Re: Two sphers joined by a line and moving on an ellipse! (animation)

• To: mathgroup at smc.vnet.net
• Subject: [mg82747] Re: [mg82701] Two sphers joined by a line and moving on an ellipse! (animation)
• Date: Tue, 30 Oct 2007 03:32:22 -0500 (EST)
• References: <200710291032.FAA06083@smc.vnet.net>

```Hi Mark,

you didn=B4t tell what is the animation that you want, so below I send a
Manipulate and an animate codes:

a = 2;
b = 3;

r = 0.5;

Manipulate[Show[{
ParametricPlot3D[{a Cos[\[Theta]], b Sin[\[Theta]], 0}, {\[Theta],
0, 2 \[Pi]}, PlotRange -> (Max[{a, b}] + r), Axes -> False,
Boxed -> False, PlotStyle -> {Thick, Dashed}]
, Graphics3D[{
Sphere[{a Cos[\[Theta]1], b Sin[\[Theta]1], 0}, r],
Sphere[{a Cos[\[Theta]2], b Sin[\[Theta]2], 0}, r],
{Thick, Orange,
Line[{{a Cos[\[Theta]1], b Sin[\[Theta]1],
0}, {a Cos[\[Theta]2], b Sin[\[Theta]2], 0}}]}
}]}],
{\[Theta]1, 0, 2 \[Pi]},
{{\[Theta]2, \[Pi]}, 0, 2 \[Pi]}]

Animate[Show[{
ParametricPlot3D[{a Cos[\[Theta]], b Sin[\[Theta]], 0}, {\[Theta],
0, 2 \[Pi]}, PlotRange -> (Max[{a, b}] + r), Axes -> False,
Boxed -> False, PlotStyle -> {Thick, Dashed}]
, Graphics3D[{
Sphere[{a Cos[\[Theta]1], b Sin[\[Theta]1], 0}, r],
Sphere[{a Cos[\[Theta]2], b Sin[\[Theta]2], 0}, r],
{Thick, Orange,
Line[{{a Cos[\[Theta]1], b Sin[\[Theta]1],
0}, {a Cos[\[Theta]2], b Sin[\[Theta]2], 0}}]}
}]}],
{\[Theta]1, 0, 2 \[Pi]},
{{\[Theta]2, \[Pi]}, 0, 2 \[Pi]}]

Hope this helps.

Ricardo

>
> Hello everybody,
>
> I'am trying to create an animation of two sphers joined by a line and
> moving on an ellipse.
>
> I have ploted the ellipse as
>
> Graphics[{Dashed, Circle[{0, 0}, {10, 5}]}]
>
> and the two sphers joined by a line as
>
> Graphics3D[{Sphere[{0, 0, 0}, 1],
>   Sphere[{-5, -1, -1}], {Thick, Orange,
>    Line[{{0, 0, 0}, {-5, -1, -1}}]}}, Boxed -> False,
> ImageSize -> 100]
>
> after that I could not make any further step!
>
> I would appreciate any help.
>
>
> thanks, Mark
>
>
>

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