Okay, thank you!

It's not tested yet. I plan to test and update the mod in next few days.

Hey, how is the 4.0 Compatability? Thank you!

It works with save games but it won't effect borders that are already closed.
Its not tested yet for 3.13 but I will update it in a few days.

Does it work on Save Games and in 3.13?

@ThePirateofNewMexico I'll do some testing to see what I can do without making the mod too complicated.

I would love to see this updated to include the following:
Instead of closing borders, you declare an enemy unwelcome. This means they can still pass through, but much like closing borders, you have to MANUALLY enforce it. You can then give them a warning(event that if accepted results in the fleet going MIA) that if refused gives a war goal that is simply keep enemy fleets out of your system being the war goal. A lot more complicated to code though, I imagine. Getting the AI to use it only when appropriate would be tough(No using it when your enemy heavily outnumbers you), and it should restrict war declaration to not being able to declare while you have fleets in their system.

@Reianor - your empire which is pathetic compared to mine is impeding my 300K fleet from getting to its destination. Would you rather let me move through your empire at no cost to you or would you rather I declare war and take the systems I need to move through away from you? Alternatively your empire which is equivalent to mine can charge me to move through it.

«Space is vast and it would be difficult to impede travelers from passing by a star system...»

Stellaris has a concept of starlanes, which have fixed exists. These act as natural bottlenecks. So it's actually incomparably easier to keep borders in space than on the planet, at least as far as stellaris is concerned.

Also keep in mind that in stellaris we more or less play the government. There could only be 3 types of border crossing by any of our units. Diplomatically permitted, covert, and military invasion. That permission or rather lack of it is what the closed borders are about. And there's absolutely nothing strange about it.

Besides stellaris DOES have neutral territory. It's just that AI and players always claim most of it because pretty much any star system is worth claiming. If neutral waters were worth claiming as private they'd have all been claimed as well.

Oh, wow, awesome! I actually love the concept so much that I had talked myself into updating it myself as a personal mod down the line, you're amazing!

Thanks @Shoff!
I just updated the mod. Changes were very small. Let me know if you notice any problems.

When I tested this mod today, the pseudo-closed borders seem to be working. I don't see anything conspicuously broken, but this isn't an exhaustive assessment either. I need to check on the error logs & whatnot to take a more comprehensive look

@Qillin Thanks. The mod is still almost 100% compatible, because the updates have barely touched border actions (exception is the civic pompous purists). I will get around to updating sometime soon.

Damn, this mod is two years old and still gets updated

Though I wish it was updated for 3.4, but it is okay to take a break :]

Certainly requires some testing. According to the Wiki Isolationism is almost certainly picked by Inwards Perfectionists, where it makes sense to decouple it from opinion. And Xenophobes have twice the weight for it, and they already have a good chance to be disliked anyways

@SBlack It might work ok, but then an isolationist would shut out empires that they have neutral relations with. So I may test it out awhile first.

Having the Isolationist diplomatic stance should also allow you to close borders

@Kepos As far as I know, the game doesn't allow a mod to have those nuances to open/closed borders.

@Scr(A)tch These suggestions may help if there is a good UI that doesn't require much micromanagement. If I find a good way I'll add updates to this mod.

Just a few suggestions to make it even closer to reality:
- you set your border policy more or less freely - xenophile governments must have open borders, else closed borders will just displease xenophile faction.
- you need fortifications (FTL inhibitors) to enforce closed border policy, or foreign ships can just do what they want.
- if someone crosses a closed border, they get diplomatic penalties and the offended country gets a "Border trespassing" casus belli.
- if you close your borders while there are foreign ships within your territory, they have a few months to get out before the diplo penalties and the casus belli trigger. If there's a FTL inhibitor in the same system they go MIA like vanilla.

Thank you for starting a mod on that matter.

I've tested it and it is fine, but from my view not far enough with it's changes, as it still sticks with on/off mechanics, where it should be related toward diplomacy.

Would you mind to view on borders more in-depth?

My suggestion is, to interlink the usage of borders with diplomatic treaties and have them seen as 'guarded borders' instead, while closed borders should be taken as 'visa regime' borders.

How about that way:

Open borders + research treaty = free access for science ships
Open borders + economic treaty = free access for (modded) trader ships
Open borders + migration treaty = free access for colonizers
Open borders + defensive treaty = free access for warships

Closed borders + any treaty = vanilla game

Thanks

Fantastic idea, love it