[Squeakland] sun-earth-moon

Nicholas Bennett nicholasjbennett at hotmail.com
Thu Feb 16 13:59:29 PST 2006


I had done a sun earth moon system once and found that one could set the 
rotation center fairly easily (I think one of the halo menu choices maybe, 
also there I think you can tell it to display the rotation center and the 
forward vector which can help visualize things).

I had used the embedding as described below, but found that if I simply 
embedded earth in sun the earth would be 'unselectable' when it did not 
overlap with the sun - which made it awkward if you wanted to go back and 
add the moon later. I ended up painting the 'orbit center' of my 'orbiters' 
as a small dot in the orbiters sketch - a bit strange maybe but it made it 
very clear where the rotation center should be and ensured that the orbiters 
stayed selectable when embedded.


>From: Bert Freudenberg <bert at impara.de>
>To: Mailinglist Squeakland <squeakland at squeakland.org>
>Subject: Re: [Squeakland] sun-earth-moon
>Date: Thu, 16 Feb 2006 19:08:22 +0100
>Am 16.02.2006 um 16:43 schrieb Randy Heiland:
> > Is it possible to squeak planetary motion?
>Yes. You have to embed the moon into the earth (you find "embed" in
>the halo menu). Then, when you move the earth, the moon already moves
>with it.
>Here's an example:
>	http://squeakland.org/project.jsp?http://impara.de/~bert/projects/
>- Bert -
>Squeakland mailing list
>Squeakland at squeakland.org

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