Test Pics - Asteroid belt of HD 69830
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Topic authorJohn Whatmough
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Test Pics - Asteroid belt of HD 69830
Hi there!
I run the Extrasolar Visions site which I have been gradually updating to reflect more recent research and discoveries. About six months ago I started using Celestia as my primary rendering tool as it takes care of most of the calculations and is specifically designed for rendering planets.
Anyway, I've been toying with rendering the asteroid belt of HD 69830 and have come up with this prototype...
Is this convincing? I'm attempting something along the lines of the image that was put together by NASA... http://www.spitzer.caltech.edu/Media/re ... -10c.shtml
-John
I run the Extrasolar Visions site which I have been gradually updating to reflect more recent research and discoveries. About six months ago I started using Celestia as my primary rendering tool as it takes care of most of the calculations and is specifically designed for rendering planets.
Anyway, I've been toying with rendering the asteroid belt of HD 69830 and have come up with this prototype...
Is this convincing? I'm attempting something along the lines of the image that was put together by NASA... http://www.spitzer.caltech.edu/Media/re ... -10c.shtml
-John
John Whatmough
Extrasolar Visions - http://www.extrasolar.net
Extrasolar Visions - http://www.extrasolar.net
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Topic authorJohn Whatmough
- Posts: 3
- Joined: 26.05.2005
- With us: 19 years 5 months
- Location: New Hampshire, USA
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Topic authorJohn Whatmough
- Posts: 3
- Joined: 26.05.2005
- With us: 19 years 5 months
- Location: New Hampshire, USA
Hadn't thought of that, but wouldn't modifying flare.jpg affect all stars? Is there a way to set a flare style for a specific star?
Also, I neglected to mention the technique I used to get this effect...
Basically, the belt is a combination of three "planets", each with a zero orbit that puts them inside the star. The first has a giant ring that extends 100,000,000 km. The second is highly oblate and has a atmosphere height the same value as the ring width. The third is the same as the second, only less oblate and smaller. The actual radius of each "planet" is ~600000 km, so the "planets" themselves are hidden inside the star. And, of course, the radius of each is slightly different than the others to prevent them from "blinking".
Only flaw so far is that you have to turn off ring shadows. Otherwise the "planets" cast a long thin shadow on the ring. You can make the ring emissive, but then you get an odd brightness gradient across the ring. I've toyed with using a null mesh to remove the planet shadow, but this tends to crash the program.
Also, zooming in on the star penetrates the atmospheres, so you'll get the same kind of blinking and odd effects as when you get too close to a planet with an atmosphere, only more so because there are two atmospheres overlapping.
-John
Also, I neglected to mention the technique I used to get this effect...
Basically, the belt is a combination of three "planets", each with a zero orbit that puts them inside the star. The first has a giant ring that extends 100,000,000 km. The second is highly oblate and has a atmosphere height the same value as the ring width. The third is the same as the second, only less oblate and smaller. The actual radius of each "planet" is ~600000 km, so the "planets" themselves are hidden inside the star. And, of course, the radius of each is slightly different than the others to prevent them from "blinking".
Only flaw so far is that you have to turn off ring shadows. Otherwise the "planets" cast a long thin shadow on the ring. You can make the ring emissive, but then you get an odd brightness gradient across the ring. I've toyed with using a null mesh to remove the planet shadow, but this tends to crash the program.
Also, zooming in on the star penetrates the atmospheres, so you'll get the same kind of blinking and odd effects as when you get too close to a planet with an atmosphere, only more so because there are two atmospheres overlapping.
-John
Yes, modifying flare.jpg would modify the appearance of all stars. My suggestion was more for generating specific artwork.
A more general possibility might be to create a 3D model of the right shape and transparency and define it as a planet with an SMA of 0 and Period of 1e32 so that it extends around the star.
Another would be to define an appropriate cloud texture around that fake planet.
If you use Celestia v1.4.0pre6, you can use a 3D model as a Mesh for the star itself. Unfortunately, Celestia seems always to draw stars as an opaque light source; maybe a future version of Celestia will be able to show translucent coronal effects and haze like this.
A more general possibility might be to create a 3D model of the right shape and transparency and define it as a planet with an SMA of 0 and Period of 1e32 so that it extends around the star.
Another would be to define an appropriate cloud texture around that fake planet.
If you use Celestia v1.4.0pre6, you can use a 3D model as a Mesh for the star itself. Unfortunately, Celestia seems always to draw stars as an opaque light source; maybe a future version of Celestia will be able to show translucent coronal effects and haze like this.
Selden
In the Physics & Astronomy Section I wrote:Posted: Thu Apr 21, 2005 5:17 pm
Post subject: Spitzer Detects a Possible Alien Asteroid Belt.
I received an interesting e-mail from NASA news yesterday. Here's a link to the story on the main Spitzer website;
http://www.spitzer.caltech.edu/Media/re ... ease.shtml
Maybe there is some potential here for a future Celestia add-on ?
John,
Thank you for trying to add this interesting recent discovery to Celestia.
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:
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John Whatmough wrote:...The first has a giant ring that extends 100,000,000 km. The second is highly oblate and has a atmosphere height the same value as the ring width. The third is the same as the second, only less oblate and smaller....
As Selden, I think a 3D model of disk can solve the problem of ring shadows...
John:
The effect is spectacular. I am anxiously awaiting the add-on. I would like to use it in Celestia's educational activities, which I write and maintain for use by teachers around the world.
In particular, will the disk haze have some sense of debris in it (simulating nebula rubble coming together to form asteroids and accretions?) In other words, as an asteroid belt, it would be great to also see some asteroids inbedded in the disk/haze layers. Is that possible?
Anyway, looking forward expectantly to the add-on.
Frank G
The effect is spectacular. I am anxiously awaiting the add-on. I would like to use it in Celestia's educational activities, which I write and maintain for use by teachers around the world.
In particular, will the disk haze have some sense of debris in it (simulating nebula rubble coming together to form asteroids and accretions?) In other words, as an asteroid belt, it would be great to also see some asteroids inbedded in the disk/haze layers. Is that possible?
Anyway, looking forward expectantly to the add-on.
Frank G
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any advancement on this add-on yet, I have been keeping my eye on this for a while now
looks fantastic
looks fantastic
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RAM- 2Gb 1066MHz DDR2
Motherboard- Gigabyte P35 DQ6
Video Card- Nvidia GeForce 8800 GTS + 640Mb
Hard Drives- 2 SATA Raptor 10000rpm 150GB
OS- Windows Vista Home Premium 32
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The Asteroid Belt Is Art!
John,
Big fan of your website! Love your ARTWORK! I often reference your site to get ideas of how Planets and Stars might look up-close and personal. I understand your artwork is consistant with astronomical standards. Wow, the thought of the possibility that you (A noted artist) might make textures for Celestia is exhilarating. I especially enjoy your Brown Dwarf concepts!
Post Script: Amazing effect with that ateroid belt!
I stand in the shadow of GREATNESS!
Big fan of your website! Love your ARTWORK! I often reference your site to get ideas of how Planets and Stars might look up-close and personal. I understand your artwork is consistant with astronomical standards. Wow, the thought of the possibility that you (A noted artist) might make textures for Celestia is exhilarating. I especially enjoy your Brown Dwarf concepts!
Post Script: Amazing effect with that ateroid belt!
I stand in the shadow of GREATNESS!
Hi guys. Listen, they're telling me the uh,
generators won't take it, the ship is breaking apart and all that. Just, FYI.
(Athlon X2 6000+ Dual Core 3Ghz, 8GB DDR2-800, 500GB SATA 7200RPM HD, 580W,
GeForce 9600GT-512, 64Bit, Vista Home Premium)
generators won't take it, the ship is breaking apart and all that. Just, FYI.
(Athlon X2 6000+ Dual Core 3Ghz, 8GB DDR2-800, 500GB SATA 7200RPM HD, 580W,
GeForce 9600GT-512, 64Bit, Vista Home Premium)
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About the Artist
Google Images
EXTRASOLAR VISIONS
THE ACCOUNTS OF THYRENACIA
The Union Leader and New Hampshire Sunday News
Posted: Thu Sep 15, 2005 2:21 am Post subject: A Terribly Sad Announcement
Posted: Fri Sep 16, 2005 12:57 pm Post subject: John Whatmough
Vita brevis, ars longa, Occasio praeceps, Experimentum periculosum, Iudicium difficile.
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If anyone has possibility of contact with the family, I think I can speak for the whole Celestia community in this case when I say it is a tragic loss and we send our condolences.
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WinXP Pro SP2
Asus A7N8X-E Deluxe
AMD Athlon XP 3000/333 2.16 GHz
1 GB Crucial RAM
80 GB WD SATA drive
ATI AIW 9600XT 128M
I sent an email to a close friend of his who made the official announcement in the extrasolar visions forum. Along with a few others who did likewise, I think we've conveyed just how much of an impact both his life and his passing has made on the 'Net and, I daresay, off of it as well.
...John...
...John...
"To make an apple pie from scratch, you must first create the universe..."
--Carl Sagan
--Carl Sagan
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A GREAT LOSS!
What a tremendous loss to the Astronomical community! An irreplaceable asset! He's a hero who was trying to save his own son! "No greater love hath any man than, to lay down his life for his friends." He will be sadly missed by us all. My sincerest condolences to his family! I really don't know what to say, I'm shocked and deeply saddened.
Hi guys. Listen, they're telling me the uh,
generators won't take it, the ship is breaking apart and all that. Just, FYI.
(Athlon X2 6000+ Dual Core 3Ghz, 8GB DDR2-800, 500GB SATA 7200RPM HD, 580W,
GeForce 9600GT-512, 64Bit, Vista Home Premium)
generators won't take it, the ship is breaking apart and all that. Just, FYI.
(Athlon X2 6000+ Dual Core 3Ghz, 8GB DDR2-800, 500GB SATA 7200RPM HD, 580W,
GeForce 9600GT-512, 64Bit, Vista Home Premium)