randy,
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.
regards, nicholas
From: Bert Freudenberg bert@impara.de To: Mailinglist Squeakland squeakland@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/ Sonne-Erde-Mond.001.pr
- Bert -
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