Ok ... now, that I got the model, I can try a bit on
the lighting.
I still have the problem, setting upt the lightsource,
to fit the lighting to the original[1], even without
the object. I played with fade-power, fade-distance,
lightness Rad.-settings and what not... I can't get
the near left wall and the floor be as bright as in the
original and still have the dark corner in the upper
background and the "light-blooming" of the floor from the
left. Interestingly, the most similar resulst I got with
fade-power=0.5 -- (Does that make sense, what I'm writing?)
Now, after having a quite satisfying lightsource, I was about
to tweak the radiosity params, but this is even harder...
I have big problems, with the time of 8m6sec to get the
rendered image (even without Focal blur).

But I still believe, this is my fault, and more advanced users
are probably able to do better. What does our lighting-expert[2]
say, what he whould advice ? Of course, I also like input from
others ;)

Jan ...


[1]
http://www.trinisica.com/img/gallery/imageviewer.asp?image=brazil/b02x_athene_01.jpg&w=480&h=601

[2] Kari, I mean you ... ;)

Post a reply to this message

Attachments:
Download 'athene.jpg' (13 KB)

Preview of image 'athene.jpg'

I don't want to sound like a rube who doesn't know whats going on around
him, but what is the reference to "Brazil" all about.
H²

Post a reply to this message

Halbert wrote:

> I don't want to sound like a rube who doesn't know whats going on around
> him, but what is the reference to "Brazil" all about.
> H²


It's a MAX plug-in that does radiosity.

-- 
/*Francois Labreque*/#local a=x+y;#local b=x+a;#local c=a+b;#macro P(F//
/*    flabreque    */L)polygon{5,F,F+z,L+z,L,F pigment{rgb 9}}#end union
/*        @        */{P(0,a)P(a,b)P(b,c)P(2*a,2*b)P(2*b,b+c)P(b+c,<2,3>)
/*   videotron.ca  */}camera{location<6,1.25,-6>look_at a orthographic}

Post a reply to this message

"Jan Walzer" <jan### [at] lzernet> wrote in message news:3ccc679a@news.povray.org...
> Ok ... now, that I got the model, I can try a bit on
> the lighting.
> I still have the problem, setting upt the lightsource,
> to fit the lighting to the original[1], even without
> the object. I played with fade-power, fade-distance,
> lightness Rad.-settings and what not... I can't get


<snip>

Where are you placing your light? In the original, it looks as though the light
is aiming at the right back wall, with all the light falling on the left hand
side of the image coming from diffusion. In your version, it looks as though
your light is lighting the statue and problematic areas more directly.

Post a reply to this message

"Tom Melly" <tom### [at] tomandlucouk> wrote :
> Where are you placing your light? In the original, it looks as though the light
> is aiming at the right back wall, with all the light falling on the left hand
> side of the image coming from diffusion. In your version, it looks as though
> your light is lighting the statue and problematic areas more directly.

Now as I look again on the image, I see, what you probably mean ...

I'm sure, I have the lightsource nearly at the same position as
in the original image. You can see that, if you compare the direct
shadows of the corner and of the statue.
All others are effects of light-parameters, ie. brightness, fade-power
and fade-distance. I think this one here was done with f-pow=2, but I
will again give it a try with some "unnatural" values ...

Post a reply to this message

"Jan Walzer" <jan### [at] lzernet> wrote in message news:3ccd6f4e@news.povray.org...
>
> "Tom Melly" <tom### [at] tomandlucouk> wrote :
> > Where are you placing your light? In the original, it looks as though the
light
> > is aiming at the right back wall, with all the light falling on the left
hand
> > side of the image coming from diffusion. In your version, it looks as though
> > your light is lighting the statue and problematic areas more directly.
>
> Now as I look again on the image, I see, what you probably mean ...
>
> I'm sure, I have the lightsource nearly at the same position as
> in the original image. You can see that, if you compare the direct
> shadows of the corner and of the statue.

It's certainly tricky to work out what they've done with the light. It says
"pointlight", but the shape looks more like a spotlight. Perhaps it's coming
through an apeture.

Nevertheless, I would try and emulate the round shape of the direct light
illumination (as seen on the back wall and the ceiling), and then go from there.

Post a reply to this message

"Tom Melly" <tom### [at] tomandlucouk> wrote :
> It's certainly tricky to work out what they've done with the light. It says
> "pointlight", but the shape looks more like a spotlight.
                                                ^^^^^^^^^

interesting, why do you think, it's a spotlight?
I see currently no argument to state that ... I'm interested
in the details, why you think it is one ...

Post a reply to this message

"Jan Walzer" <jan### [at] lzernet> wrote in message news:3ccd735e@news.povray.org...
> "Tom Melly" <tom### [at] tomandlucouk> wrote :
> > It's certainly tricky to work out what they've done with the light. It says
> > "pointlight", but the shape looks more like a spotlight.
>                                                 ^^^^^^^^^
>
> interesting, why do you think, it's a spotlight?
> I see currently no argument to state that ... I'm interested
> in the details, why you think it is one ...
>

If you look at the back wall and the ceiling, it seems round with a defined
edge? Ignore the light falling on the statue, and just look at the brightest
light on the back wall/ceiling.

Of course, the same effect could be achieved by placing the pointlight on the
other side of a round window.

Post a reply to this message

"Tom Melly" <tom### [at] tomandlucouk> wrote :
> > > It's certainly tricky to work out what they've done with the light. It says
> > > "pointlight", but the shape looks more like a spotlight.
> >                                                 ^^^^^^^^^
> >
> > interesting, why do you think, it's a spotlight?

> If you look at the back wall and the ceiling, it seems round with a defined
> edge? Ignore the light falling on the statue, and just look at the brightest
> light on the back wall/ceiling.
>
> Of course, the same effect could be achieved by placing the pointlight on the
> other side of a round window.

I don't think, this is the shape of a spotlight, what you mean.
I also see this, but this can be achieved by the use of normal
pointlights.

BTW: here's my recent (fast) try ...

Post a reply to this message

Attachments:
Download 'athene.jpg' (16 KB)

Preview of image 'athene.jpg'

"Tom Melly" <tom### [at] tomandlucouk> wrote :
> If you look at the back wall and the ceiling, it seems round with a defined
> edge? Ignore the light falling on the statue, and just look at the brightest
> light on the back wall/ceiling.

I can create this shape of the light quite good ...

it's a pity, that the rest of the room doesn't nearly look
as I want it to ...

Post a reply to this message

Attachments:
Download 'athene_room.jpg' (10 KB)

Preview of image 'athene_room.jpg'

"Jan Walzer" <jan### [at] lzernet> wrote in message
news:3ccd8168@news.povray.org...
>
> I can create this shape of the light quite good ...
>
> it's a pity, that the rest of the room doesn't nearly look
> as I want it to ...
>

Ah - of course, I'd forgotten about the fade power. I'd still be tempted to
try putting the light around the corner so that only diffuse lighting hits
the statue... (assuming you haven't already done that).

Post a reply to this message

"Tom Melly" <tom### [at] tomandlucouk> wrote :
> Ah - of course, I'd forgotten about the fade power. I'd still be tempted to
> try putting the light around the corner so that only diffuse lighting hits
> the statue... (assuming you haven't already done that).

nope, I've not done that, but you can see in the orig, that
the statue and big parts of the floor are directly illuminated
by the lightsource, because there's one sharp shadow for each
object. I don't believe, that brazil is that good, that it can
produce such sharp shadows with such a rendertime ...

Post a reply to this message

"Jan Walzer" <jan### [at] lzernet> wrote in message
news:3ccd84c8@news.povray.org...
>
> nope, I've not done that, but you can see in the orig, that
> the statue and big parts of the floor are directly illuminated
> by the lightsource, because there's one sharp shadow for each
> object. I don't believe, that brazil is that good, that it can
> produce such sharp shadows with such a rendertime ...
>

Yep - the thought had occured. I even wondered if the sharp shadows might be
an indication of a brazil weakness - sharp shadows from such a diffuse light
should be a no-no.

Well, if it's not diffuse lighting, then it looks like a really high, weird,
fade-power.

Post a reply to this message

Tom Melly wrote:
> 
> "Jan Walzer" <jan### [at] lzernet> wrote in message news:3ccd735e@news.povray.org...
> > "Tom Melly" <tom### [at] tomandlucouk> wrote :
> > > It's certainly tricky to work out what they've done with the light. It says
> > > "pointlight", but the shape looks more like a spotlight.
> >                                                 ^^^^^^^^^
> >
> > interesting, why do you think, it's a spotlight?
> > I see currently no argument to state that ... I'm interested
> > in the details, why you think it is one ...
> >
> 
> If you look at the back wall and the ceiling, it seems round with a defined
> edge? Ignore the light falling on the statue, and just look at the brightest
> light on the back wall/ceiling.
> 
> Of course, the same effect could be achieved by placing the pointlight on the
> other side of a round window.

In POV-Ray, even a spotlight is technically a point light of sorts; the
light emanates from a single point, not from a diffuse surface or array
of points or something like that. Instead of trying to figure out how to
emulate the Brazil lighting with a plain vanilla light (which will, as
pointed out, put way too much light on the statue) why not just use a
spotlight to begin with?

-Xplo

Post a reply to this message

Could you please let me know where I can get that beautiful Athene model?

Thanks!
George Pantazopoulos


"Jan Walzer" <jan### [at] lzernet> wrote in message
news:3ccc679a@news.povray.org...
> Ok ... now, that I got the model, I can try a bit on
> the lighting.
> I still have the problem, setting upt the lightsource,
> to fit the lighting to the original[1], even without
> the object. I played with fade-power, fade-distance,
> lightness Rad.-settings and what not... I can't get
> the near left wall and the floor be as bright as in the
> original and still have the dark corner in the upper
> background and the "light-blooming" of the floor from the
> left. Interestingly, the most similar resulst I got with
> fade-power=0.5 -- (Does that make sense, what I'm writing?)
> Now, after having a quite satisfying lightsource, I was about
> to tweak the radiosity params, but this is even harder...
> I have big problems, with the time of 8m6sec to get the
> rendered image (even without Focal blur).
>
> But I still believe, this is my fault, and more advanced users
> are probably able to do better. What does our lighting-expert[2]
> say, what he whould advice ? Of course, I also like input from
> others ;)
>
> Jan ...
>
>
> [1]
http://www.trinisica.com/img/gallery/imageviewer.asp?image=brazil/b02x_athen
e_01.jpg&w=480&h=601
>
> [2] Kari, I mean you ... ;)
>
>
>

Post a reply to this message

> Could you please let me know where I can get that beautiful Athene model?
I believe here: http://www.3dup.com/highmodels/1024/0001.html

cu!
--
camera{location-z*3}#macro G(b,e)b+(e-b)*(C/50)#end#macro L(b,e,k,l)#local C=0
;#while(C<50)sphere{G(b,e),.1pigment{rgb G(k,l)}finish{ambient 1}}#local C=C+1
;#end#end L(y-x,y,x,x+y)L(y,-x-y,x+y,y)L(-x-y,-y,y,y+z)L(-y,y,y+z,x+y)L(0,x+y,
<.5,1,.5>,x)L(0,x-y,<.5,1,.5>,x)               // ZK http://www.povplace.be.tf

Post a reply to this message