Wasn't Properties Koshling (I forget)?
Nope... AIAndy. Koshling did initial AI development for it.
The Disease system was all Hydro
The original purpose of the Properties system was to create the basis of the Disease system through, though it was setup a little off the original intent from the Properties system coding in that each disease was meant to have/be its own property. I don't think that would've worked out though. If we could ever finish the Outbreaks and Afflictions setup, we'd see something much closer to the original intent.
Eusebius' system used some of the religion mechanism to implement individual disease. We weren't.
I may need some help understanding the relationship between any religions and any diseases...
the disease being present as represented by the disease property for contagious diseases but environmental values or pollution property values for others.
That could still be done under Outbreaks and Afflictions if ever developed out in the XML.
how much higher that the needed property value the property was adjusted by
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and- possibly buildings
O&B can do that with individual buildings affecting recovery and outbreak chances of individual diseases. Existing disease outbreaks (far more model specific than generic health or unhealth, which can mean any kind of thing that's impacting the mortality rate of the population) can also impact the likelihood of other outbreaks, both generically and specifically.
For example Cholera, a contamination based disease ie due to not having clean water. It's "disease present" building is not based on the disease property but on the city population and the infrastructure of that city. Fresh water means no chance in a city of 3 or less. A Town Well for populations up to 10. An Aqueduct up to 20. And so on. It is usually a symptom of the infrastructure not being able to cope with the population. Water pollution would be a factor, probably in the severity.
A cool idea would be to thus base the outbreak of Cholera on the water pollution level in an O&A environment. It's doable but to make that work, most water pollution systems would also need to be outbreak and recovery based. That would thus be something to table until you could look at other things going on there and determine if it can all be based on similar systems. Best to address the rest of the diseases first.
Plague like diseases spread via trade routes based on transport technology and quarantine effectiveness.
Absolutely ready for implementation in O&A.
Health Care units get EXP from such outbreaks.
They also get XP for helping units and city populations overcome outbreaks in O&A. Again, all that's failing here so far is the work hasn't been done in the xml to set this stuff up. Because of how many situations and scenarios must be prepared for in O&A, the end result is extremely complicated to setup a disease in so is probably a bit too intimidating so far to follow what I've published enough to work through the design of a disease.
That said, if you're trying to make the point that the simple side of the disease system we have in place is overly basic, yeah, agreed.
Some diseases only affect units in the field if you are at war.
I'm not sure what the rationale for this on any disease would be but there's a lot of programming for unit disease interactions from diseases being used as weapons, spreading from unit to unit, from unit to city, from city to unit... there's so much possible and if we found boundaries in the development it's well prepped for further development. Furthermore, the AI is fairly well designed for it as it is.
