Hello,
I'm new to this newsgroup. I'm very interested in learning indoor lighting
and rendering using lights and radiosity. I have been working with POV for
a long, but I can't render images with impressive lighting like these:
http://www.pacificommultimedia.com/architecture.html
http://www.artvps.com/gallery/1/architecture.htm

At the moment, the best image I rendered is this. I think that it is not
very bad, but seems a little dark. If the brightness parameter is
incremented then the image is burn.
Suggestions are well received.
Thanks,

jsr.

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Preview of image 'indoor lighting.jpg'

"JSR" <jsr### [at] gmailcom> wrote in message
news:web.453e38ad89ca60aad8ef73430@news.povray.org...
> Hello,
> I'm new to this newsgroup. I'm very interested in learning indoor lighting
> and rendering using lights and radiosity. I have been working with POV for
> a long, but I can't render images with impressive lighting like these:
> http://www.pacificommultimedia.com/architecture.html
> http://www.artvps.com/gallery/1/architecture.htm
>
> At the moment, the best image I rendered is this. I think that it is not
> very bad, but seems a little dark. If the brightness parameter is
> incremented then the image is burn.
> Suggestions are well received.
> Thanks,
>
> jsr.
>

 the amount of light coming in looks like a slightly overcast day outside.
are the lights just rgb <1, 1, 1>?

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"Ross" <rli### [at] speakeasynet> wrote in message 
news:453e40b1$1@news.povray.org...
> "JSR" <jsr### [at] gmailcom> wrote in message

>> Suggestions are well received.
>> Thanks,
>>
>> jsr.
>>
>
> the amount of light coming in looks like a slightly overcast day outside.

    That's what I was going to say. And yes, if that's the case, then the 
room is lit well imo.

    ~Steve~

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JSR wrote:
> Hello,
> I'm new to this newsgroup. I'm very interested in learning indoor lighting
> and rendering using lights and radiosity. I have been working with POV for
> a long, but I can't render images with impressive lighting like these:
> http://www.pacificommultimedia.com/architecture.html
> http://www.artvps.com/gallery/1/architecture.htm
> 
> At the moment, the best image I rendered is this. I think that it is not
> very bad, but seems a little dark. If the brightness parameter is
> incremented then the image is burn.
> Suggestions are well received.
> Thanks,
> 
> jsr.

Your image looks great! As for the blotchiness of some of the lighting, 
I'd suggest you take a look at a small experiment I made some time ago 
on researching the two-pass-radiosity-technique that was "developed" by 
several members of the newsgroups, my research also went a little into 
photons, using shadowless for the light-objects etc.

As for the images you linked to, I expect some of them make use of 
post-processing or even HDRI techniques, which POV-Ray doesn't natively 
support (yet, I guess, it'll sure be there someday). I often use the 
original image, raise the contrast stupendously, then put a heavy blur 
on it, and finally layer that on top of the original image using 
additive-composition. This softens the image considerably, but depending 
on how much you blur, how much you add it and how much color you retain 
(all subject to tweaking), you get effects close to glaring highlights 
or colored saturation, which IMHO often improve the image, if not overdone.

Regards,
Tim

-- 
aka "Tim Nikias"
Homepage: <http://www.nolights.de>

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Thanks to all for your fast repost,
The color light I use for the image is <0.75, 0.72, 0.53>, it's to say,
yellowish white. The idea was to represent a sunset and I use this color
because it's the recomended by Jeremy Birn in his "color table":
http://www.3drender.com/glossary/colortemp.htm

I think that this image...
http://www.nolights.de/stills/gallery/images/prep4company.jpg
..... is very beautiful and lighting is very realistic, I would like to see
the source pov code of this image in order to have an idea of what was
wrong in my image, comparing the materials, lights, radiosity,...

JSR

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JSR nous apporta ses lumieres en ce 24/10/2006 17:37:
> Thanks to all for your fast repost,
> The color light I use for the image is <0.75, 0.72, 0.53>, it's to say,
> yellowish white. The idea was to represent a sunset and I use this color
> because it's the recomended by Jeremy Birn in his "color table":
> http://www.3drender.com/glossary/colortemp.htm
> 
> I think that this image...
> http://www.nolights.de/stills/gallery/images/prep4company.jpg
> ..... is very beautiful and lighting is very realistic, I would like to see
> the source pov code of this image in order to have an idea of what was
> wrong in my image, comparing the materials, lights, radiosity,...
> 
> JSR
> 
Your "sun" may not be bright enough. Try multiplying it's value by something 
around 1.5 to 2. This won't change the colour.
The shadow of the window looks to sharp, I'd use an area_light.

-- 
Alain
-------------------------------------------------
Disc space -- the final frontier!

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"JSR" <jsr### [at] gmailcom> wrote:
> Hello,
> I'm new to this newsgroup. I'm very interested in learning indoor lighting
> and rendering using lights and radiosity. I have been working with POV for
> a long, but I can't render images with impressive lighting like these:
> http://www.pacificommultimedia.com/architecture.html
> http://www.artvps.com/gallery/1/architecture.htm
>
> At the moment, the best image I rendered is this. I think that it is not
> very bad, but seems a little dark. If the brightness parameter is
> incremented then the image is burn.
> Suggestions are well received.
> Thanks,
>
> jsr.

I have to say I like your image a lot, but perhaps you didn't want light
from an overcast day?

I don't have any direct experience, but some of my favorite POV interiors
are by Jaime Vives Piqueres, like the ones here:
http://www.ignorancia.org/en/index.php?page=Modern_interior
Especially this one:
http://www.ignorancia.org/uploads/images/modern_interior/wips/interior2-060819-1.jpg

I think Jaime manages to get bright daylight without the image blooming and
losing color definition. My (limited) understanding is that for the lights
in some images he uses several sources: large area_lights on each
window/outside door, to simulate the diffuse light from the sky and
environment, and one brighter light at the sun-position for the actual
sunshadows. This gives better results than the pure sunlight+radiosity that
is perhaps closer to reality, IMO. Of course he also gets good fading
distance and light values from his LightsysIV light simulation system.

(If any of this is wrong, sorry, some is just speculation.)

Good luck- you have a nice interior to experiment with!

-Stefan Sittler

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Alain wrote:
> JSR nous apporta ses lumieres en ce 24/10/2006 17:37:
>> Thanks to all for your fast repost,
>> The color light I use for the image is <0.75, 0.72, 0.53>, it's to
>> say, yellowish white. The idea was to represent a sunset and I use
>> this color because it's the recomended by Jeremy Birn in his "color
>> table": http://www.3drender.com/glossary/colortemp.htm
>>
>> I think that this image...
>> http://www.nolights.de/stills/gallery/images/prep4company.jpg
>> ..... is very beautiful and lighting is very realistic, I would like
>> to see the source pov code of this image in order to have an idea of
>> what was wrong in my image, comparing the materials, lights,
>> radiosity,... JSR
>>
> Your "sun" may not be bright enough. Try multiplying it's value by
> something around 1.5 to 2. This won't change the colour.
> The shadow of the window looks to sharp, I'd use an area_light.

Indeed, I found the key is to get the ratio of brightness between the sun 
light and the sky colour correct.  You can look at photos of similar scenes 
to make an estimate.  Make sure your gamma settings are correct.  If you 
want your indoor scene to be well exposed then both the sun and sky colour 
will likely need to be above <1,1,1>.

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"JSR" <jsr### [at] gmailcom> wrote:
> Thanks to all for your fast repost,
> The color light I use for the image is <0.75, 0.72, 0.53>, it's to say,
> yellowish white. The idea was to represent a sunset and I use this color
> because it's the recomended by Jeremy Birn in his "color table":
> http://www.3drender.com/glossary/colortemp.htm
>
> I think that this image...
> http://www.nolights.de/stills/gallery/images/prep4company.jpg
> ..... is very beautiful and lighting is very realistic, I would like to see
> the source pov code of this image in order to have an idea of what was
> wrong in my image, comparing the materials, lights, radiosity,...
>
> JSR

Sure, I'm at the university right now, but when I get back home, I'll see
what I can do. The chair and sofa are big meshes though, so I guess I'd
have to take those out of the scene-file and replace them with something
simpler (low-res, probably), but you'll get the materials and lighting.

Regards,
Tim

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Smws wrote:
  > I have to say I like your image a lot,

   Me too! I think JSR managed to get a very good lighting here (apart 
from a very nice room and furniture), but some more intensity on the 
sunlight will help further.

> I think Jaime manages to get bright daylight without the image blooming and
> losing color definition. My (limited) understanding is that for the lights
> in some images he uses several sources: large area_lights on each
> window/outside door, to simulate the diffuse light from the sky and
> environment, and one brighter light at the sun-position for the actual
> sunshadows. This gives better results than the pure sunlight+radiosity that
> is perhaps closer to reality, IMO. Of course he also gets good fading
> distance and light values from his LightsysIV light simulation system.

   Actually, this images uses another alternative to the "realistic" 
sunlight+rad approach: ambient boxes in place of the window glasses, 
with coloring dependent on the sky color from skylight.inc. So it's 
still sunlight+rad, but helped a bit with these emitting surfaces and a 
recursion level of 2. When using two-pass rad, you can put back the real 
glass for the final render.

> (If any of this is wrong, sorry, some is just speculation.)

   No, you are right: I really used area lights on the first images... 
but it was too slow for my patience.

--
Jaime

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