Celestia Forums

Sorry to bother, but is there a problem I'm missing in the
SSC file below? This is from Jestr's A-Wing Fighter which is one
of the add-ons at the Motherlode.

If I simply replace this ssc file with another one, I can view the A-Wing
with no problem. However, I haven't quite figured out what the
problem is here. Anyone see anything wrong? The spacecraft
simply does NOT show up in orbit around Endor. Nor can I find it
anywhere within the Rho Crb system.



Thanks, Brain-Dead

Well I'm missing the eccentricity, inclination and arg of pericenter for the orbit. I don't think the ssc file contains enough data to be able to calculate an orbit.

Celestia requires only that SemiMajorAxis and Period be specified. The other fields have "reasonable" defaults. These are spelled out in detail in the WikiBook at http://en.wikibooks.org/wiki/Celestia/S ... ers..._.7D

selden wrote:Celestia requires only that SemiMajorAxis and Period be specified. The other fields have "reasonable" defaults. These are spelled out in detail in the WikiBook at http://en.wikibooks.org/wiki/Celestia/S ... ers..._.7D

As always, Selden, Thanks. I have been so busy lately that I almost
forgot that we even had a WikiBook site.

BobHegwood wrote:Sorry to bother, but is there a problem I'm missing in the
SSC file below? This is from Jestr's A-Wing Fighter which is one
of the add-ons at the Motherlode.

If I simply replace this ssc file with another one, I can view the A-Wing
with no problem.

Can you post this SSC file that we may compare them?

BobHegwood wrote:However, I haven't quite figured out what the
problem is here. Anyone see anything wrong? The spacecraft
simply does NOT show up in orbit around Endor. Nor can I find it
anywhere within the Rho Crb system.

Code: Select all

"A-Wing" "HD 143761/Endor"
{
        Class "spacecraft"
        Mesh "Awing.3ds"
        Color [ 0 0 0 ]
        Radius 0.03

        EllipticalOrbit {
        Period        0.2
        SemiMajorAxis 6501
        MeanAnomaly  120
        }
        Orientation [ 90 0 1 0 ]
        Albedo 1.0
}

Thanks, Brain-Dead

Possible issues:
* File name of mesh may be incorrect. If you are running on a system with case-sensitive filenames, the mesh won't appear. The location will still be there but the mesh will be invisible.
* What is the radius of Endor? If Endor has a radius greater than the semimajor axis the spacecraft will appear inside the planet.
* You have an Albedo of 1. It is better have an albedo between 0 and 1. I suggest a value of 0.5 until you tweak this.
* I cannot find Orientation in the documentation. How does this work?

See the continuing discussion HERE.

Still trying to figure it out with Selden's help.

Thanks, Bob