Fix constellation line fade distance

[AstroChara]

As per Issue #2176. Removed the random scaling factor applied to “dist” value, which is confusing and unintuitive. Now constellation lines should show up at interstellar distances, as preferred by many users. If fading at smaller distance is preferred then it would make sense to change the constants themselves rather than this.

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[375gnu]

If for some reason you need this, then:

1. add a new boolean flag in Render
2. add a new interface option to toggle distance fading

[AstroChara]

Eventually it may be a good idea to add a way to manually input custom fade distances for the three elements of constellations in the program. For now, simply turning the constellation lines off should be sufficient as it does more or less the same thing fading asterism lines outside the Solar System does.

[pedro-fixingstuff]

I think exposing the fade distances as settings in celestia.cfg would be good. It makes sense to have the fade itself be a toggleable setting (with the default being enabled!).

[AstroChara]

I think exposing the fade distances as settings in celestia.cfg would be good. It makes sense to have the fade itself be a toggleable setting (with the default being enabled!).

I support this idea. It allows full customizability of the fading while not being too difficult to implement (hopefully) nor taking too much space in the setting (you need three sliders for three elements).