|
|
|
|
|
|
| |
| |
|
|
|
|
| |
| |
|
|
"Chris B" wrote in message <457d22d0@news.povray.org>:
> ttf "times.ttf","8",0.2, 0
Real mathematicians would use CMSY10.
Post a reply to this message
|
|
| |
| |
|
|
|
|
| |
| |
|
|
"dave vanhorn" wrote in message <457cb234@news.povray.org>:
> Has anyone done one of these, either by CSG or isosurface?
An infinity symbol is not a 3D object, so the question is: how do intend to
make it 3D? Do you want it infinitely thin? Flat but thick? Round?
You can do something easy with a sphere sweep:
sphere_sweep {
b_spline
9,
<-2, -2, 0>, 0.2,
< 0, 0, 0>, 0.2,
< 2, 2, 0>, 0.2,
< 2, -2, 0>, 0.2,
< 0, 0, 0>, 0.2,
<-2, 2, 0>, 0.2,
<-2, -2, 0>, 0.2,
< 0, 0, 0>, 0.2,
< 2, 2, 0>, 0.2
}
Post a reply to this message
|
|
| |
| |
|
|
|
|
| |
| |
|
|
"dave vanhorn" wrote in message <457cbdfb@news.povray.org>:
> I'd also be interested in how to do a mobius strip.
That can be done with a parametric object:
parametric {
function { (1 + v * sin(u / 2)) * cos(u) }
function { v * cos(u / 2) }
function { (1 + v * sin(u / 2)) * sin(u) }
<0, -0.2>, <2 * pi, 0.2>
contained_by { box { <-1.5, -1.5, -1.5>, <1.5, 1.5, 1.5> } }
}
This one is infinitely thin. If you want some thickness, you have to design
a path for the v parameter.
BTW, is it not possible to use vectorial arithmetics for parametric objects?
Post a reply to this message
|
|
| |
| |
|
|
|
|
| |
| |
|
|
> This one is infinitely thin. If you want some thickness, you have to
> design
> a path for the v parameter.
Thanks, I'll check that out.
All my pov experience previous has been with CSG, this is new to me.
> BTW, is it not possible to use vectorial arithmetics for parametric
> objects?
No idea.
Post a reply to this message
|
|
| |
| |
|
|
|
|
| |
| |
|
|
> Not as a CSG or an isosurface, but have you considered using the text
> object.
> Depending upon what you want it for, an 8 on it's side may serve your
> purposes.
Thanks, I did think of this last night, but the text ends up as a very
harsh object, I haven't found any way to round the corners, or otherwise
soften the appearance.
Something like a sphere sweep would be ideal.
Post a reply to this message
|
|
| |
| |
|
|
|
|
| |
| |
|
|
I'll give that a try too, thanks.
That's pov for ya, there's usually at least three ways you didn't think of,
to do something. :)
Post a reply to this message
|
|
| |
| |
|
|
|
|
| |
| |
|
|
"dave vanhorn" <mic### [at] gmailcom> wrote:
> I'd also be interested in how to do a mobius strip.
Posted in binary scene-files.
-tgq
Post a reply to this message
|
|
| |
| |
|
|
|
|
| |
| |
|
|
"Trevor G Quayle" <Tin### [at] hotmailcom> wrote:
> "dave vanhorn" <mic### [at] gmailcom> wrote:
> > I'd also be interested in how to do a mobius strip.
>
> Posted in binary scene-files.
>
> -tgq
Hmm, don't know where my original response went...
Anyways, I posted a series of macros I did about 4 years ago. There is a
mesh2 mobius strip with uv_mapping support and a macro for a mobius built
of a user-defined object. Hope this is of some use for you.
-tgq
Post a reply to this message
|
|
| |
| |
|
|
|
|
| |
| |
|
|
dave vanhorn wrote:
> Has anyone done one of these, either by CSG or isosurface? I've been
> playing with stretched rings, but they just don't look right.
>
The simplest CSG would probably be for example, a union of spheres
along the shape. The shape of infty symbol
is the lemniscate - see e.g.
http://mathworld.wolfram.com/Lemniscate.html
there you can find the parametric equations for it.
Post a reply to this message
|
|
| |
| |
|
|
|
|
| |
| |
|
|
bart wrote:
> dave vanhorn wrote:
>> Has anyone done one of these, either by CSG or isosurface? I've been
>> playing with stretched rings, but they just don't look right.
>>
>
> The simplest CSG would probably be for example, a union of spheres
> along the shape. The shape of infty symbol
> is the lemniscate - see e.g.
> http://mathworld.wolfram.com/Lemniscate.html
> there you can find the parametric equations for it.
...or you can even try to slice a toric section of a torus...
Post a reply to this message
|
|
| |
| |
|
|
|
|
| |