In article <gfp8ctg1qffjln61frtschfo6r2sublis5@4ax.com>, 
dav### [at] blueyondercouk says...
> Any chance of an animation taking us on a tour of this display area?

Would take a BIT too long to render...and wouldn't be very interesting in 
its current state (the room behind the bend is very much empty) ;-)

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In article <3AC3AC1F.7B89E128@gmx.de>, chr### [at] gmxde says...
> Not necessarily if you thereby avoid a lot of additional light sources.  I
> would definitely try it.
Ok, i'll try it.
Somebody has good rad. settings? I havn't done anything with MegaPovs 
radiosity yet.

Lutz-Peter

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Lutz-Peter Hooge wrote:

> Somebody has good rad. settings? I havn't done anything with MegaPovs
> radiosity yet.

Below is what I use for most of my radiosity images.
Use HQOn=0 for tests (fast), HQOn=1 for final render and HQOn=2 if you really
have some trouble with radiosity artefacts (may not be enough though).
Turn all "ambient" to 0 and all "diffuse" to 1 for regular objects. You may have
to tweak the light intensities, color intensities, light color and sky color to
get proper effects.

G.

#declare HQOn=1;
#declare QR=1;

global_settings{
        assumed_gamma 1
        max_trace_level 15
        #if (QR=1)
            ini_option "+QR"
        #end
        radiosity{
            pretrace_start 1
            pretrace_end   1
            #switch (HQOn)
                #case (0)
                    count 100 error_bound 1
                #break
                #case (1)
                    count 800 error_bound 0.02
                #break
                #case (2)
                    count 1600 error_bound 0.02
                #break
            #end
            nearest_count 4
            recursion_limit 1
            low_error_factor 1
            gray_threshold 0
            minimum_reuse 0.015
            brightness 2
            adc_bailout 0.01/2
            normal on
        }
}

--

**********************
http://www.oyonale.com
**********************
Graphic experiments
Pov-ray gallery

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Gilles Tran wrote:
> 
> 
> Below is what I use for most of my radiosity images.
> [...]
>             brightness 2

Are you sure about that?

brightness 1 is a fairly universal value that should be realistic in most
cases.  If you change an existing scene for using radiosity, it's often
even useful to use lower values.  

Christoph

-- 
Christoph Hormann <chr### [at] gmxde>
IsoWood include, radiosity tutorial, TransSkin and other 
things on: http://www.schunter.etc.tu-bs.de/~chris/

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In the room WIP I posted a while ago which only has one window I have to use
a brightness of above 3 to be able to see anything except blackness, it all
depends on how much of the scene is actually lit by direct light. I
regularly use a brightness of about 2 though.

Kev
--
http://perso.libertysurf.co.uk/kevin.ellis

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In article <3AC4B8D0.47B58239@gmx.de>, chr### [at] gmxde says...
> brightness 1 is a fairly universal value that should be realistic in most
> cases.  If you change an existing scene for using radiosity, it's often
> even useful to use lower values.  
I had to set it so 0.3, at 1 everything is white... maybe because I use 
colors > rgb 1.
But theres another problem: 0 PPS even with HQOn=0 :-(
Only if I switch EVERYTHING off (reflections, isosurfaces, arealights 
etc), I can get a preview.

Lutz-Peter

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Christoph Hormann wrote:

> >             brightness 2
>
> Are you sure about that?
> brightness 1 is a fairly universal value that should be realistic in most
> cases.  If you change an existing scene for using radiosity, it's often
> even useful to use lower values.

Well, it happens that I use brightness 2 in scenes where I have direct
photographic references (I just cut and pasted the settings here), so the
choice is only dictated by the similarity between the "real" scene and its
rendered version (I'm not talking about the Cornell box here, but of complex,
real-life pictures). These images also require extremely bright lights.
But you're right,  brightness level depends on the scene. My "Contrast" image
used 1.2 for instance (but it was not based upon a photography). I don't
remember using values lower than 1. It's more an aesthetic choice than a
technical one IMHO.

G.

--

**********************
http://www.oyonale.com
**********************
Graphic experiments
Pov-ray gallery

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Kevin Ellis wrote:
> 
> In the room WIP I posted a while ago which only has one window I have to use
> a brightness of above 3 to be able to see anything except blackness, it all
> depends on how much of the scene is actually lit by direct light. I
> regularly use a brightness of about 2 though.
> 

It's usually better to increase the ambient finish of the light emitting
objects than to increase brightness.  While the fist only brings more
light in the scene, the brightness parameter strongly influences the
colors of the scene in an often unrealistic way.  

Christoph

-- 
Christoph Hormann <chr### [at] gmxde>
IsoWood include, radiosity tutorial, TransSkin and other 
things on: http://www.schunter.etc.tu-bs.de/~chris/

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Lutz-Peter Hooge wrote:
> 
> I had to set it so 0.3, at 1 everything is white... maybe because I use
> colors > rgb 1.

As Gilles said, all finishes need to be changed, if you want to avoid
adapting the colors, you can try to play with the diffuse finish
component. 

> But theres another problem: 0 PPS even with HQOn=0 :-(
> Only if I switch EVERYTHING off (reflections, isosurfaces, arealights
> etc), I can get a preview.
> 

Be sure to turn off all additional light sources (just leave the sun
light).  Of course reflections and isosurfaces slow down things too, but
at least the pretrace should run with 'visible speed'.

Christoph

-- 
Christoph Hormann <chr### [at] gmxde>
IsoWood include, radiosity tutorial, TransSkin and other 
things on: http://www.schunter.etc.tu-bs.de/~chris/

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Lutz-Peter Hooge wrote:

> In article <3AC4B8D0.47B58239@gmx.de>, chr### [at] gmxde says...
> > brightness 1 is a fairly universal value that should be realistic in most
> > cases.  If you change an existing scene for using radiosity, it's often
> > even useful to use lower values.
> I had to set it so 0.3, at 1 everything is white... maybe because I use
> colors > rgb 1.
> But theres another problem: 0 PPS even with HQOn=0 :-(
> Only if I switch EVERYTHING off (reflections, isosurfaces, arealights
> etc), I can get a preview.

Strange. I use HQOn=0 on my old, slow Pentium 133. Note that scenes that use
these settings :
- have only one light source
- all objects have ambient = 0
- have few reflections
- have few (or none !) objects with ior
- colors are normal (below rgb 1)

I hope this helps, but as I design images around radiosity, I can't say that
these settings are universal.

G.
--

**********************
http://www.oyonale.com
**********************
Graphic experiments
Pov-ray gallery

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