Problems with 1.5.0pre5

[Derek]

Hi,

A newbie having problems with 1.5.0pre5:

1. The ongoing cloudshadow problem, in 1.4.1 it worked fine, but I'm confused how to apply it in 1.5.0pre5
if it is as 1.4.1 then why the tickbox for cloudshadows, otherwise I've missed something.

2. using Open2.0GL I find that white or light moons such as Enceladus or Europa are actually washed out and no detail
can be seen. Any suggestions as to the problem.

3.Using the addon for Pluo's moons Nix and Hydra with the orbits switched on the "orbits are shown" but the moons are
orbiting on a plane 90degrees to the orbits. This addon worked perfectly on 1.4.1.

[selden]

#1: It's being worked on.

#2: The moons look the same on my system using either v1.5.0pre5 or v1.4.1 final. Check your ambient light setting. I suspect it has been turned up. Those moons look fine to me when the ambient light level is set to 0. Type { and } to change it (shift-[ and shift-]).

#3: Yup, you're right, but...
that's a defect in the now-obsolete Nix-Hydra Addon triggering a bug in Celestia.

The Nix-Hydra Addon needs to be modified so it'll work correctly with the new orbital definition for the Pluto-Charon system. The moons should be orbiting around the barycenter of the Pluto-Charon system, not around Pluto. Change the lines
"Hydra" "Sol/Pluto" # (IAUC 8625)
and
"Nix" "Sol/Pluto" # (IAUC 8625)
so they look like
"Hydra" "Sol/Pluto-Charon" # (IAUC 8625)
and
"Nix" "Sol/Pluto-Charon" # (IAUC 8625)
Then the orbital paths will be drawn correctly.

But here are fully updated parameters obtained from Horizons just now:

Code: Select all

#    JDCT     Epoch Julian Date, Coordinate Time
#      EC     Eccentricity, e
#      QR     Periapsis distance, q (km)
#      IN     Inclination w.r.t xy-plane, i (degrees)
#      OM     Longitude of Ascending Node, OMEGA, (degrees)
#      W      Argument of Perifocus, w (degrees)
#      Tp     Time of periapsis (Julian day number)
#      N      Mean motion, n (degrees/day)
#      MA     Mean anomaly, M (degrees)
#      TA     True anomaly, nu (degrees)
#      A      Semi-major axis, a (km)
#      AD     Apoapsis distance (km)
#      PR     Orbital period (day)


# parameters obtained from Horizons on 24 Dec 2007.

#2454459.416666667 = A.D. 2007-Dec-24 22:00:00.0000 (CT)
# EC= 1.256179029268478E-01 QR= 6.494997185555540E+04 IN= 1.128384058069160E+02
# OM= 2.271892037431778E+02 W = 3.556298167009237E+02 Tp=  2454459.764924064744
# N = 7.225538769525140E+00 MA= 3.574836526663564E+02 TA= 3.567351611932448E+02
# A = 7.428099462805170E+04 AD= 8.361201740054801E+04 PR= 4.982327428902012E+01

"Hydra" "Sol/Pluto-Charon"
{
   Texture       "bianca.jpg"
   Mesh      "asteroid.cms"
   Radius      70 # ~140 km diameter for 15% albedo

   InfoURL "http://www.boulder.swri.edu/plutonews/"

   EllipticalOrbit
   {
   Period          49.82
   SemiMajorAxis   74280
   Eccentricity    0.125
   AscendingNode   227.2
   ArgOfPericenter 355.6
   Inclination     112.8
   MeanAnomaly     357.5
   Epoch       2454459.4167
   }

   Albedo 0.15 # estimate, based on KBOs
}


#2454459.416666667 = A.D. 2007-Dec-24 22:00:00.0000 (CT)
# EC= 1.302717734201956E-01 QR= 4.880730628797963E+04 IN= 1.129470771636497E+02
# OM= 2.275705022974111E+02 W = 2.040627103329986E+02 Tp=  2454459.588568269275
# N = 1.100360241326909E+01 MA= 3.581084631101382E+02 TA= 3.575208678819746E+02
# A = 5.611788234114669E+04 AD= 6.342845839431375E+04 PR= 3.271655831238331E+01

"Nix" "Sol/Pluto-Charon"
{
   Texture       "bianca.jpg"
   Mesh      "pandora.cmod"
   Radius      70 # ~140 km diameter for 15% albedo
   
   InfoURL "http://www.boulder.swri.edu/plutonews/"

   EllipticalOrbit
   {
   Period          32.72
   SemiMajorAxis   56117
   Eccentricity    0.1303
   AscendingNode   227.6
   ArgOfPericenter 204.1
   Inclination     112.9
   MeanAnomaly     358.1
   Epoch       2454459.4167
   }

   Albedo 0.15 # estimate, based on KBOs
}


[Derek]

Thanks Selden right on all accounts and new code works a treat.

[chris]

#3: Yup, you're right, but...
that's a defect in the now-obsolete Nix-Hydra Addon triggering a bug in Celestia.

I've made a fix for that Celestia bug and submitted it to CVS.

--Chris

[Derek]

Hi,

I hate to raise the cloudshadow problem again but I've been reading through the developer talk forum on this subject. Having tried a number of things and like Bob Hegwood no shadows until I switched the "nightlights off" the shadows appeared what a difference.