Celestia Forums

Ephemeris Type [change] : VECTORS
Target Body [change] : LCROSS Spacecraft [-18]
Coordinate Origin [change] : Geocentric [500]
Time Span [change] : Start=2009-JUN-02 21:35:33.3049, Stop=2009-OCT-07 09:36:06.1823, Step=30 m
Table Settings [change] : output units=KM-S; quantities code=2; CSV format=YES
Display/Output [change] : default (formatted HTML)

http://lcross.arc.nasa.gov
http://www.nasa.gov/mission_pages/LCROS ... index.html

???



Ephemeris Type [change] : VECTORS
Target Body [change] : LCROSS Spacecraft [-18]
Coordinate Origin [change] : Geocentric [500]
Time Span [change] : Start=2009-06-02 21:35:33.3049, Stop=2009-10-07 09:36:06.1823, Step=30 m
Table Settings [change] : output units=KM-S; quantities code=2; CSV format=YES
Display/Output [change] : default (formatted HTML)

Chuft-Captain help

"LCROSS Spacecraft" "Sol/Earth"
{
Class "spacecraft"
Radius 0.0035

OrbitFrame { EclipticJ2000 { Center "Sol/Earth" } } <=
SampledTrajectory { Source "test.xyzv" }

Albedo 0.15
}

@+

Thanks,

Close!

Just in time for the Lunar flyby....

LCROSS add-on for Celestia 1.5.1
LCROSS and Centaur models - .3ds, .jpg
Spacecraft .ssc and .xyz files
readme.txt

Available from:
EDIT: Link removed - updated package available on Celestia Motherlode
(my website has a very limited bandwidth allowance, so I hope it's not too popular!)

Regards,
Brian

Brian,

You might want to consider uploading it to the Celestia MotherLode.
It's free and has lots of bandwidth.
http://www.celestiamotherlode.net/upload.php

Hi Selden,
I'll certainly do that in due course, but I wasn't sure how quick the good people(person?) at the Motherlode could get it on the servers and I thought some folks might like to use it to follow the flyby tomorrow.

Also, there's still a bit of work to do:- I'd like to see if I can write a script to change the BodyFrame properties during the simulation(is that possible? any pointers gratefully received).

And some kind of representation of the Centaur impact would be fun - I'd use a sprite but I don't have OpenGL2.0 so I can't use 'em Maybe I can think of something, though.

Cheers,
Brian

BrianJ wrote:Hi Selden,
I'll certainly do that in due course, but I wasn't sure how quick the good people(person?) at the Motherlode could get it on the servers and I thought some folks might like to use it to follow the flyby tomorrow.

That's certainly reasonable.

Also, there's still a bit of work to do:- I'd like to see if I can write a script to change the BodyFrame properties during the simulation(is that possible? any pointers gratefully received).

You can't directly change the body frame, but you can change the orientation of the object relative to that frame using a ScriptedRotation or SampledOrientation . See http://en.wikibooks.org/wiki/Celestia/Rotation_Models

And some kind of representation of the Centaur impact would be fun - I'd use a sprite but I don't have OpenGL2.0 so I can't use 'em Maybe I can think of something, though.

Cheers,
Brian

Sometimes a translucent model can have a reasonable appearance, with a ScriptedOrbit to change its Radius so it looks like an explosion. Using Beginning and Ending so it appears briefly might be an acceptable compromise, too.

BrianJ wrote:I'll certainly do that in due course, but I wasn't sure how quick the good people(person?) at the Motherlode could get it on the servers and I thought some folks might like to use it to follow the flyby tomorrow.

Brian, just FYI it takes (generally) three or four days to appear on the Motherlode.
I test all add-ons immediately after they are made available to me by Ulrich. If they
have no problems, then Ulrich adds them to the public directory as soon as he is
able.

Again, just FYI.

Thanks, Brain-Dead

Selden:Thanks for the tips. At least I won't waste my time trying figure out how to change BodyFrame in-sim.

Bob: Thanks for the info, good to know you're "on the case" quality control wise.

Cheers,
Brian

BrianJ wrote:Selden:Thanks for the tips. At least I won't waste my time trying figure out how to change BodyFrame in-sim.

My words were very carefully chosen.

There are a couple of ways to introduce different BodyFrame declarations to control an object.

One is to define an intermediate invisible object which is used as a reference body for the visible one. Changing the orientation of the intermediate object would also change the orientation of the visible object.

Another is to use the Timeline construct to define several different orbits and orientations for a body, each of which is effective for a specific time interval. This capability is available only in v1.6 or later. See http://en.wikibooks.org/wiki/Celestia/1 ... _Timelines

Thanks Selden, "timeline" function will be very useful for implementing spacecraft in Celestia, but I've stuck with compatibility for the current Celestia 1.5.1 for the moment.

Updated LCROSS package now available on Celestia Motherlode
http://www.celestiamotherlode.net/catal ... on_id=1336
(thank you Ulrich and Bob)

Regards,
Brian

BrianJ wrote:Updated LCROSS package now available on Celestia Motherlode
http://www.celestiamotherlode.net/catal ... on_id=1336
(thank you Ulrich and Bob)

You are welcome.
I did make it also available via the start page (New Addon!): http://www.celestiamotherlode.net/

Adirondack

New to Celestia Motherlode and have question about the LCROSS spacecraft 3ds model. I downloaded the zip folder and tried to open or import to my 3ds Max 2010 which displayed the model as 'Improper file format.' Do have the latest direct x on my window system.
Help? JimT503

JimT503 wrote:New to Celestia Motherlode and have question about the LCROSS spacecraft 3ds model. I downloaded the zip folder and tried to open or import to my 3ds Max 2010 which displayed the model as 'Improper file format.' Do have the latest direct x on my window system.
Help? JimT503

Don't know what to tell you my friend. It works fine in my Anim8or program.
Maybe try that? Just a thought...

Thanks, Brain-Dead

JimT503 wrote:New to Celestia Motherlode and have question about the LCROSS spacecraft 3ds model. I downloaded the zip folder and tried to open or import to my 3ds Max 2010 which displayed the model as 'Improper file format.' Do have the latest direct x on my window system.
Help? JimT503

Don't know what to tell you my friend. It works fine in my Anim8or program.
Maybe try that? Just a thought...

Thanks, Brain-Dead