General Category > General Anim8or Forum
A Matter of Proportion?
argo34116:
Use surface textures from other posts, but here it is again. Thank you for your help
selden:
herewith.
argo34116:
Thank you soooooo much Selden. They look great. I have another question though. I have a add on for Celestia that displays the battlestar galactica viper mkII. I copied the ssc file "hammerheads chasing the ISS" and modified it to make a group of three Viper MkII and placed them in orbit around Rigel with the craft from the Galactica TOS add on. It worked great, but the models exhibit a jumpy motion when displayed. What is causing this? Can it be fixed. Otherwise they look great. I have included the file below with both the original and the revised ssc.
selden:
It's because you've got them on an orbit which is very tiny, orbiting rapidly, and inside the star. An orbit which is appropriate for going around the Earth doesn't work well for going around a star. If you specify a larger orbit, one which places the spacecraft outside the star, they won't jump around. e.g.
EllipticalOrbit {
Period 1
SemiMajorAxis 1
}
This is just an example to make it display well. A period of 1 (year) at a distance of 1 (AU) is only correct for orbits around our own Sun. Rigel is a much more massive star, so orbits around it have much shorter orbital periods for orbits with a given semimajor axis. If you want it to be more realistic, you'll need to do some research and a little algebra to define an orbit which has more appropriate parameters for this star (at a larger SMA so the pilots don't cook, for example :) ) and with the correct period for that SMA.
However, this isn't a topic directly related to Anim8or, so it might be more appropriate to discuss it in a PM (Private Message).
argo34116:
Sorry. Thank you though. That did the trick
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