Galactic problem

PlutonianEmpire · Post #1by **PlutonianEmpire** » 23.10.2005, 07:19

For some reason, setting an angle on my fictional galaxy makes it disappear. Celestia says it's there, but I don't see it at all. On top of that, I can't make the Axis thingy do anything at all to the galaxy.

Code: Select all

Galaxy "Pluto Galaxy"
{
        Type  "Sa"
        RA            1.000
        Dec           7.58333333333333333333333333333333
        Distance     350000
        Radius         5e+04
        AbsMag        -35.0
        Axis    [  90.000 180.000  90.000]
        Angle    8.0000
}

Post #2by **Toti** » 23.10.2005, 10:22

Your axis vector is incorrectly defined.
You must use a vector of length = 1.
Just an example:

Code: Select all

Galaxy "Pluto Galaxy"
{
         Type  "Sa"
         RA            1.000
         Dec           7.58333333333333333333333333333333
         Distance     350000
         Radius         5e+04
         AbsMag        -35.0
         Axis    [  0.500 0.500  0.7071067811865475]
         Angle    8.0000
}

PlutonianEmpire · Post #3by **PlutonianEmpire** » 23.10.2005, 10:23

Toti wrote:Your axis vector is incorrectly defined.
You must use a vector of length = 1.
Just an example:
Code: Select all
Galaxy "Pluto Galaxy" { Type "Sa" RA 1.000 Dec 7.58333333333333333333333333333333 Distance 350000 Radius 5e+04 AbsMag -35.0 Axis [ 0.500 0.500 0.7071067811865475] Angle 8.0000 }

Thanks!

PlutonianEmpire · Post #4by **PlutonianEmpire** » 23.10.2005, 10:45

I just discovered that really small "galaxies" that I use to show globular clusters (again, fictional ones) flicker really badly until you get really close or inside them. Is there a solution to this, or is this a bad bug?

Example:

Code: Select all

Galaxy "Pluto Globular"
{
        Type  "E0"
        RA           17.00000000
        Dec         110.00000000
        Distance      20000.000
        Radius         170.000
        AppMag           8.000
        Axis    [  0.000   0.000   0.000  ]
        Angle      0.0000
}

Post #5by **t00fri** » 23.10.2005, 11:18

PlutonianEmpire wrote:I just discovered that really small "galaxies" that I use to show globular clusters (again, fictional ones) flicker really badly until you get really close or inside them. Is there a solution to this, or is this a bad bug?

Example:
Code: Select all
Galaxy "Pluto Globular" { Type "E0" RA 17.00000000 Dec 110.00000000 Distance 20000.000 Radius 170.000 AppMag 8.000 Axis [ 0.000 0.000 0.000 ] Angle 0.0000 }

This is a Windows ONLY feature of FT1.1 which has been fixed (although not been well understood yet!). Depending on both Toti's and my lack of time in the coming weeks, we will either manage to release FT1.2 during this week or only in 3 weeks from now. There is still another bug to be fixed (Milky Way visible at daylight etc)

Bye Fridger

PS: Perhaps you better do not use too unrealistic values for AbsMag, else the rendering scheme might eventually stop working. Both values -35 and +8 are absolutely unrealistic for galaxies, whose average AbsMag ~ -20. You will remember that the difference between AbsMag = -n and -(n+1) is a factor of TEN in luminosity! So your AbsMag =-35 galaxy has a luminosity higher by a factor

1000000000000000

than the average luminosity ;-)

You AbsMag =+8 'galaxy' has a luminosity
lower by a factor

10000000000000000000000000000

than the average galaxy luminosity!