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I've been out of the POV scene for quite a few years (since I left
compuserve!) and I'm trying to get back into it.
I'm attempting to create a 3D 5-pointed star that is faceted like a gem,
kind of like this
http://www.lidinc.com/Merchant2/graphics/00000001/SM%20STAR%20K166%20GIF.jpg,
and it's bugging me. I know I could create it by calculating the points
and putting them into a mesh, but there must be a simpler way of getting
POV to do all the hard work.
Any pointers/links etc would be really helpful.
Many thanks
Dan
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"busabus" <nomail@nomail> wrote:
> I've been out of the POV scene for quite a few years (since I left
> compuserve!) and I'm trying to get back into it.
>
> I'm attempting to create a 3D 5-pointed star that is faceted like a gem,
> kind of like this
> http://www.lidinc.com/Merchant2/graphics/00000001/SM%20STAR%20K166%20GIF.jpg,
> and it's bugging me. I know I could create it by calculating the points
> and putting them into a mesh, but there must be a simpler way of getting
> POV to do all the hard work.
>
> Any pointers/links etc would be really helpful.
>
> Many thanks
>
> Dan
Using math, and pyrimids, I think you might be able to create one
pretty easy.
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"Skeety" <nomail@nomail> wrote:
> "busabus" <nomail@nomail> wrote:
> > I've been out of the POV scene for quite a few years (since I left
> > compuserve!) and I'm trying to get back into it.
> >
> > I'm attempting to create a 3D 5-pointed star that is faceted like a gem,
> > kind of like this
> > http://www.lidinc.com/Merchant2/graphics/00000001/SM%20STAR%20K166%20GIF.jpg,
> > and it's bugging me. I know I could create it by calculating the points
> > and putting them into a mesh, but there must be a simpler way of getting
> > POV to do all the hard work.
> >
> > Any pointers/links etc would be really helpful.
> >
> > Many thanks
> >
> > Dan
>
> Using math, and pyrimids, I think you might be able to create one
> pretty easy.
Seeing as there isn't a pyramid primitive (please correct me if I'm wrong)
are you suggesting using cubes and plane intersections?
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>
> Seeing as there isn't a pyramid primitive (please correct me if I'm
> wrong) are you suggesting using cubes and plane intersections?
>
What about using a prism with a conic sweep for half of it. Then mirror it.
--
l'habillement, les chaussures que le maquillage et les accessoires.
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Wasn't it busabus who wrote:
>I've been out of the POV scene for quite a few years (since I left
>compuserve!) and I'm trying to get back into it.
>
>I'm attempting to create a 3D 5-pointed star that is faceted like a gem,
>kind of like this
>http://www.lidinc.com/Merchant2/graphics/00000001/SM%20STAR%20K166%20GIF.jpg,
>and it's bugging me. I know I could create it by calculating the points
>and putting them into a mesh, but there must be a simpler way of getting
>POV to do all the hard work.
>
>Any pointers/links etc would be really helpful.
How about using five stretched octahedrons, something like this but with
better material and lighting?
#version 3.6;
global_settings {
assumed_gamma 1.0
max_trace_level 15
}
camera {location <-4,5,-20> look_at <0,0,0> angle 40}
background {rgb 1}
light_source {<-30, 100, -30> color rgb 1}
#include"shapes.inc"
#include"shapes2.inc"
#include"glass.inc"
union {
#declare N=0;
#while (N<5)
object{Octahedron
scale <1,1.9,1> // stretch in y direction
rotate y*45 // bring an edge to the front
translate y*1.3 // move away from centre
rotate z*360/5*N // rotate each point
}
#declare N=N+1;
#end
texture {T_Old_Glass}
interior {I_Glass1}
}
--
Mike Williams
Gentleman of Leisure
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From: Tom Melly
Subject: Re: Help creating a 5-pointed gem like star
Date: 14 Nov 2004 15:00:04
Message: <4197b944@news.povray.org>
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"busabus" <nomail@nomail> wrote in message
news:web.4194a37fc3889db3abbc0b2f0@news.povray.org...
> and it's bugging me. I know I could create it by calculating the points
> and putting them into a mesh, but there must be a simpler way of getting
The more I think about this the more I think a mesh is the way to go.
Not really that hard - build your mesh using a macro.
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"Tom Melly" <pov### [at] tomandlu couk> wrote:
> "busabus" <nomail@nomail> wrote in message
> news:web.4194a37fc3889db3abbc0b2f0@news.povray.org...
>
> > and it's bugging me. I know I could create it by calculating the points
> > and putting them into a mesh, but there must be a simpler way of getting
>
> The more I think about this the more I think a mesh is the way to go.
>
> Not really that hard - build your mesh using a macro.
Thanks to everyone for their help on this. I ended up going down the
intersection route by cutting a cube into what I'd call a sloped three
sided pyramid, then squashing it, copying it, squashing that and copying
that.
#include "glass.inc"
camera { location <-2, 0, -4> look_at <0, 0, 0> angle 40}
background { color rgb 1 }
light_source {<5,5,-5> colour rgb 1}
#declare starGlass =
texture {
pigment{rgbf <1,1,0,0.8>}
finish {F_Glass9}
}
#declare facet =
difference {
box {<-0.5001,0.5001,0.5001> <0.5001,-0.5001,-0.5001>}
object {
plane {z,0}
rotate <45,0,0>
}
object {
plane {x,0}
rotate <0,0,-45>
}
translate <-0.5,0.5,-0.5>
scale<0.5,1,0.5>
rotate<0,-45,0>
}
#declare point =
merge {
#declare i=1;
#while(i<=4)
object{facet
rotate<0,90*i,0>
translate<0,0,0>
}
#declare i=i+1;
#end
scale<0.75,1,0.5>
}
merge{
#declare i=1;
#while(i<=5)
object{point
rotate<0,0,72*i>
}
#declare i=i+1;
#end
texture {starGlass}
interior {I_Glass1}
photons {
target
refraction on
reflection on
}
}
If anyone's got some comments on this code then please feel free. Also
suggestions on getting the gem to sparkly a bit and not look like crap I
would be grateful for.
Cheers
Daniel
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busabus wrote:
> If anyone's got some comments on this code then please feel free.
Not nice enough for a subject item. Good enough for something small.
> Also suggestions on getting the gem to sparkly a bit and not look
> like crap I would be grateful for.
Add more facets. You really need to just make this a mesh.
-Shay
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