POV-Ray : Newsgroups : povray.text.tutorials : Help on doing a plastic lamp shade Server Time: 14 Dec 2018 01:35:35 GMT
  Help on doing a plastic lamp shade (Message 1 to 2 of 2)  
From: Wade
Subject: Help on doing a plastic lamp shade
Date: 8 Aug 2002 20:31:30
Message: <3d52d522@news.povray.org>
I'd like to learn how make a plastic-marblized lamp shade.

Wade
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From: hughes b
Subject: Re: Help on doing a plastic lamp shade
Date: 8 Aug 2002 23:18:29
Message: <3d52fc45@news.povray.org>
"Wade" <Zav### [at] aolcom> wrote in message news:3d52d522@news.povray.org...
> I'd like to learn how make a plastic-marblized lamp shade.

Hi there Wade.

Basically you would use a filtered pigment with a color pattern applied. A
not too technical a lampshade  like that is just:

cone {0,1,y,0.5
texture {
 pigment {marble // pattern needed, could be any
  color_map {
    [0/4 color rgbf <0,0,1,1>]
    [1/4 color rgbf <0,0,1,1>] // sharp boundaries...
    [1/4 color rgbf <1,0,1,1>] // ...by duplicating index
    [2/4 color rgbf <1,0,1,1>]
    [2/4 color rgbf <1,0,0,1>]
    [3/4 color rgbf <1,0,0,1>]
    [3/4 color rgbf <1,1,0,1>]
    [4/4 color rgbf <1,1,0,1>]
    }
 turbulence 0.5 // less for straighter lines... more is gnarled
 scale 0.25 // reduce pattern size for this cone
  }
 }
    finish {ambient 0.2 diffuse 0.5
                specular 0.5 roughness 0.05} // typical plastic appearance
}

Not to get too elaborate or anything. The idea is to filter the light
through colors just like in the real world. If the shade itself isn't
looking lit well enough you can try adding more ambient to the finish to get
it brighter. To get the walls and stuff around the shade to show the colors
better more filter value (4th float in the rgbf vector) could be used but
ambient would need to be lowered then. Opposite if wanted the other way of
course.

There are a number of ways to go about making a lampshade but maybe this is
a start. There are probably several examples already someplace
(www.povray.org search?) but I didn't check for any.

P.S.

You'd have tapped in to more people at povray.general than the two tutorial
groups.

<'netiquette>Also, "multi-posting" isn't looked upon as acceptable, it
leaves the same or similar message to be read again looking like a new
message. Cross-posting at two groups (usually not more), however, can be
done with one message and then not be marked unread when the readers move to
another group.
Simple append the other group name after the first (MS Outlook for example:
Newsgroups: povray.general;povray.text.tutorials).</'netiquette>

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