Celestia Forums

Posted: **25.12.2010, 21:49**

I was remaking a video I made for YouTube, and I found a depth sorting bug:

depthsortbug.jpg

The Earth appears as if it's in front of Plutonium's rings, even though it's actually behind them:

depthsort2.jpg

Here's the SSC for Plutonium:

"Plutonium" "Sol" {
   Texture "saturn.jpg"
   Radius 32584.3794
   Mass 34.667264
   Oblateness 0.02

   Atmosphere {
      Height 320
      Lower [ 0.00 0.00 1.00 ]
      Upper [ 0.00 0.00 0.20 ]
      Sky [ 0.00 0.00 0.10 ]
      Mie 0.001
      MieAssymetry -0.30
      Rayleigh [ 0.001 0.0025 0.006 ]
      MieScaleHeight 20
   }

   EllipticalOrbit
   {
   Period       1000703.800
   SemiMajorAxis  10000.000
   Eccentricity       0.999990
   Inclination        0.00325 # 0.00325 makes it impact Earth, 0.30325 makes it pass Earth
   AscendingNode    180.000
   LongOfPericenter 121.29875 # 121.29875 makes it impact Earth, 121.09875 makes it pass Earth
        LongitudeNode      0.000
   Epoch        2457888.5000
   }

   RotationPeriod          18.000
   Obliquity               26.000
   EquatorAscendingNode   85.3000
   RotationOffset      226.4925

   Albedo           0.430

   Rings {
      Inner   40032.60
      Outer   96771.53
      Texture "saturn-rings.png"
   }
}

And the url for that location in Celestia:

cel://Follow/Sol:Earth:Moon/2017-06-15T ... rc=0&ver=3

Posted: **17.02.2011, 17:15**

Found another depth sorting bug.

Comet tail appears in front of earth, even though it is behind it, when comets get a certain distance away, determined by which computer you use.

depthproblem5.jpg

When I turn orbits on, the tail appears in front of the orbit, but not the planet.

depthproblem6.jpg

The comet that causes the problem:

dinokiller.zip

And the URL for the glitch: cel://Follow/Sol:Earth/2012-06-19T11:22 ... rc=0&ver=3

Do I need to post some sort of error log? If so which log, and how do I get that log?

Posted: **17.02.2011, 17:46**

This kind of bug doesn't generate any log entries. Celestia has always had problems depth sorting translucent objects

It might help to know which version of Celestia you're using. (1.6.0, 1.6.1, svn r????)
(sigs aren't always up to date; and when you update your sig after upgrading, it won't be right for this particular bug)

Posted: **17.02.2011, 19:02**

selden wrote:This kind of bug doesn't generate any log entries. Celestia has always had problems depth sorting translucent objects

It might help to know which version of Celestia you're using. (1.6.0, 1.6.1, svn r????)
(sigs aren't always up to date; and when you update your sig after upgrading, it won't be right for this particular bug)

Ok.

I was able to replicate both bugs on two laptops.

1st laptop: HP Pavilion dv6815m laptop, 1 GB NVIDIA Geforce Go 7150m graphics, 2 GHz AMD Turion 64 Mobile Tech TL-60 processor, 3 GB RAM, Windows Vista Home Premium 32 bit Service Pack 2. Celestia 1.6.0 official release.

2nd Laptop: HP HDX 16-1375DX laptop, NVIDIA GeForce GT 130M 1 GB shared graphics, Intel Centrino Core2 Duo P7550 @ 2.26 GHz and 2.27 GHz, 4 GB RAM, Windows Vista Home Premium 64 bit Service Pack 1. Celestia 1.6.0 official release.

On laptop 1, the comet tail bug starts when it is about 6 million KM away. On laptop 2, it starts when the comet is 2.5 KM away.

Does this help at least a little bit?

Posted: **17.02.2011, 21:37**

Well, I'm seeing the same problem on my system:

2GB 1.86GHz Core2Duo 6300; WinXP SP3 x32
256MB Nvidia NVS 290, Forceware v191.78
Celestia from svn r5136

so it is not yet "fixed in next release"

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