Re: [Stellarium-pubdevel] new star configuration parameters

[Johannes G. <joh...@gm...>]

On 2007.06.22 22:33:20 CEST, Rob Spearman wrote:

--------[snip]-----------
> > > What about a limiting magnitude setting, where stars past the cutoff
> > > just are not drawn (unless zoomed in...?)?
> > 
> > Yes, I have seen you have made some configuration variable for this
> > without any implementation. I will implement it, I just thought you
> > wanted to do this by yourself.
> 
> I ran out of time and wasn't sure you liked the idea.  If you feel like
> working on it, feel free.  I am sure you have a better idea of how to
> best implement it anyway.

So there are 2 new parameters:

mag_converter_max_mag = 30.0
for setting a global limiting magnitude independent of FOV

mag_converter_max_scaled_60deg_mag = 6.5
for setting  the limiting magnitude for FOV=60. This value is later mangled with the FOV
in order to get a limiting magnitude for the current FOV and ToneReproductor.
I thing you planned to have this, but just called it "limiting_magnitude"

> 
> > > 
> > > The point stars seem to look OK.  The only problem I noticed is that the
> > > planets draw as non-points in this mode now.  
> > 
> > The same way as before. It was hard work to make the planets draw as non-point,
> > and the code would become much easier if they would be drawn as point stars.
> > Please give your definite order in this case.
> 
> Yes, with point stars turned on planets should also draw as points.  If
> that is easier, all the better.

I changed it, but it did not become easier, as I thought.

---[snip]--------

> > You just state your personal opinion that you find the colors displeasing.
> > There is nothing to say against this, but you will understand that this opinion
> > is totally subjective. No falsification is possible.
> 
> Some of the colors just seem pretty different from what I see in the
> real sky.

Mike Lonehiker found a bug in the catalogs, so that the B-V value of Hipparcos
stars was corrupted. Try again with the new stars_0,1,2 catalogs.

>  I am sure there is some subjectivity in this perception, but
> I know I am not alone.  It seems like it could be tested with the right
> equipment.  But maybe not anything in our budget. :)

You would need to measure the darkness color perception of the human eye, which is different for
every single person. Since stellarium does not change the star colors for different brightness
I see no reason why to care.

-----------[snip]-----------


> > > 
> > > Anyone object to changing it back to 1.0?
> > 
> > I recommed you test it before saying yes or no: it has some impact on the overall
> > appearance, otherwise Fabien would not have changed it to 1.3.

In default config.ini star_mag_scale was even 1.4! I changed it back to 1.3, and I recommend 1.0.

Also I have put all new parameters with comments in default_config.ini.
Even more detailed comments are in StarMgr.h.

Perhaps this can go somehow into the user guide, if you like to, and Matthew wants to do it.

Johannes