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Topic: Planets
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charlott sophia  27
10-29-2003 10:30 AM ET (US)
Hi!
Obviously you are using some physics to get it all running. Could you give me some clues as to what the units are on the numbers in the text files? I tried to put in our solar system, but could not get it right, since I don't know if I am looking at metres or miles, seconds or years...
That would be really cool!

Thanks!
janek kozicki  26
06-11-2003 06:12 PM ET (US)
i tried to make something BIG, with sun and moons ....

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Yaron M. MinskyPerson was signed in when posted  25
09-02-2002 01:03 PM ET (US)
Glad you like it. You're right that it would be nice to have a place for posing galaxies, and I'll get one up eventually. For the moment, however, you can just post them here. The galaxies are just text files, after all. I'll post a few to get things started. Just copy them out and past them into a file in your .planets directory.

Here's one that works well if you first turn on bouncing by pressing B:

zoom 1.00000000000000000000e+00
center (-3.43870947544445328958e+01, -1.26702504559301829090e+02)
delta 5.99999999999999977796e-02

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   pos (1.69187009854613023663e+02, -1.29386684262278777169e+02)
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   radius 1.50000000000000000000e+01
   mass 3.37500000000000000000e+03
   color "#E74754"
   id 201645582

And here's another with two planets orbiting each other, each with its own small planet in a close orbit:

zoom 9.55004950796826544875e-04
center (9.01266396642047766363e+04, 4.29577099593028760864e+04)
delta 5.99999999999999977796e-02

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Joe Julian  24
09-02-2002 06:25 AM ET (US)
Rather fun... Pause it and scroll all over the place putting in planets with large vectors all heading away from the center... Make your own big bang! :)

You need a place on the web site for exchanging galaxies.
Alessandro Pezzato  23
07-21-2002 03:23 PM ET (US)
Very cool this program!!! I could use it for hours...
Ari Trachtenberg  22
07-07-2002 11:35 AM ET (US)
Excellent for kids and adults alike!
I laughed, I cried, ... it was better
than "Cats"!
Yaron M. Minsky  21
07-05-2002 05:45 PM ET (US)
On Fri, 2002-07-05 at 17:30, QT - Marco Paganini wrote:
> Very cool! Reminds me of one very old (and very cool) EGA Game
> called "Spacewars" where you played against an opponent on the
> keyboard. The trick was exactly to orbit a planet. It was cool
> to find new "stable orbits" that worked to your advantage...
>
> But, back to planets. :)
>
> I miss:
>
> - An option to freeze the simulation when I add a planet

Well, you're in luck. Press "p" to pause the simulation. You can add planets in pause mode. Then "p" again to get out.

> - A rollback option (so I can correct the planets/vectors)

"g" goes back to just after the last planet addition, "u" goes back to just before the last planet addition. Basically, "g" is to replay recent events, and "u" is to undo.

> Sound would also be cool! :)
>
> Anyway, it's cool as it is.

Glad you like it.

y
Marco Paganini  20
07-05-2002 05:30 PM ET (US)
Very cool! Reminds me of one very old (and very cool) EGA Game called "Spacewars" where you played against an opponent on the keyboard. The trick was exactly to orbit a planet. It was cool to find new "stable orbits" that worked to your advantage...

But, back to planets. :)

I miss:

- An option to freeze the simulation when I add a planet
- A rollback option (so I can correct the planets/vectors)

Sound would also be cool! :)

Anyway, it's cool as it is.
Paga
jessica martina watson  19
04-16-2002 11:40 PM ET (US)
Deleted by author 04-16-2002 11:40 PM
   18
04-16-2002 11:35 PM ET (US)
Deleted by topic administrator 04-20-2002 09:42 AM
Yaron M. MinskyPerson was signed in when posted  17
03-23-2002 06:53 AM ET (US)
Yeah, it's a UNIX program really, and is easy to use from UNIX, but it's not well set up for Windows, and I don't have the time (or inclination, really) to set it up to be really easy for Windows.

As for "l" and "s", I have a guess as to what the problem might be, and will take a look at the code. As a temporary fix, if you know how to change environment variables, try defining one of your directories as HOME. planets should create a subdirectory of that called ".planets", and put the files in there.
Ralph Gallager  16
03-22-2002 01:44 PM ET (US)
Great effort, neat program. Not for the novice who just wants to play around unless you can develope a better setup process.

? "l" and "s" don't work for me. wrong directory(s) maybe?

thanks

Ralph

PS AMD700 on win2k
Ralph Gallager  15
03-22-2002 01:43 PM ET (US)
Great effort, neat program. Not for the novice who just wants to play around unless you can develope a better setup process.

? "l" and "s" don't work for me. wrong directory(s) maybe?

thanks

Ralph
Yaron Minsky  14
03-09-2002 04:14 PM ET (US)
Take a look at the webpage. There's a link to a Tcl/Tk download (roughly 7Mb, sadly) that you should install and then reboot before trying to run planets.
rcd22  13
03-09-2002 03:41 PM ET (US)
missing tc83.dll file? how do I get that?
Yaron M. MinskyPerson was signed in when posted  12
02-28-2002 05:34 PM ET (US)
I just recompiled my RPM on a redhat 7.0 system, and I supspect this newer RPM should work on Mandrake now.
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