Onward to glory, comrades! (1.5.1 ideas)

Report bugs, bug fixes and workarounds here.
Avatar
t00fri
Developer
Posts: 8772
Joined: 29.03.2002
Age: 22
With us: 22 years 7 months
Location: Hamburg, Germany

Post #21by t00fri » 01.02.2008, 17:19

Frank,

1. Near galaxies such as Andromeda, Triangulum and most
prominently, Sagittarius, are much too bright when viewed
from our solar system. This has been commented before in
other threads. We need to drop their apparent magnitude at
least 50%.


We really discussed this issue and a number of people
including myself and Grant have given you a clear
answer.

Leaving aside Sagittarius Dwarf, because it's special, you
see the other galaxies too bright for the simple reason
that you tune your stars too bright!

Celestia is supposed to be a realistic simulation of the
Universe based on naked eye sensitivity, and thus you
cannot have the stars visible up to 11.5 magnitude
without displaying much of the bright galaxies like
Andromeda. Andromeda has an app.magnitude of only
4.3!
You have tuned your sensitivity to the stars like
viewed through a big telescope, where you also will see
bright galaxies VERY bright.

I have spent a lot of time in locking the galaxy brightness
correctly to the apparent star brightness. So I simply do
NOT accept your unfounded claims that the bright
galaxies appear too bright by 50%!


F.
Last edited by t00fri on 01.02.2008, 18:13, edited 3 times in total.
Image

tech2000
Posts: 258
Joined: 14.02.2006
Age: 52
With us: 18 years 9 months
Location: Skepplanda, Sweden

Post #22by tech2000 » 01.02.2008, 18:05

I fear there is no way to turn on orbits for stars to show how they orbit its barycenter?

Or am I wrong?

Cheers, Anders

Avatar
t00fri
Developer
Posts: 8772
Joined: 29.03.2002
Age: 22
With us: 22 years 7 months
Location: Hamburg, Germany

Post #23by t00fri » 01.02.2008, 18:23

Frank,

next concerning the sky color near zenit. Here is how it
looks on my screen:

Image

I think it looks about right. Just apply a few obvious Mie
atmosphere tunings to the parameters of Earth yourself.
It's all configurable to your taste by YOU, the astronomy
teacher! How about explaining your little students, how
atmosphere colors arise as well as what the Celestia
parameters stand for and ask them to model a nice Earth
atmosphere over the weekend? ;-)

It's FUN!!

F.
Image

Avatar
fsgregs
Posts: 1307
Joined: 07.10.2002
With us: 22 years 1 month
Location: Manassas, VA

Post #24by fsgregs » 01.02.2008, 19:58

Fridger:

Thanks for pointing out that one can tune the atmosphere to appear more realistic, by changing Mie atmosphere settings. Contrary to your sarcastic comments, however, these settings were never in an ssc file before 1.5.0, and are not "Obvious". Other than knowing that they involve sunlight dispersal in the atmosphere, I have never seen any description of what a Mie atmosphere setting in Celestia does, or what Celestia users would have to do to change it in the ssc file. I assume that statement will now garner another rude comment from you that "an astronomy teacher" like me should know these things. Well ... I would be very interested in a poll of just how many of the thousands of forum members like me know what Mie settings are, or what Celestia users are supposed to change our ssc file to read, in order to adjust the atmosphere to more realistic levels! Secondly, if the default settings are not realistic, prompting you (one of Celestia's developers) to use different more realistic settings, why has 1.5.0 been released with them? Why not just adjust Mie settings properly for all of us in the first place?

Regarding the galaxies, ... I will not engage you in conversation about them. Your postings regarding them are offensive and unprofessional in tone. :evil:

If anyone can share what Mie settings they use to make the atmosphere more realistic, I would be grateful.

Frank

Avatar
t00fri
Developer
Posts: 8772
Joined: 29.03.2002
Age: 22
With us: 22 years 7 months
Location: Hamburg, Germany

Post #25by t00fri » 01.02.2008, 21:21

fsgregs wrote:Well ... I would be very interested in a poll of just how
many of the thousands of forum members like me know
what Mie settings are,
Well, you are an astronomy teacher which most
members of this forum are NOT... Chris knows what Mie theory is, for example...

Why not just adjust Mie settings properly for all of us in
the first place?

That's up to Chris. He never asked me to implement my
settings ;-) . He made the present ones. So, please, talk
to him... But right now the settings are still a matter of
taste and personal experimentation. Also it's an
interesting learning experience. Users like 'cartrite' for
example, have made very nice atmospheres for
themselves and others. So I don't see why you can't do it,
too, if you don't like the present settings. This would
have saved some time for some of us...

A long time ago already the meaning of Mie parameters
of the Celestia atmosphere have been explained by Chris
and by myself in dedicated threads of this forum and in
our CelestialMatters site where many Celestians are
registered. Apparently, you have not read them.

These explanations might have been an interesting
challenge for someone with your professional dedication!

Here are some citations of material for you, 1.3 years old:

http://www.celestiaproject.net/forum/viewtopic ... 16&start=0
or here in a thread by Chris:
http://www.celestiaproject.net/forum/viewtopic ... 77&start=0

or here by me in CelestialMatters with lots of references
to basic reading. YES that site exists, too, and has lots
of material to offer!

http://forum.celestialmatters.org/viewt ... 16&start=0


++++++++++++++++++++++++++++
Look...personally I don't care whether you want to learn
this or not. But I do care when you formulate malinformed
reproaches towards some of us...
++++++++++++++++++++++++++++

F.
Image


Return to “Bugs”