Stellarium

lp:~georg-zotti/stellarium/gz_comet-tail-extinction

Created by gzotti on 2014-11-08 and last modified on 2014-11-08

My original comet tails of winter 2013/14 had one big flaw: brightness was computed globally. This made them almost pop out of twilight in full length, and bright comets were just too bright.

This branch has I think much better brightness balancing (query atmosphere and eye adaptation), and can reduce/influence tail brightness not only by vertex-wise extinction, but also by vertex-wise adaptation of tail length visibility to overall sky brightness. The increase in quality can at least be called "significant" IMHO.

To test, I recommend you copy ssystem_1000comets.ini to your ssystem.ini and have a look at e.g. comets Hale-Bopp (best in March/April 1997), Hyakutake (March 1996), PanSTARRS (March 2013), Halley (1986, 1910, 837), Bennett (1970), 1680, 1882, Donati (1858).

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Merged into lp:stellarium at revision 7129

Fabien Chéreau: Approve on 2014-11-08

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Branch information

Owner:: gzotti

Project:: Stellarium

Status:: Merged

Recent revisions

7120. By gzotti on 2014-11-08: avoid a log message
7119. By gzotti on 2014-11-08: Better brightness&color balancing for Coma
7118. By gzotti on 2014-11-08: radically improve brightness simulation of comet tails. Using color arrays, we now compute extinction and adaptation of tail length to twilight!
7117. By gzotti on 2014-11-08: docfix
7116. By gzotti on 2014-11-08: removed old comment
7115. By gzotti on 2014-11-08: Typofix in docs
7114. By gzotti on 2014-11-07: vertex-based extinction! TODO: New brightness balancing...
7113. By gzotti on 2014-11-07: clarified assertion
7112. By gzotti on 2014-11-07: fix for color modulated painting
7111. By gzotti on 2014-11-06: moved tail computation to update(), prepared colorArray for extinction of comet tails

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Repository format:: Bazaar repository format 2a (needs bzr 1.16 or later)

Stacked on:: lp:stellarium

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