"Sebastian H." <seb### [at] webde> wrote in message
news:3d81caab@news.povray.org...
>
> Looks good, but Sir Charles may be right with the CSG bulb thing.
>

Yes, I know. I just did the csg bulb for this render. I will make a better
one...

> The lamps in our cellar look very simillar, but they have two parallel
> vertical "glass holders" (ok, actually our one's are made of plastics
 ;-) )

I discussed this with a friend and he said that there are two also. I will
change this.

/ Daniel Nilsson

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"Martin Magnusson" <mam### [at] studentuuse> wrote in message
news:3D81A2F1.66E31F2D@student.uu.se...
> The wood is fine, IMO, but I think the glass should be less transparent.
> Maybe some sort of semi-opaque plastic, to make it more of a lampshade.

I also think that there is something missing with the glass but I think it
shouldn't have a smoth surface. I'm thinking about making sort of ridges.
I'll experiment a little...

/ Daniel Nilsson

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Do an http://images.google.com search for "bulkhead light" - you'll get some
great examples very similar to your own design...


"Daniel Nilsson" <dan### [at] daniel-nilssoncom> wrote in message
news:3d812488@news.povray.org...
> Hi, this is my first post and first serious attempt to make a POV-scene.
It
> will be a complete sauna but i have only made a macro to make the walls
and
> the lamp so far.
> What do you think about the lamp?
> I'm not sure about the metall wires that holds the glass thing, should
there
> be two vertical instead of one? How many horisontal? I have no reference,
> I'm just modeling from memory.
>
> --
> Daniel Nilsson
>
>
>

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Sir Charles W. Shults III wrote:

>     It looks great- except for one little thing.  This bulb should be either a
> SOR or a blob to get rid of the abrupt CSG "sphere to cylinder" transition.  

Sphere+Cone+torus(inverted and cut)+cylinder should lead to something 
smoother (I don't like SOR :-)

-- 
Jul### [at] cnedraorg
http://www.cnedra.org

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Here is a fast little blob bases light bulb- it was a bug light, hence the
yellow color.  This will give you an idea of how good it can look with almost no
effort.  now if I could only find the original source code.

Cheers!

Chip Shults
My robotics, space and CGI web page - http://home.cfl.rr.com/aichip

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Attachments:
Download 'Ltbulb.jpg' (4 KB)

Preview of image 'Ltbulb.jpg'

Sir Charles W. Shults III wrote:

>     Here is a fast little blob bases light bulb- it was a bug light, hence the
> yellow color.  This will give you an idea of how good it can look with almost no
> effort.  now if I could only find the original source code.


And here's a CSG one, made like this:

#declare LightBulb=merge{
    sphere { <0, 0, 0>, 3 }
    cone { <0, 1.4553, 0>, 2.6234, <0, 2.8474, 0>, 1.8511 }
    difference {
       cylinder { <0, 2.8473, 0>, <0, 3.8176, 0>, 1.8511 }
       torus {3.6, 2 translate <0, 3.8176, 0> }
    }
    cylinder { <0, 3.8176, 0>, <0, 4.6, 0>, 1.6 }
    torus { 1.2, 0.4 translate <0, 4.6, 0> }
  // Set ambient to 1 to "turn it on", and put a light source inside it
    texture { pigment { White } finish { ambient 0.0 }  }
    no_shadow
}

/Ib

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Yes, I use the cylinder/torus difference trick for other things as well.
Very useful.  Check out the solder joints on some parts here- also done with the
cylinder/torus difference.

Cheers!

Chip Shults
My robotics, space and CGI web page - http://home.cfl.rr.com/aichip

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>     Yes, I use the cylinder/torus difference trick for other things as well.


Well, where would we be without it. Couldn't do much neoclassical 
architechture without it :)

It does have it's problems, however. If you combine it with an concave 
shape like on the attached image (code below), the shading looks 
strange. I don't know if it is a problem with pov's shading model, or I 
just have wrong expectations to how a shape like this should look, but I 
don't think it looks right.

/Ib

--- code start ---
camera {
    location  <0, 10, -100>
    angle 30
    look_at   <0, 10,  0 >
}

light_source { <0, 500, -250>, colour White*2}

union {
    sphere { <0, 10, 0>, 10 }
    difference {
       cylinder { <0, 0, 0>, <0, 10, 0>, 20 }
       torus { 20, 10 translate <0, 10, 0> }
    }
    texture { pigment { Gray50 } finish { Phong_Shiny } }
}
--- code end ---

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Hey, you're right!  Perhaps we could use a slightly different sized sphere-
like just a hair larger- and move it downward a bit to compensate so the
intersection is the proper size?  It would be a real pain, but it could be
tried.

Cheers!

Chip Shults
My robotics, space and CGI web page - http://home.cfl.rr.com/aichip

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Sir Charles W. Shults III wrote:

>     Hey, you're right!  Perhaps we could use a slightly different sized sphere-
> like just a hair larger- and move it downward a bit to compensate so the
> intersection is the proper size?  It would be a real pain, but it could be
> tried.


It helps, but it takes more than a hair to get rid of the effect.
The attached image shows this variant:

union {
    sphere { <0, 7.1645, 0>, 10.2 }
    difference {
       cylinder { <0, 0, 0>, <0, 8.5963, 0>, 20 }
       torus { 20, 10 translate <0, 10, 0> }
    }
    texture { pigment { Gray50 } finish { Phong_Shiny } }
}

/ib

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