"Dave Bates [{Norman}]" <dab### [at] msncom> wrote in message
news:3ce66b6f$1@news.povray.org...
>
>     Okay here is my question.. I've played aroudn with this a bit.. I
added
> a "Container" box and see the Cone faintly.. but Is there a way to make it
> more intense without raising the intesity of the light?

Ahh yes, the ever present question about media.

It's a game of adjustment for me. I nearly always put a density {rgb 1}
statement in so I can raise and lower both it and scattering until something
looks okay. However, what most often works is a lower 'extinction' value
than the default (goes into scattering) of one. That way the media brightens
without changing the other parts.
Having read Tim Nikias' reply from this morning, he's certainly right about
the scattering media darkening objects, like a fog does. It isn't always
easy to balance out, hence extinction to the rescue. That thing about
ratio... it's a bit of a refined way to tweak, and doesn't show much change.
See the following, using your scene again with box I added:

media {
    scattering { 1, color rgb .02
         extinction .3 // lower brightens
          }
density {rgb 3} // higher can brighten light
    method 3
    samples 3 // 3 or more to adaptive sample (method 3)
    ratio .9 // default
}

camera {
    location <-4, 3, -5>*3
    look_at .5
}

#declare spot_space=3.1;
#declare max_run=125;

#declare l_rad = 8;
#declare l_x = .25;
#declare l_z = -6;

#while (l_z < max_run)
    light_source {
        <l_x, 5, l_z>
        rgb <1,1,1>
        spotlight
        point_at <l_x, 0, l_z>
        radius l_rad
        falloff l_rad*2
        tightness 25
        media_attenuation on
    }
    #declare l_z = l_z + spot_space;
#end

box {-1,1 scale <30,15,60>
        pigment {rgb <1,0,0>}
        finish {ambient .6 diffuse .6}
        hollow
}

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Bob.. That was, great.. the density was EXACTLY what I was looking for...

I appreciate all the help guys..
:)
D

"bob h" <omn### [at] charternet> wrote in message
news:3ce6778a@news.povray.org...
> "Dave Bates [{Norman}]" <dab### [at] msncom> wrote in message
> news:3ce66b6f$1@news.povray.org...
> >
> >     Okay here is my question.. I've played aroudn with this a bit.. I
> added
> > a "Container" box and see the Cone faintly.. but Is there a way to make
it
> > more intense without raising the intesity of the light?
>
> Ahh yes, the ever present question about media.
>
> It's a game of adjustment for me. I nearly always put a density {rgb 1}
> statement in so I can raise and lower both it and scattering until
something
> looks okay. However, what most often works is a lower 'extinction' value
> than the default (goes into scattering) of one. That way the media
brightens
> without changing the other parts.
> Having read Tim Nikias' reply from this morning, he's certainly right
about
> the scattering media darkening objects, like a fog does. It isn't always
> easy to balance out, hence extinction to the rescue. That thing about
> ratio... it's a bit of a refined way to tweak, and doesn't show much
change.
> See the following, using your scene again with box I added:
>
> media {
>     scattering { 1, color rgb .02
>          extinction .3 // lower brightens
>           }
> density {rgb 3} // higher can brighten light
>     method 3
>     samples 3 // 3 or more to adaptive sample (method 3)
>     ratio .9 // default
> }
>
> camera {
>     location <-4, 3, -5>*3
>     look_at .5
> }
>
> #declare spot_space=3.1;
> #declare max_run=125;
>
> #declare l_rad = 8;
> #declare l_x = .25;
> #declare l_z = -6;
>
> #while (l_z < max_run)
>     light_source {
>         <l_x, 5, l_z>
>         rgb <1,1,1>
>         spotlight
>         point_at <l_x, 0, l_z>
>         radius l_rad
>         falloff l_rad*2
>         tightness 25
>         media_attenuation on
>     }
>     #declare l_z = l_z + spot_space;
> #end
>
> box {-1,1 scale <30,15,60>
>         pigment {rgb <1,0,0>}
>         finish {ambient .6 diffuse .6}
>         hollow
> }
>
>
>

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"Dave Bates [{Norman}]" <dab### [at] msncom> wrote in message
news:3ce69f14@news.povray.org...
> Bob.. That was, great.. the density was EXACTLY what I was looking for...

Good thing, it's not always easy to get those things set up the way you'd
like.

bob h

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Well thatnks for all the help guys.. I got my first real Povray picture
done..

I'm not sure I want to post it.. it's not quite the caliber I see from alot
of the pictures in this NG.. but I might..

Thanks for all the help..
Dave

"Dave Bates" <dab### [at] msncom> wrote in message
news:3ce57c36@news.povray.org...
> Hello All,
>
>   Me again of course..
>
>   I'm doign some testing with Media interaction.. so I made a line of
> Spotlights, using a while statment.
>   Inside the light_source  I have media_attenuation turned on
>   Outside the block, I have atmospheric media create (I think).
>     media {
>         method 3
>         scattering { 1, color rgb .02 }
>     }
>
>     When I render the scene, the only change I see is that it renders
> slower.. I don't see what I expected, which would be a cone of light from
> the spotlight..
>
> Anyone got any suggestions??
>
> Thanks
> Dave
>
>
>

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