Does the Exposure mechanic work correctly?

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Fizix

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"Exposure is a natural process, occurring when your culture has counties that border another culture with a specific innovation. The more you have in common (culture group, religion, and so on) with that other culture, and the more of its counties your culture borders, the faster you’ll unlock that innovation." - CK3 Dev Diary #27 https://www.crusaderkings.com/news/dev-diary-27-cultures-cultural-innovations

Image #1 - When you compare it with the description in-game it sounds quite confusing.
exposure.png


Regardless, I want to know if the mechanic is meant to be a way to catch up culture tech based on nearby counties.

Background: I recently forced the Kingdom of Portugal to spawn. Took the land myself and gave a duke independence and some gold so he can tap the decision. At the time Portuguese culture didn't exist. The majority of the world was nearing the start of the High Medieval Portuguese culture spawned once this guy created the kingdom and to my shock I realized that their culture tech sucks. They were stuck in tribal tech with Early Medieval yet to be discovered. It made me realize that taking one of those decisions so late in the game actually screws you over. Maybe its just oversight. Either way, I was right around the vanilla 1066 start date at this point. Game started 867.

Image #2 - Fast forward some years. 1095 AD. Portuguese culture is in the Early Medieval era. Sweet. It is here that I even realized Exposure was a mechanic. I didn't notice the faint purple color border around the innovations. So based on the descriptions above Portuguese should be getting exposure from nearby christian counties or even Andalusian ones right? I'm not sure how exposure gets calculated but for whatever reason Portuguese was getting exposure from Punjabs? Via religion? How? I started clicking around and checking counts and dukes. I didn't find any Christian link for this to make sense. India though? How is that the nearest place for exposure?

2020_09_12_6.png



Image #3 - I noticed the same thing for Andalusian culture. Uyghurs were the exposure. It makes slightly more sense because in this example they were found to be a separate Islamic faith. I don't have a screenshot for that. Though, shouldn't Andalusian have been getting exposure from some place a bit closer than East Asia?

2020_09_12_2.png



So what is wrong? I have an odd theory that maybe the Exposure values are either not caring about distance or its going off the edge of the map. I have no way of actually testing this but can this value ignore the edge of the map and warp over to the eastern side of the map?

Another thing I've noticed is that most of the time Exposure is religion based.

Image #4 - Sometimes it can be realm based but I'm not sure how it is making that calculation. Butr culture is getting exposure from Assyrians. The center right circle is one county with Butr where it could maybe getting influence from? The far right circle is the only Assyrian county that I can find existing.

Butr.jpg



Any thoughts on this? I certainly believe its meant to be a catch up mechanic to bring smaller cultures up to speed. Though with my case of Portuguese, it will/could go alot faster if it actually gained exposure off cultures that are actually nearby and similar (religion). I mean thats what the description says right? The more common things such as counties bordering, culture group, religion etc.
 
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Jarolleon

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"Exposure is a natural process, occurring when your culture has counties that border another culture with a specific innovation. The more you have in common (culture group, religion, and so on) with that other culture, and the more of its counties your culture borders, the faster you’ll unlock that innovation." - CK3 Dev Diary #27 https://www.crusaderkings.com/news/dev-diary-27-cultures-cultural-innovations

Image #1 - When you compare it with the description in-game it sounds quite confusing.

Regardless, I want to know if the mechanic is meant to be a way to catch up culture tech based on nearby counties.

Background: I recently forced the Kingdom of Portugal to spawn. Took the land myself and gave a duke independence and some gold so he can tap the decision. At the time Portuguese culture didn't exist. The majority of the world was nearing the start of the High Medieval Portuguese culture spawned once this guy created the kingdom and to my shock I realized that their culture tech sucks. They were stuck in tribal tech with Early Medieval yet to be discovered. It made me realize that taking one of those decisions so late in the game actually screws you over. Maybe its just oversight. Either way, I was right around the vanilla 1066 start date at this point. Game started 867.

Image #2 - Fast forward some years. 1095 AD. Portuguese culture is in the Early Medieval era. Sweet. It is here that I even realized Exposure was a mechanic. I didn't notice the faint purple color border around the innovations. So based on the descriptions above Portuguese should be getting exposure from nearby christian counties or even Andalusian ones right? I'm not sure how exposure gets calculated but for whatever reason Portuguese was getting exposure from Punjabs? Via religion? How? I started clicking around and checking counts and dukes. I didn't find any Christian link for this to make sense. India though? How is that the nearest place for exposure?

Image #3 - I noticed the same thing for Andalusian culture. Uyghurs were the exposure. It makes slightly more sense because in this example they were found to be a separate Islamic faith. I don't have a screenshot for that. Though, shouldn't Andalusian have been getting exposure from some place a bit closer than East Asia?

So what is wrong? I have an odd theory that maybe the Exposure values are either not caring about distance or its going off the edge of the map. I have no way of actually testing this but can this value ignore the edge of the map and warp over to the eastern side of the map?

Another thing I've noticed is that most of the time Exposure is religion based.

Image #4 - Sometimes it can be realm based but I'm not sure how it is making that calculation. Butr culture is getting exposure from Assyrians. The center right circle is one county with Butr where it could maybe getting influence from? The far right circle is the only Assyrian county that I can find existing.

Any thoughts on this? I certainly believe its meant to be a catch up mechanic to bring smaller cultures up to speed. Though with my case of Portuguese, it will/could go alot faster if it actually gained exposure off cultures that are actually nearby and similar (religion). I mean thats what the description says right? The more common things such as counties bordering, culture group, religion etc.
Exposure only works on one innovation at a time, and seems to randomly select from the cultures with that innovation and those commonalities to be the source. For some reason adjacency is not ranked higher than common religion in this selection process, so as the Anglo-Saxons I was getting Exposure for Public Works from the Ethiopians! (And no, they had not colonized Africa.. yet).
 

Fizix

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Exposure only works on one innovation at a time, and seems to randomly select from the cultures with that innovation and those commonalities to be the source. For some reason adjacency is not ranked higher than common religion in this selection process, so as the Anglo-Saxons I was getting Exposure for Public Works from the Ethiopians! (And no, they had not colonized Africa.. yet).

Yeah, I'm going to assume this isn't WAD. Going to throw this post in a bug report.

A PDX response would be helpful though to determine if its supposed to be based on adjacent/similar cultures. That should be noted in the tool tip.
 
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