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PostPosted: Sat, 29-12-07, 14:52 GMT 
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It would be a pity to loose time when those models are already available...


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PostPosted: Sun, 30-12-07, 18:07 GMT 
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ElChristou wrote:
It would be a pity to loose time when those models are already available...


I am working through the enormous, messy original 3ds file, which i finally managed to get into Cheetah 4x. I am extracting the rocket meshes, which is a very tiny part of the entire mess, and quite salvageable (it is the messy Buran version in there that bogs everything down; the rocket is just a few hundred Kb compared to a 14 meg total in 3ds format).

Right now:
Image

- rthorvald


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PostPosted: Sun, 30-12-07, 22:53 GMT 
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Some preliminary shots; very raw, no texturing or smoothing yet, but the model is a mere 650 kilobytes 3ds. There will not be much more geometry, details will be added via texture mapping, exept for some transparency on the windows to get a 3D feel for the cockpit.

(The wheels are out in this test, which it won´t have at this altitude)...

(click for full size):
Image
Image
Image
Image

Next phase is to mount it on the Energia.

- rthorvald


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PostPosted: Mon, 31-12-07, 1:00 GMT 
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Nice!

Are you sure you want to merge both models? why not using a reference frame declaration to fix the shuttle on the rocket?


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PostPosted: Mon, 31-12-07, 1:05 GMT 
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ElChristou wrote:
Nice!

Are you sure you want to merge both models? why not using a reference frame declaration to fix the shuttle on the rocket?

That is exactly what i will do; it must exist in a number of configurations:
- Mounted on the rocket
- Separated, wheels in
- Separated, wheels out
- Separated, wheels out, parachute for braking
... And also the smoke and exhaust for the rocket. So there will be a series of separate models connected only in the SSC, with different beginning/ending dates.

The rocket(s) seems to end up at about the same poly size as the ship, so it ought to become a fairly workable package in Celestia...

- rthorvald


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PostPosted: Mon, 31-12-07, 1:17 GMT 
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Ahh exaust smoke... Could never get something nice for the stack...


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PostPosted: Fri, 04-01-08, 9:57 GMT 
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Since the Energia/Burans single flight took off from Baikonur, it shares the location with Linuxm@ns detailed Baikonur model. So i placed the ship on one of his platforms...

It is of course not the right support tower for this ship, but it makes an interesting backdrop nevertheless, and it is there already...

Here, the Buran/Energia is still missing the Zenit Boosters, as Chris is working on them, and the models are as yet not texturized. But it is a nice picture (click to enlarge):

Image

- rthorvald


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PostPosted: Fri, 04-01-08, 10:25 GMT 
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Oh my! That's super... looking forward to it.


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PostPosted: Tue, 08-01-08, 16:26 GMT 
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I have a preliminary orbit.
The trajectory is an approximation; i have plotted it by hand, with 1-minute intervals for the landing and takeoff, and 5-minute intervals for the two orbits of the Earth. I don´t believe i am able to do it more detailed than this, but there must be more fine-tuning of the landing and takeoff.

Velocity and altitude is very roughly correct, as the inaccuracies i get in Celestia writing it, makes it extremely difficult to project the path in more detail. This is particularily evident on the last leg from South America, over the Atlantic and down to Baikonur; i would need a lot more information and plot points to do better detail than this. Example: the ship changes orbit a couple of times, with minor variations in altitude and inclination - this is reflected here, but the transitions and variations are very coarse, and the inclination of each orbit is far from exact, as the changes happens to often to be depicted meaningfully in Celestia - at least with the number of data points it is feasible to do by hand.

Anyway, the timing of each leg is pretty accurate apart from the actual landing, which is a bit wobbly:. There is also some kind of weird "pirouette" in the air in the final minutes that i have managed to minimize but not remove - at the cost of a slower approach in the final minute than it should have...

If anybody are up to it, have a look... Here it is:

Note: you need the SSC, since the XYZ origin is the Baikonur airfield rather than the Earth:

SSC: substitute the Energia declaration with something at hand):
Code:
"Baikonur" "Sol/Earth" {
   LongLat [63.31015 45.79536 0.047]
   Class "spacecraft"
   Mesh "th_placeholder.cmod"
   Radius 1
   Albedo            0.01
   }

"Buran Flight" "Sol/Earth/Baikonur" {
   LongLat [63.31015 45.79536 0.047]
   Class "spacecraft"
   Mesh "energia-buran.3ds"
   Radius 0.031      # WITH ENERGIA = 0.058765
   Beginning   2447480.62566
   # Ending   2447480.76802
   Albedo            0.5
   Orientation       [ 168.4 1.05 0.469 0.673 ]
   SampledOrbit   "th_buranflight.xyz"
   }

"Point of touchdown" "Sol/Earth" {
   LongLat          [   63.275   45.8088    0.002 ]
   Class "spacecraft"
   Mesh "th_placeholder.cmod"
   Radius 0.001
   Albedo            0.5
   }


XYZ:
Code:
2447480.62566   0   0      0
2447480.62701   -104   -109      90
2447480.62948   -630   -1965.0      -312.0
2447480.63098   -664   -3250.0      -867.0
2447480.63373   -485   -4575.0      -1606.0
2447480.6372   215   -5898.0      -2861.0
2447480.64067   1297   -6772.0      -4275.0
2447480.64414   2652   -7102.0      -5713.0
2447480.64762   4172   -6852.0      -7048.0
2447480.65109   5702   -6037.0      -8153.0
2447480.65456   7114   -4719.0      -8927.0
2447480.65803   8274   -3012.0      -9302.0
2447480.6615   9078   -1067.0      -9242.0
2447480.66498   9452   951.0      -8746.0
2447480.66845   9358   2859.0      -7869.0
2447480.67192   8810   4489.0      -6683.0
2447480.67539   7854   5703.0      -5306.0
2447480.67887   6580   6397.0      -3856.0
2447480.68234   5111   6515.0      -2476.0
2447480.68581   3573   6055.0      -1289.0
2447480.68928   2115   5068.0      -405.0
2447480.69275   867   3657.0      93.0
2447480.69623   -58   1953.0      163.0
2447480.6997   -570   134.0      -207.0

2447480.70317   -630   -1627.0      -980.0
2447480.70664   -233   -3162.0      -2081.0
2447480.71012   588   -4322.0      -3415.0
2447480.71359   1747   -4986.0      -4854.0
2447480.71706   3141   -5088.0      -6264.0
2447480.72053   4635   -4611.0      -7522.0
2447480.724   6094   -3587.0      -8508.0
2447480.72748   7379   -2102.0      -9130.0
2447480.73095   8363   -284.0      -9332.0
2447480.73442   8960   1701.0      -9094.0
2447480.73789   9013   3653.0      -8369.0
2447480.74137   8677   5417.0      -7362.0
2447480.74484   7915   6835.0      -6106.0
2447480.74623   6929   7661.0      -4936.0
2447480.74831   5790   7991.0      -2870.0
2447480.75178   4689   7571.0      -1296.0
2447480.75525   3518   6727.0      -21.0
2447480.75873   2371   5417.0      833.5
2447480.76081      967   3066.0      1310.0
2447480.7625      400   1662.0      870.0
2447480.76359      115   353.0      309.0
2447480.76458      91   196.0      199.0
2447480.76493      51   86.0      110.0
2447480.76624      0.2   11.5      8.7

2447480.7665      0.45   6.99      5.2

2447480.7673      -0.2   4.99      2.7
2447480.76797      -0.61   2.99      1.096
2447480.76936      -1.75   -0.19      -1.56


And here is all the info i have on the flight, if anyone is interested:
Quote:
Timeline
-------------------

2447457.5 october 23, 1988 Buran on launch platform

november 15, 1988:
----------------------------------------------------------------------
2447480.61944 02:52 GMT core stage main engines start
2447480.62014 02:53 GMT zenit boosters start
2447480.625 03:00 GMT Launch
2447480.62691 03:02:45 Zenits jettisoned (in pairs), 60 km altitude
Apogee of 154,2 km, temporary orbit
2447480.63056 03:08:00 Energia separation, 160 km altitude

(The trajectory of the booster and orbiter descending into the
atmosphere over the Pacific)

2447480.63229 03:10:30 Buran fired orbital maneuvering engines for 67 seconds, boosting trajectory higher
2447480.63307 03:11:37 Engines shutdown, 250 km altitude. Entered a 251 km x 263 km orbit of the earth
2447480.65764 03:47:00 fired engines again for 42 seconds Over the Pacific, circularizing the orbit to 252 * 256 km
2447480.65812 03:47:42 Engines shutdown, 256 km altitude, circular orbit
2447480.72222 05:20:00 Buran turns, tail in direction of flight, retrofire. Over the South Pacific. Delta-v of 175 m/s
[ 2447480.72334 05:21:37 ] Engine shutdown, shuttle turns again, nose in direction of flight, going for reentry.

[20 minutes forward] Touches atmosphere at 122 km altitude
[ 2447480.73723 05:41:37 ] Aerobraking: plasma shield under the spacecraft
40 km altitude: turning Eastward by 1000 km, towards Baikonur

2447480.76736 06:25:00 Touchdown in Baikonur, 207 mph.
Three parachutes deployed for braking. Stopped after 1150 meters.

Total flight time: 206 minutes, 2 orbits of the Earth.



- rthorvald

PS:
Many thanks to Andrea, for digging up the data i based this on!


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PostPosted: Thu, 10-01-08, 15:33 GMT 
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Next step, the Zenit Boosters;
After i assembled and cleaned them up, Chris did a great job in optimizing the meshes - reducing the poly count by 75% without reducing the visual appearance.

After that, i added the rigging (the wires and beams that straps it onto the Energia and each other, and some detail that is unique to each of the four.

Now i am in the process of texture-mapping the rockets; a detail of an engine is seen below.
(click to enlarge):
Image

- rthorvald


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PostPosted: Thu, 10-01-08, 16:41 GMT 
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Wow!
It grows better and better, well done to both of you. :wink:
Bye

Andrea :D

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PostPosted: Thu, 10-01-08, 22:20 GMT 
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Runar, I was thinking about the texturing of the inner side of the thrusters; what about 3 versions, the one here (before take off), one with a blue/white texture to simulate combustion (would need flame models) and one almost black/blue when thrusters are off... what do you think?


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PostPosted: Thu, 10-01-08, 22:45 GMT 
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ElChristou wrote:
Runar, I was thinking about the texturing of the inner side of the thrusters; what about 3 versions, the one here (before take off), one with a blue/white texture to simulate combustion (would need flame models) and one almost black/blue when thrusters are off... what do you think?


I already have the graphics for it, from a rocket launch in Ran, and had planned on modifying those for this use :-)

I also have realistic smoke for a takeoff plume. But it is extremely large (in polygon count), so i am going to try to produce smaller versions - it is smoke i developed for the volcano in Off on a Comet, but never used since it was too big. But today i know more... Perhaps. Here´s a shot of the smoke before i removed it from that add-on:
http://www.celestialmatters.org/users/r ... olcano.jpg

- Runar


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PostPosted: Thu, 10-01-08, 23:35 GMT 
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About half-way through the modelling work, here´s a screenshot taken five seconds after blast-off from Baikonur (click to enlarge):

Image
... No exhaust yet, but it will be there...

- rthorvald


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PostPosted: Thu, 10-01-08, 23:55 GMT 
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rthorvald wrote:
I also have realistic smoke for a takeoff plume. But it is extremely large (in polygon count), so i am going to try to produce smaller versions - it is smoke i developed for the volcano in Off on a Comet, but never used since it was too big. But today i know more... Perhaps. Here´s a shot of the smoke before i removed it from that add-on:
...


Seems pretty nice but hard to tell how it is done... Any wireframe?


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