some
> of my scenes. But I'm confused by all this distance-error-reuse stuff,
> and the documentation had me lost back at the word apple. Can someone
> give me, or point me too, a good comprehensive explanation of all these
> parameters? I need a sort of "Radiosity for Dummies"...

Post a reply to this message

PS. I put radiosity in "trapped" and it's been rendering for 7:30:00 now and is
at only 35%. It better turn out right... (mumble mumble grumble)

Larry Fontaine wrote:

> Thanks for the help.
> What I really wanted was sort of a way to determine the best values before
> rendering, but it seems I'll have to just guess and check on some things
> :-(. I'm too impatient to wait three days for a render, and this is sort of
> a "family" computer, so I'd better not tie it up that long anyway. I did get
> at least some useful tips from the links, though. Unfortunately they were
> mostly "wait longer for better image" :-)
>
> Larry Fontaine wrote:
>
> > I understand the basic idea of radiosity, and I think it would help some
> > of my scenes. But I'm confused by all this distance-error-reuse stuff,
> > and the documentation had me lost back at the word apple. Can someone
> > give me, or point me too, a good comprehensive explanation of all these
> > parameters? I need a sort of "Radiosity for Dummies"...

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On Sun, 11 Jun 2000 16:57:39 -0400, "Magesitting"
<magesitting@(nospam)home.com> wrote:

>Hello,
>            I have been playing around with POV for a while now. I have
>gotten the basics down and now I am working on radiosity. I am not having
>much luck.
>    I have a simple scene that I want to render, but every time I use
>radiosity I get these funny light artifacts.
>    Can any one give me some help.
>    I have attached the files to my scene.
>    I use Moray and Spatch as modellers.
>    Thank you in advance.

Magesitting,

first and foremost, please, please take the time to subscribe to the
group povray.announce.frequently-asked-questions and read the (very
few) posts there. Pay special attention to the posting guidelines and
the welcome message to new users.

Second, please cancel both your posts in this group as this is not a
binaries group and some people are reading it with text-based
newsreaders. Please re-post in the appropriate group after you've done
that.

Thanks for your cooperation in keeping this server organised.


Peter Popov ICQ : 15002700
Personal e-mail : pet### [at] usanet
TAG      e-mail : pet### [at] tagpovrayorg

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