Favorite Celestia Views (a cel://URL Repository)

All about writing scripts for Celestia in Lua and the .cel system
Hoover
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Post #41by Hoover » 07.03.2005, 21:56

Oh, I'm not doubting you or Celestia. I'm doubting the press. It was said that flying Cassini through the ring plane was a calculated risk but a low one. The reason is "that it had been done before and they knew what to expect".

Now they were also not talking about he heart of the ring either. They were talking about a gap close to the edge. Even so, Pioneer 11 doesn't show any evidence of even crossing the rings.

That is why I suggested it might have been another craft. But I don't think any other probe ever visited Saturn. So where this evidence was coming from is beyond me. Faulty reporting probably.

TERRIER
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Post #42by TERRIER » 08.03.2005, 16:14

Mustn't forget about Voyager 1 and 2.
Certainly both Voyagers crossed the ring plane but I'm not sure if they physically went through the rings.

Anyway, here are some more "cel//urls" that offer a ring side seat of the other 3 fly-bys of Saturn to complete the set !

Voyager 1 (Download From the Motherlode )

cel://PhaseLock/Sol:Voyager%201/Sol:Sat ... 20291&lm=0

Voyager 2 (Included with Voyager 1)

cel://PhaseLock/Sol:Voyager%202/Sol:Sat ... 20291&lm=0

Cassini (Download jestr and Toti's latest )

cel://PhaseLock/Sol:Cassini/Sol:Saturn/ ... 20291&lm=0

cheers,
TERRIER
1.6.0:AMDAth1.2GHz 1GbDDR266:Ge6200 256mbDDR250:WinXP-SP3:1280x1024x32FS:v196.21@AA4x:AF16x:IS=HQ:T.Buff=ON Earth16Kdds@15KkmArctic2000AD:FOV1:SPEC L5dds:NORM L5dxt5:CLOUD L5dds:
NIGHT L5dds:MOON L4dds:GALXY ON:MAG 15.2-SAP:TIME 1000x:RP=OGL2:10.3FPS

Hoover
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Post #43by Hoover » 08.03.2005, 16:42

Love that flyby of Titan on Voyager I. And the Pleiades in the background on the Cassini flyby.

Looks like V1 and V2 did cross the ring plane at the outer edge. Parts of the ring thin enough they can't be seen. This is what they were talking about for Casinni. I guess I wasn't high nor was the press too far off this time.

Excellent views, I've saved them to my own url list.

TERRIER
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Post #44by TERRIER » 10.03.2005, 00:38

Here's another "cel//url" that I think is pretty cool.

cel://Follow/Sol:Earth/2005-03-09T18:07 ... 291&lm=128

You need to have a full Earth VT and the Las Vegas high res textures ( which are in dds).

regards,
TERRIER
1.6.0:AMDAth1.2GHz 1GbDDR266:Ge6200 256mbDDR250:WinXP-SP3:1280x1024x32FS:v196.21@AA4x:AF16x:IS=HQ:T.Buff=ON Earth16Kdds@15KkmArctic2000AD:FOV1:SPEC L5dds:NORM L5dxt5:CLOUD L5dds:
NIGHT L5dds:MOON L4dds:GALXY ON:MAG 15.2-SAP:TIME 1000x:RP=OGL2:10.3FPS

TERRIER
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Post #45by TERRIER » 09.04.2005, 10:23

I didn't have too much to do last Thursday, so for starters I thought I'd take a trip to Guatemala City, to witness the partial solar eclipse.

Then it was off to Saturn to look at all 17 Cassini Fly-by events for this year, as listed on the NASA Cassini-Huygenswebsite.

All the 'CEL://URL's' have been taken by using jestr and Toti's new cmod model and orbit files.
A table containing the 'CEL://URL's' can be found directlyhere.
Or by looking for TERRIERS_CELESTIA_CASSINI_EVENT.htmhere

cheers,
TERRIER
1.6.0:AMDAth1.2GHz 1GbDDR266:Ge6200 256mbDDR250:WinXP-SP3:1280x1024x32FS:v196.21@AA4x:AF16x:IS=HQ:T.Buff=ON Earth16Kdds@15KkmArctic2000AD:FOV1:SPEC L5dds:NORM L5dxt5:CLOUD L5dds:
NIGHT L5dds:MOON L4dds:GALXY ON:MAG 15.2-SAP:TIME 1000x:RP=OGL2:10.3FPS

Hoover
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Post #46by Hoover » 09.04.2005, 11:26

In the March 9th flyby simulation, there is an interesting vibration effect as Cassini approaches Enceladus. Saturn's ring plane is edge on and the distance between that and Enceladus seems to vary as it approaches.

I'm wondering if it isn't an optical illusion? I'm watching at 1000x to see it.

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selden
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Post #47by selden » 09.04.2005, 12:43

"It looks fine to me!"

Can you provide a URL so your exact point of view could be duplicated?

System:
256MB 500MHz P3, WinXP Pro SP2
128MB FX 5700LE, ForceWare v67.66
Celestia v1.4.0pre6
Selden

Hoover
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Post #48by Hoover » 09.04.2005, 14:14

selden wrote:"It looks fine to me!"

Can you provide a URL so your exact point of view could be duplicated?

System:
256MB 500MHz P3, WinXP Pro SP2
128MB FX 5700LE, ForceWare v67.66
Celestia v1.4.0pre6


Watch from this point here. I'm talking about the perceived distance between Enceladus and the ring plane as it moves along. If I slow it down it isn't as pronounced. I don't think there is anything wrong here! But I would be interested on why the subtle movements make it "feel like I'm on a bumpy road".

cel://PhaseLock/Sol:Cassini/Sol:Saturn:Enceladus/2005-03-09T07:37:21.48612?x=uNRok5ATS01/DA&y=Z5niGwzYmTw&z=fmQiUxBvPwx//////////w&ow=0.784467&ox=0.046522&oy=-0.617226&oz=-0.038473&select=Sol:Cassini&fov=25.326742&ts=1000.000000&ltd=0&rf=82220307&lm=4

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selden
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Post #49by selden » 09.04.2005, 14:25

Sorry: I just don't see the effect you describe. I just see the visual separation between the rings and the moon smoothly decreasing as the viewpoint gets closer to Enceladus. There is the differing background light due to the location of Saturn, but that's the only variation I see.
Selden

Hoover
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Post #50by Hoover » 09.04.2005, 15:35

selden wrote:Sorry: I just don't see the effect you describe. I just see the visual separation between the rings and the moon smoothly decreasing as the viewpoint gets closer to Enceladus. There is the differing background light due to the location of Saturn, but that's the only variation I see.


And I didn't even party last night. :?

Just for the record I'm using version 1.3.2.

I turned the stars off just in case but I still see it. I got out a ruler and, for me, the distance between the edge of Enceladus and the ring plane vary between 3 and 5 millimeters. I wish I could make a tracer of the image of Enceladus. I wouldn't even had been able to see this if it weren't for the edge on line of the ring plane.

Just for fun I turned on moon and planet orbit. Then I can see lots of movement. Its almost as though Enceladus was on a vibrating string.

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selden
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Post #51by selden » 09.04.2005, 17:51

I think I know what's going on.

It's the xyz trajectories.

To test this hypothesis, remove all of your addons from the Extras folder. Then use the URL and follow Enceladus again. (I'm assuming the trajectories are in data folders somewhere within the Extras folder, that you didn't put them in Celestia's Data folder and that you didn't edit Celestia's solarsys.ssc.)

My prediction is that you'll no longer see the jitter.

The coordinates used within Celestia for xyz trajectories are only single precision. I'm afraid that's not good enough when you're using heliocentric xyz trajectories as far away as Saturn.
Selden

Hoover
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Post #52by Hoover » 09.04.2005, 18:03

selden wrote:I think I know what's going on.

It's the xyz trajectories.

To test this hypothesis, remove all of your addons from the Extras folder. Then use the URL and follow Enceladus again. (I'm assuming the trajectories are in data folders somewhere within the Extras folder, that you didn't put them in Celestia's Data folder and that you didn't edit Celestia's solarsys.ssc.)

My prediction is that you'll no longer see the jitter.

The coordinates used within Celestia for xyz trajectories are only single precision. I'm afraid that's not good enough when you're using heliocentric xyz trajectories as far away as Saturn.


Ah ha! I can get rid of the jitter just by removing Cassini_Huygens_Landed_CMOD. But without that there is no Cassini in these flyby's either!

Are higher precisions a problem or in need of more computational power (i.e. in the future)?

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selden
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Post #53by selden » 09.04.2005, 18:15

My understanding is that Chris has been reluctant to change to double precision xyz trajectories because they'd use so much memory. It seems to me that memory usage could be kept to a reasonable amount if one could specify the precision of a particular trajectory, so it'd only be used when necessary.
Selden


VBSmiles
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Post #55by VBSmiles » 23.12.2005, 09:59

couldn't copy url code - 98 se user

Wanted to share this though :)
Found it just by accedent while traveling near 1998 KY26 with time warping lol.

"1998 KY26 With Borrelly" {
isFolder false
parentFolder ""
base [ 0.003267792483242459 -1.044971708799027e-007 -2.124367307255195e-005 ]
offset [ -1.965681849062928e-013 -4.607859233063394e-018 4.330845577993348e-016 ]
axis [ -0.126586 -0.985165 -0.115866 ]
angle 3.27099
time 2457200.634058418
selection "#0/1998 KY26"
coordsys "ecliptical"
}

Hoover
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Post #56by Hoover » 23.12.2005, 12:09

VBSmiles,

How do you put this into Celestia?

VBSmiles
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Post #57by VBSmiles » 23.12.2005, 21:11

Hoover wrote:VBSmiles,

How do you put this into Celestia?

You tell me, and we will both know LOL

Seriously. I opened the .cel and copied it from there , I don't know how to convert this into a link... But you can copy the text and paste it into a new txt file then save it as .cel ( it would then be a favorite )

Hoover
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Post #58by Hoover » 23.12.2005, 22:22

I figured it out. You have to edit your favorites.cel file and append it to the end.

VBSmiles
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Post #59by VBSmiles » 24.12.2005, 01:29

Hoover wrote:I figured it out. You have to edit your favorites.cel file and append it to the end.


doesn't help me create it as a link though :cry:

Hoover
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Post #60by Hoover » 24.12.2005, 01:47

Oh what was I thinking. It is the last line of the Controls Help. Either Ctrl+C or Ctrl+Insert will do it. It places the url in your clipboard, then you can place it on your address line in your browser to test it. Thus, your favorite becomes:

cel://Follow/Sol:1998 KY26/2015-06-27T03:13:06.57654?x=y6tDQFKb38rDDA&y=qiVj7FmwP+X//////////w&z=NR9BE2BgnsHq/////////w&ow=-0.064654&ox=-0.126321&oy=-0.983104&oz=-0.115624&select=Sol:1998 KY26&fov=35.847923&ts=1.000000&ltd=0&rf=39831&lm=0


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