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Telesto 3d CMOD model

Posted: 20.09.2009, 22:58
by Fenerit
Inspired by the work of John v. Vliet upon Phobos, I tried to render in CMOD format the Saturn moon Telesto.
The mesh has been modelled following this Cassini images:

http://www.planetary.org/data/cassini/rocks/#telesto

The texture is both real, fictional and LOK. The moon look in Celestia as below:

Image

Image

To achieve this similitude is required more ambient light than zero.


For whom is interested, the download link is below:

http://marauder.webng.com/files/telesto_cmod.zip
An .OBJ model of the moon is included.

Re: Telesto 3d CMOD model

Posted: 21.09.2009, 13:19
by Fenerit
Previous link has been updated. Telesto.cmod was in wrong orientation. I apologize for the inconvenience.

Re: Telesto 3d CMOD model

Posted: 21.09.2009, 14:29
by danielj
Good,anyone doing the same with other minor moons of Saturn?

Re: Telesto 3d CMOD model

Posted: 21.09.2009, 15:31
by danielj
Putting in the root didn?t work.I had to create the folder Telesto inside extras and put the files in the correspondent sub folders med res and models.Then IT WORKED.Also,the lok texture is lacking...
One important thing:I used Celestia SVN.I use Windows Vista and the operational system didn?t let me change any config inisde Program Files.

Re: Telesto 3d CMOD model

Posted: 21.09.2009, 18:52
by volcanopele
Incredible job, Fenerit, downloading the file now.

Like danielj, I would love to see additional Saturnian moon if you or other modelers have the time. If I had a recommendation for which moon to work on first, I would recommend Helene. Cassini will flyby thistrojan satellite sharing Dione's orbit in March 2010 and it would be great to have a model of Helene for this event. I have a full set of Cassini images of Helene that could be useful for any modelers.

Re: Telesto 3d CMOD model

Posted: 21.09.2009, 19:35
by t00fri
Nice!

works fine for me...

Fridger

Re: Telesto 3d CMOD model

Posted: 21.09.2009, 19:46
by John Van Vliet
--- edit ---

Re: Telesto 3d CMOD model

Posted: 21.09.2009, 19:58
by t00fri
john Van Vliet wrote:nice , and things are comming along.i have been busy the last few days
a few links , but most of you here will know about them
http://www.psi.edu/pds/
http://www.psi.edu/pds/asteroid/EAR_A_5 ... V2_1/data/

Sure enough ;-)

F.

Re: Telesto 3d CMOD model

Posted: 21.09.2009, 20:18
by volcanopele
Just tested it out. I got it displaying in Celestia, but the orientation is wrong, and I can seem to find the write Orientation statement to get it to work. Orientation [ 90 1 0 0 ] gets the north pole right. However, in this case, the leading hemisphere (shown in Fenerit's first image above) mistakenly points to Saturn.

Telesto_model_test_axes.jpg

In the attached image, the Z axis points correctly, but the two equatorial axes, X and Y do not point correctly, so the model is not oriented properly. With the Z (blue) axis where it is, the equatoral axes should be rotated 90 degrees to the right, with the X (red) axis pointing to the sub-Saturn point (0 W) and the Y (green axis) point to the center of the trailing hemisphere (270 W). So the big crater in the first image posted by Fenerit shows the leading hemisphere and the second image shows predominately the trailing hemisphere.

Telesto_montage.jpg

In the second attached image, I show some images from Cassini from Rev16 and Rev19. These images show predominately the trailing and anti-Saturn hemispheres of Telesto. One possible addition to the model could be the impact crater at around 220W near the equator (near the right side of Fenerit's second image and along the terminator in the bottom right two images in my montage).

Re: Telesto 3d CMOD model

Posted: 21.09.2009, 23:37
by Fenerit
Thanks for yours feedbacks. 8)

Volcanopele, the wrong orientation of which you speak is after the correction? Because the first image is surely wrong, but is referred to my first misorentation, I've not corrected the image yet, sorry. The update might be properly oriented.

Danielj, it might work; although modify_telesto.ssc may be not in ..\data

John, your links are interesting but I'm not sure how to read that formats. Whether you cortesely point me to some hints...

Re: Telesto 3d CMOD model

Posted: 22.09.2009, 00:11
by volcanopele
Yes, I just downloaded this file again and I am still seeing the same mis-orientation.

Re: Telesto 3d CMOD model

Posted: 22.09.2009, 00:19
by Fenerit
Arg! What I have done? :cry: Now is time to sleep. Tomorrow I will check the modeller's scene.

Re: Telesto 3d CMOD model

Posted: 22.09.2009, 05:48
by Fenerit
Volcanopele, please, could you test this orientation? This is the model on my system and it has the leading trail within LOK. I wonder whether in zipping I put an intemediate file (shell integration often does play ugly jokes).

http://marauder.webng.com/files/telesto_orient.zip 484 kb

Re: Telesto 3d CMOD model

Posted: 22.09.2009, 06:41
by volcanopele
Yep, that orientation works just fine on my system :)

Re: Telesto 3d CMOD model

Posted: 22.09.2009, 07:24
by volcanopele
The attached image compares the model to the three main Cassini views from Rev16 (October 11, 2005), Rev19 (December 25, 2005), and Rev117 (August 27, 2009). Some differences seem to result from assumptions that the two main views used to generate this model (Rev16 and Rev117) were centered over the equator, so the simulated views seem to be looking further to the south in the Rev16 shot from Celestia and further to the north in the Rev117 shot.

Celestia_Real_comparison.jpg


Some data for these three views:

Rev16 - Distance to center=9852.9187 km; October 11, 2005 20:21:04.410; 0.0587 km/pixel; Sub-Cassini Latitude and longitude: 20.867 South, 260.505 West
Rev19 - Distance to center=19809.552 km; December 25, 2005 00:31:16.340; 0.1181 km/pixel; Sub-Cassini Latitude and longitude: 3.834 South, 254.302 West
Rev117 - Distance to center=35987.635 km; August 27, 2009 14:28:09.560; 0.2155 km/pixel (magnified 2x in attached image); Sub-Cassini Latitude and longitude: 13.965 North, 97.047 West

In general, in addition to the changes to correct for the differences in the assumed sub-spacecraft latitude and the predicted one, it looks like the big, leading hemisphere crater seen in the Rev117 comparison could be moved about 7 degrees to the east. The features seen in Rev16 and Rev19 on the trailing hemisphere could be moved a bit to the west, maybe ~5-10 degrees.

Re: Telesto 3d CMOD model

Posted: 22.09.2009, 11:53
by Fenerit
Could all this to be related to the famous "at epoch" data? Effectively, the direction of Sun's light in the Cassini images suggest a different angle.

Re: Telesto 3d CMOD model

Posted: 22.09.2009, 12:10
by Fenerit
Anyhow, now I change the way to model this moon. Some ideas come to my (bad) brain...

Re: Telesto 3d CMOD model

Posted: 22.09.2009, 21:58
by Fenerit
Volcanopele, as you have suggested, I've built a new model diversely oriented. The result is below (the Cassini's images are reds). The strange thing are the first two above: they are "compressed" while the last bound pretty well. If I compress the shape as in the first two, the last would be completely different.

Image

http://marauder.webng.com/files/telesto_new_or.zip 2.14 Mb
The new texture is manual painted, sorry.

Re: Telesto 3d CMOD model

Posted: 09.10.2009, 15:06
by duds26
I remember someone who made a piece of software that can generate 3d (could be normalmap, not sure) from 3 images of an object with different lightning.