UPDATE REGARDING PROGRESS: I don’t think my progress addon needs to be updated after all from a lighting perspective. Turns out that simply activating eclipse shadows eliminated 99.9% of this overbrightness issue. So unless this is really becoming a problem for other users, I think I’m going to leave the addon alone for now.
NOTE REGARDING STARSHIP: I have recently discovered that this addon fails to load the .cmod file on iOS devices. I cannot say if this is also happening on Android devices as I do not have an Android device on hand currently. As of this time, I haven’t been able to determine the cause of this problem. If at some point in the future however, I am able to find a fix for this, I will repost this addon in this thread with a note regarding the updates that were made to starship.
Gironde,
I wouldn’t look too much into the orbital information that my addons use currently. All of their orbits are purely fictional, though your insight into this aspect of addon development is still very much appreciated.
As for any such errors with certain axis’s not being defined, I’m not sure what’s going on as I have yet to encounter such problems with Progress. I’ll keep that in mind though going forward as I create future addons for Celestia. I will say that aside from Anim8tors random CTD’s, orienting my addons to the correct position has been an absolute chore in its own special way.
Regarding the specifics of this Progress spacecraft, I couldn’t really tell you as Google Arts & Culture doesn’t appear to provide any detail regarding what specific spacecraft are docked to their ISS 3D model. If you or anyone has information on the actual spacecraft in this model, I would be happy to take a look at it. For the moment however, I would simply treat it as a generic Progress vehicle.