Am 09.03.2011 22:57, schrieb Trevor G Quayle:
> "Trevor G Quayle"<Tin### [at] hotmailcom>  wrote:
>> I was doing some tooling about with the latest lighting challenge from 3DRender
>> (http://forums.cgsociety.org/showthread.php?f=185&t=955407) which features a
>> movie theatre.  One of the maon aspects of lighting here will be that coming
>> from the screen.  I first started using radiosity with an image projected on the
>> screen, however it was becoming apparent that it may take some really high
>> quality settings to get good results.  I then though of using an array of area
>> lights created from the projector image. I had already done a lot of the
>> mathwork in my lightdome work, so I did some quick conversions to making a
>> planar version of it with some nice results.
>>
>> In the attached image, the first part is radiosity with some low quality
>> settings.  The second is using the arealight array (16 area lights, 4x4 each).
>>
>> -tgq
>
> Next stage is the projector lighting.  I think this is looking OK.  I don't have
> the screen area light applied, just a single point light to add a little bit of
> additional illumination.  This is the part where I was wondering about the light
> attenuation, realistically speaking, the brightness of the projector in the
> first 1/5 distance is a little too bright (~30%).

Of course you'll want fade_power 2. From my experience, fade_distance 
should be roughly the light source size, so I'd try the equivalent of 35mm.

(I'm presuming assumed_gamma 1.0 here; for other gamma values, you'll 
get nonsense results no matter what you do.)

I think the projector light is too bright in total, though of course it 
all depends on how much dust you want in the air.

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Some adjustments to my scene.  Tweaked the projector lighting a bit to get the
falloff I wanted, added just a touch of fill-type lighting from the projector
beam.  Adjusted the textures a little bit as well, added some specular to the
skin and a fine quilted texture to the seats.  I will probably try a different
seat texture as I don't have it uv mapped so it comes out with some moire-like
artifacting.

-tgq

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Attachments:
Download 'matineescene-3.jpg' (96 KB)

Preview of image 'matineescene-3.jpg'

On Sat, 19 Mar 2011 19:10:15 +0200, Trevor G Quayle  
<Tin### [at] hotmailcom> wrote:

> Some adjustments to my scene.  Tweaked the projector lighting a bit to  
> get the
> falloff I wanted, added just a touch of fill-type lighting from the  
> projector
> beam.  Adjusted the textures a little bit as well, added some specular  
> to the
> skin and a fine quilted texture to the seats.  I will probably try a  
> different
> seat texture as I don't have it uv mapped so it comes out with some  
> moire-like
> artifacting.
>
> -tgq

I like the lighting here.

-- 
-Nekar Xenos-

"The spoon is not real"

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"Trevor G Quayle" <Tin### [at] hotmailcom> schreef in bericht 
news:web.4d84e377f5e1e8f8b05ef170@news.povray.org...
> Some adjustments to my scene.  Tweaked the projector lighting a bit to get 
> the
> falloff I wanted, added just a touch of fill-type lighting from the 
> projector
> beam.  Adjusted the textures a little bit as well, added some specular to 
> the
> skin and a fine quilted texture to the seats.  I will probably try a 
> different
> seat texture as I don't have it uv mapped so it comes out with some 
> moire-like
> artifacting.
>

I don't see anything... Gamma?

Thomas

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Am 20.03.2011 09:04, schrieb Thomas de Groot:

> I don't see anything... Gamma?

Looks more like an absolute brightness issue to me.

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clipka <ano### [at] anonymousorg> wrote:
> Am 20.03.2011 09:04, schrieb Thomas de Groot:
>
> > I don't see anything... Gamma?
>
> Looks more like an absolute brightness issue to me.

I have been having difficulty calibrating my home monitor, so this image was
visible to me at my previous settings.
I have tried to do some calibration, and I think I have my monitor gamma setting
way too high.

I'm going to have to try to figure some of this out, but it is difficult to find
a difinite source to help me get the settings correct.

-tgq

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On 20/03/2011 7:19 PM, Trevor G Quayle wrote:
> clipka<ano### [at] anonymousorg>  wrote:
>> Am 20.03.2011 09:04, schrieb Thomas de Groot:
>>
>>> I don't see anything... Gamma?
>>
>> Looks more like an absolute brightness issue to me.
>
> I have been having difficulty calibrating my home monitor, so this image was
> visible to me at my previous settings.
> I have tried to do some calibration, and I think I have my monitor gamma setting
> way too high.
>
> I'm going to have to try to figure some of this out, but it is difficult to find
> a difinite source to help me get the settings correct.
>
> -tgq
>
To me the front row and projector beam are clearly visible if a bit 
dark. If I adjust the gamma from 1 to 1.1 then the backsplash from the 
projector beam becomes obvious as a circle of light on the back wall.

-- 
Regards
     Stephen

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"Trevor G Quayle" <Tin### [at] hotmailcom> wrote:
> clipka <ano### [at] anonymousorg> wrote:
> > Am 20.03.2011 09:04, schrieb Thomas de Groot:
> >
> > > I don't see anything... Gamma?
> >
> > Looks more like an absolute brightness issue to me.
>
> I have been having difficulty calibrating my home monitor, so this image was
> visible to me at my previous settings.
> I have tried to do some calibration, and I think I have my monitor gamma setting
> way too high.
>
> I'm going to have to try to figure some of this out, but it is difficult to find
> a difinite source to help me get the settings correct.
>
> -tgq

Hopefully this is much better.  I tried to do some calibration with my monitor.

-tgq

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Attachments:
Download 'matineescene-4.jpg' (160 KB)

Preview of image 'matineescene-4.jpg'

"Trevor G Quayle" <Tin### [at] hotmailcom> schreef in bericht 
news:web.4d868898f5e1e8f8b05ef170@news.povray.org...
> Hopefully this is much better.  I tried to do some calibration with my 
> monitor.

Oh yes! This looks *correct* to me. Good work.

Thomas

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> Hopefully this is much better.

   Definitely.

> I tried to do some calibration with my monitor.

It looks you at least calibrated it decently: the lighting level is now
what I would expect for such situation.



-- 
Jaime Vives Piqueres
		
La Persistencia de la Ignorancia
http://www.ignorancia.org

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