This is a bonsai scene I have been playing with on and off for a while.  I'd
like to add some media to create a slightly dusty/hazy look that would
highlight the light beams a little and maybe give the image a little extra
something.  Any advice on how to create a media that would do that would be
appreciated.

Patrick Dugan

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Attachments:
Download 'Bonsai.jpg' (96 KB)

Preview of image 'Bonsai.jpg'

> This is a bonsai scene I have been playing with on and off for a while.
I'd
> like to add some media to create a slightly dusty/hazy look that would
> highlight the light beams a little and maybe give the image a little extra
> something.  Any advice on how to create a media that would do that would
be
> appreciated.

Since you're using an area light, and area lights + media are a bad idea
when avoidable, I'd suggest this approach:

1. Put the entire scene you have right now (excluding the camera) into a
light_group.

2. Inside a separate light_group, create a plane whose surface coincides
with the backside of the bamboo wall. Make sure the tree and camera are
*inside* this plane. Make the plane hollow and transparent and give it an
interior something like

interior {
media {
scattering {2, .01}
// experiment with different scattering types (like type 1, or type 5 with
different eccentricity values)
// if the media is too heavy, lower the .01; if its too invisible, bring the
.01 up higher.
// if there's simply too much darkness for the lighting effects that are
created, then add "extinction .5" and fiddle with the .5 until it looks
good.
}
}

3. Put a light source identical to your area light inside this light_group,
but *don't make it an area light*. That way, the solid objects in the scene
will be lit with an area light, but the media will be lit with a point
light. This will speed up the render a *lot* and the difference probably
won't be noticeable.

 - Slime
[ http://www.slimeland.com/ ]

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In article <3dcb12c3@news.povray.org>,
 "Patrick Dugan" <pat### [at] netinsnet> wrote:

> This is a bonsai scene I have been playing with on and off for a while.  I'd
> like to add some media to create a slightly dusty/hazy look that would
> highlight the light beams a little and maybe give the image a little extra
> something.  Any advice on how to create a media that would do that would be
> appreciated.

Nice...the bark and leaves look too brightly lit though, do they have a 
high ambient?
Anyway, what you want is scattering media, without a density pattern, 
and with a very dim scattering color. Type 4 (Rayleigh) scattering is 
probably the best for this. If it is invisible, boost the scattering 
amount, if everything is black or white, lower it.

-- 
Christopher James Huff <cja### [at] earthlinknet>
http://home.earthlink.net/~cjameshuff/
POV-Ray TAG: chr### [at] tagpovrayorg
http://tag.povray.org/

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>
> This is a bonsai scene I have been playing with on and off for a while.
I'd
> like to add some media to create a slightly dusty/hazy look that would
> highlight the light beams a little and maybe give the image a little extra
> something.  Any advice on how to create a media that would do that would
be
> appreciated.

I have no advice to give (haven't played with scattering media)
but I wanted to say I like your bonsai a lot.
How it was made?.

Txemi Jendrix
http://www.txemijendrix.com

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Thank you!  The tree was created using Gilles Tran wonderful tree macro.
The rest was modeled within Povray by hand.  The bamboo was made using SOR
objects.

"Txemi Jendrix" <tji### [at] euskalnetnet> wrote in message
news:3dcb263e@news.povray.org...

3dcb12c3@news.povray.org...
> >
> > This is a bonsai scene I have been playing with on and off for a while.
> I'd
> > like to add some media to create a slightly dusty/hazy look that would
> > highlight the light beams a little and maybe give the image a little
extra
> > something.  Any advice on how to create a media that would do that would
> be
> > appreciated.
>
> I have no advice to give (haven't played with scattering media)
> but I wanted to say I like your bonsai a lot.
> How it was made?.
>
> Txemi Jendrix
> http://www.txemijendrix.com
>
>
>

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Okay, I'll show my stupidity here.  If I use a plane that is parallel to the
back wall won't it be flat?  How can the
tree and camera be inside it?  I could see a box since it would "fill" the
scene but I don't understand using a plane.

"Slime" <slm### [at] slimelandcom> wrote in message
news:3dcb1fc6$1@news.povray.org...
> > This is a bonsai scene I have been playing with on and off for a while.
> I'd
> > like to add some media to create a slightly dusty/hazy look that would
> > highlight the light beams a little and maybe give the image a little
extra
> > something.  Any advice on how to create a media that would do that would
> be
> > appreciated.
>
> Since you're using an area light, and area lights + media are a bad idea
> when avoidable, I'd suggest this approach:
>
> 1. Put the entire scene you have right now (excluding the camera) into a
> light_group.
>
> 2. Inside a separate light_group, create a plane whose surface coincides
> with the backside of the bamboo wall. Make sure the tree and camera are
> *inside* this plane. Make the plane hollow and transparent and give it an
> interior something like
>
> interior {
> media {
> scattering {2, .01}
> // experiment with different scattering types (like type 1, or type 5 with
> different eccentricity values)
> // if the media is too heavy, lower the .01; if its too invisible, bring
the
> .01 up higher.
> // if there's simply too much darkness for the lighting effects that are
> created, then add "extinction .5" and fiddle with the .5 until it looks
> good.
> }
> }
>
> 3. Put a light source identical to your area light inside this
light_group,
> but *don't make it an area light*. That way, the solid objects in the
scene
> will be lit with an area light, but the media will be lit with a point
> light. This will speed up the render a *lot* and the difference probably
> won't be noticeable.
>
>  - Slime
> [ http://www.slimeland.com/ ]
>
>

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> Thank you!  The tree was created using Gilles Tran wonderful tree macro.
> The rest was modeled within Povray by hand.  The bamboo was made using SOR
> objects.

I wanted to update an image I made back in 1999, and I
think your bonsai has given me the final push.
Again, great image. Waiting to see the media version.
Bye

PS: Just if you are curious, this is the old image:
http://www.txemijendrix.com/imagpov/povpage/1.html


Txemi Jendrix
http://www.txemijendrix.com

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> Okay, I'll show my stupidity here.  If I use a plane that is parallel to
the
> back wall won't it be flat?  How can the
> tree and camera be inside it?  I could see a box since it would "fill" the
> scene but I don't understand using a plane.

I think he means you'll have to create a plane and rotate it
so the +y axis of the plane points to the tree and camera.
Bye

Txemi Jendrix
http://www.txemijendrix.com

Post a reply to this message

> Okay, I'll show my stupidity here.  If I use a plane that is parallel to
the
> back wall won't it be flat?  How can the
> tree and camera be inside it?  I could see a box since it would "fill" the
> scene but I don't understand using a plane.


Planes have insides and outsides just like boxes or spheres. The
"underneath" part of a plane is considered to be "inside" it. So just make
sure the normal of the plane points *away* from the camera, so that the
camera is "underneath" it.

 - Slime
[ http://www.slimeland.com/ ]

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On Thu, 7 Nov 2002 19:25:26 -0600, "Patrick Dugan"
<pat### [at] netinsnet> wrote:

>This is a bonsai scene I have been playing with on and off for a while.  I'd
>like to add some media to create a slightly dusty/hazy look that would
>highlight the light beams a little and maybe give the image a little extra
>something.  Any advice on how to create a media that would do that would be
>appreciated.

Impressive! I can't wait to see it with media.

My only nit to pick is that the whole bonsai - even the leaves - seems
luxophobic. Shouldn't at least the leaves make some effort to point to
the light, instead of away from it?


Peter Popov ICQ : 15002700
Personal e-mail : pet### [at] vipbg
TAG      e-mail : pet### [at] tagpovrayorg

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