I checked in a small changes to make galaxies pickable with the mouse.
The files universe.cpp and universe.h were affected. Currently, you can
select galaxies even when galaxy rendering is turned off. This doesn't
seem like the right behavior, so I'll fix it in a future check-in.
Fridger, I made a small tweak to your galaxy culling change. It wasn't
working from outside the Milky Way because it ignored the camera
position. I changed a few lines in render.cpp, and now it works fine.
Your culling change update is proving essential now that someone's made a
1000 galaxy database for Celestia.
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