Celestia Forums

Posted: **29.12.2007, 00:48**

Celestia 1.5.0pre5 bug...

There seems to be a problem with binary stars. When in multitexture and basic mode, if you get at a certain angle, the flares become extremely amplified. I spotted this literally five minutes ago, as I've been working on an add-on to make the extrasolar systems with binary stars... binary, in Celestia. i.e. HD 147513 A and B actually orbit each other. It's somewhat hard to get into the right angle, and you must be a certian distance to notice the problem, so it may be difficult to reproduce the bug. Here's some screen shots showing HD 89744 (is binary for the add-on I am making, but not in default Celestia) and Alpha Centauri (which is binary in Celestia). I am unable to replicate the problem for HD 41004 A/B, or for HD 65216 A/B. The issue exists in all three star modes--Fuzzy points, points, scaled disks, and also exists with auto-mag on and off.

I am tempted to say that I like this bug, but it isn't consistent in that the hyper-flare disappears once you're within a certian distance. And after all, it is a bug. So it must be fixed.

Posted: **29.12.2007, 01:13**

Unfortunately, I am unable to reproduce your problem.

Can you provide a Cel:// URL for the failing viewpoint?

Posted: **29.12.2007, 01:20**

selden wrote:Unfortunately, I am unable to reproduce your problem.

Can you provide a Cel:// URL for the failing viewpoint?

Well, that would be nice, Selden, but Cel:// doesn't work in 1.5 Pre5
either. :wink:

Unless, of course, I'm doing something stupid again. But, I believe
that others have noticed this as well. Just FYI.

Thanks, Bob

Posted: **29.12.2007, 01:33**

I think that Toti has already fixed this bug in the CVS version.

--Chris

Posted: **29.12.2007, 01:37**

Chris,

The smptoms and necessary conditions that I had were quite different, although it might be the same problem.

Bob,

Cel:// URLs work fine for me. Type Ctrl-C.
and Celestia says
Copied URL

Select another window, type a Ctrl-V and it pastes this:
cel://Follow/Rigel Kentaurus A/2007-12-29T01:41:18.54281?x=AAAAToVwkRXqGuf//////w&y=AAAYEaBS+Z+Q69L//////w&z=AADYYQfGhJc/QCo&ow=0.671608&ox=-0.122709&oy=0.077898&oz=0.726510&select=Rigel Kentaurus A&fov=23.793573&ts=1.000000&ltd=0&p=0&rf=2102759&lm=2048&ver=2

Posted: **29.12.2007, 01:41**

Bob,

I just remembered that you said you'd installed Celestia yet again.

Did you remember to check the box "associate URLs" during the installation?

Posted: **29.12.2007, 18:59**

Be sure to set mode to Basic or Multitexture. Also, I have realised that screen size affects it. All of these are taken with Celestia in maximized mode, with a screen resolution of 1280 x 800

Here's a few examples. You'll need to make an .STC file with modified star attributes for the last two. I've included those below (Caution, they will alter planet-host stars, making your planets orbit a barycentre rather than the star).

cel://Follow/Rigel Kentaurus/2007-12-29T18:53:12.00739?x=AACobR9mFgPCGuf//////w&y=AABgLZ0KrsmN69L//////w&z=AACA5RXVnMpgQCo&ow=-0.750386&ox=-0.016815&oy=-0.203284&oz=0.628740&select=Rigel Kentaurus&fov=26.931641&ts=1.000000&ltd=0&p=0&rf=2119603&lm=0&ver=2
cel://Follow/HD 109749 A/2007-12-29T19:00:06.04880?x=AAA4gC4mBfQFM978/////w&y=AIDECf+c0QJZjkz7/////w&z=AADrMyAYj673v8oB&ow=-0.994687&ox=-0.029973&oy=-0.097905&oz=0.010681&select=HD 109749 A&fov=26.931641&ts=1.000000&ltd=0&p=0&rf=2119603&lm=0&ver=2
cel://Follow/HD 65216 A/2007-12-29T19:00:38.32587?x=AACgA4qgeW48+4n+/////w&y=AAAjma9JHPp7uj35/////w&z=AAAG2wBiCCUI7fz//////w&ow=0.108366&ox=-0.739625&oy=0.454451&oz=0.484443&select=HD 65216 A&fov=26.931641&ts=1.000000&ltd=0&p=0&rf=2119603&lm=0&ver=2

Code: Select all

# HD 109749 A/B
Barycenter 61595 "HD 109749"
{
RA        175.8754646
Dec       -58.0068869
Distance  99.4206
}
 
   "HD 109749 A"   # Planet host star.
   {
   OrbitBarycenter "HD 109749"
   SpectralType "G3V"
   AppMag  8.18

          EllipticalOrbit {
                      Period                  85982
                   SemiMajorAxis           1069.44444
                     Eccentricity            0.5 # Plausable guess, typical of most binary stars.
                ArgOfPericenter          180
                   MeanAnomaly             0
                }
   }

   "HD 109749 B"
   {
   OrbitBarycenter "HD 109749"
   SpectralType "M3V"
   AppMag 10.76 

           EllipticalOrbit {                
         Period                  85982
                   SemiMajorAxis          1130.55556
                   Eccentricity            0.5 # Plausable guess, typical of most binary stars.
                   MeanAnomaly             0
           }
   }



# HD 65216 A/BA/BB
Barycenter 38558 "HD 65216"
{
RA         118.4221763
Dec        -63.6473231
Distance   116.0142
}

   Barycenter "HD 65216 B"
   {
      OrbitBarycenter "HD 65216"

      EllipticalOrbit {
         Period          3859.42252
         SemiMajorAxis   214.130635
         Eccentricity    0.5    # Plausable guess.
         Inclination   0
         AscendingNode   0
         ArgOfPericenter 0
      }
   }

      "HD 65216 BA"
      {
      OrbitBarycenter "HD 65216 B"
      SpectralType "L0V"
      AppMag  21 # Guess

             EllipticalOrbit {
                         Period                  35.9604367
                      SemiMajorAxis           2.80239521
                         Eccentricity            0.5 # Plausable guess.
                   ArgOfPericenter          180
                      MeanAnomaly             0
                }
      }


      "HD 65216 BB"
      {
      OrbitBarycenter "HD 65216 B"
      SpectralType "M8V" # M7.5V
      AppMag  18 # Guess.

             EllipticalOrbit {
                         Period                  35.9604367
                      SemiMajorAxis           3.19760479
                         Eccentricity            0.5 # Plausable guess.
                   ArgOfPericenter          0
                      MeanAnomaly             0
                }
      }

   "HD 65216 A" # Planet host star.
   {
   OrbitBarycenter "HD 65216"
   SpectralType "G5V"
   AppMag  7.97

          EllipticalOrbit {
                      Period                  3859.42252
                   SemiMajorAxis           38.8693652
                     Eccentricity            0.5 # Plausable guess.
                ArgOfPericenter          180
                   MeanAnomaly             0
                }
   }

Posted: **29.12.2007, 19:57**

I am unable to replicate this bug with current CVS version. But I reproduced it with a previous version (slightly older than pre5).

I think this is another manifestation of this bug. It would be great if other people could confirm.

Posted: **29.12.2007, 20:36**

selden wrote:Bob,

I just remembered that you said you'd installed Celestia yet again.

Did you remember to check the box "associate URLs" during the installation?

Yes, I did Selden, but I still have trouble with this for some reason.
Not important though... I rarely - if ever - use this feature. The only
reason I tried to use it lately was so that some of the VT's I've been
playing with could be tested. They (a lot of them) include a CEL
pointer in order to view the appropriate close-up area.

No big deal, since I can easily find these areas in other ways.
Thanks, Bob

Celestia Forums

Flare issue on Basic and Multitexture mode

Flare issue on Basic and Multitexture mode