Celestia Forums

I noticed that the Impactor (from Deep Impact) I have, rotates around an outside centerpoint versus rotating around its center.

I looked in the .ssc file for Deep Impact, but I don't know which variable controls the spin. I would appreciate any help I can get.

Cheers,
Jeff

Jeff,

Generally this would be controlled by RotationPeriod (expressed in hours), however though I'm not familiar with the Deep Impact addon, from your description of an external centerpoint, I suspect it may have been implemented as an orbit around an invisible object.
Look for something like this in the SSC file:

If that's the case, then the rotation speed is determined by the "Period" statement. (NOTE: units will be in years, not hours in this case)

..or perhaps the center should be reajusted with:



(you will have to find out the coordinates)
In that case, the model should perhaps also be reoriented...

BTW Jeff,

Is this suposed to be a realistic scenario? What I don't understand is how an object (presumedly in free space) can rotate around an external centerpoint which cannot possibly be it's center of mass.

Jeff,

Jestr often builds his models into invisible spheres. I noticed that when I wrote the Deep Imapct Mission script. The impactor probably rotates around the sphere center instead of the impactor's center...