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[ARIS] Enhanced Hearse AI

Oversees death services to ensure that hearses are dispatched in an efficient manner. See also:
- [ARIS] Enhanced Garbage Truck AI
- [ARIS] Early Death
- [ARIS] Remove Stuck Vehicles

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✓ CAN be used on existing games
✓ CAN be disabled at any time
✓ CAN be removed at any time
✓ Does NOT break savegames
✓ Does NOT cause permanent changes
✓ Does NOT conflict with original game code
✓ Does NOT conflict with other mods' code

Comparing to the vanilla AI, this AI:
1. Arranges pickups in a much more optimized way. Hearses should no longer travel back and forth across your city just to pick up 10 corpses. It will prioritize the ones close to its current location.
2. Respects district boundaries. If your cemetery/crematorium is inside a district, the hearses it send out will take care of the corpses within the district first, before venturing out.

There are two sets of important concepts to keep in mind for this mod:
1. Inside vs outside a district
2. Primary vs secondary pickup zone

If a cemetery/crematorium is inside a district, then:
1. Its primary pickup zone is the district
2. Its secondary pickup zone is its effective area, which is specified by the game as a radius range with the building as the center. This area is approximately 50% of one tile.

If a cemetery/crematorium does not belong to any district, then:
1. Its primary pickup zone include all the areas within its effective area that does not belong to a district
2. Its secondary pickup zone is the rest of its effective area

Hearses will always prioritize corpses in their primary pickup zone. However, there are several rules within this general rule:
1. Between problematic corpses (those showing the death sign) and nonproblematic ones (those that have no visual clues), hearses will prioritize the problematic ones for pickup
2. However, if they come across a nonproblematic one along their way, they will pick it up first; but only if it is not behind them
3. If there is a closer corpse of the same priority, they will redirect to the closer one; but only if it is along the original bearing
4. If there are no corpses left to pick up, hearses will "patrol" their primary pickup zone.

The pickup priority above exists to achieve a good balance between making the hearses as efficient as possible vs keeping your CIMs as happy as possible. When you see a death sign, that means a corpse has become a nusance and your CIMs are not happy about it. But if we were to prioritize getting rid of the death signs as fast as possible, we would have to take a large hit on overall efficiency; in fact, it would become counterproductive during death waves. On the other hand, if we were to do the opposite, then we would be ensuring maximum efficiency at the risk of losing buildings to abandonment. The existing setup benefits from both approaches by prioritizing problematic corpses for overall bearing, but at the same time allowing pickups of nonproblematic corpses along the way.

Each cemetery/crematorium gets its own dispatcher. The dispatcher will try to maximize the efficiency of all its hearses, i.e., reduce the chance that two hearses will be sent to the same location for pick up. HOWEVER, just like in real life, the dispatchers of different cemeteries/crematoriums will not call each other constantly to make sure they are not all dispatching for the same corpse. So, if you have multiple cemeteries right next to each other, it is possible that a corpse will be fought over by hearses from different cemeteries. With that said, it shouldn't be a common occurrence.

Because it has a corpse :) The game only puts up the death sign if a corpse has been sitting there for an extended period of time. One way to confirm this is to follow a hearse around. When it stops at one of those houses, you will be able to see that its load percentage increases.

Skylines Overwatch is a high efficiency monitoring framework that mods can attach to. By using it, attached mods don't have to monitor the city themselves. This not only makes coding mods easier, but also reduces each mod's burden on the system. See Skylines Overwatch for more information: http://steamproxy.net/sharedfiles/filedetails/?id=421028969

Check out the new FAQ: https://github.com/arislancrescent/CS-SkylinesOverwatch/wiki/FAQ

GitHub: https://github.com/arislancrescent/CS-EnhancedHearseAI

Death icon created by Michele Zamparo: https://thenounproject.com/term/death/103916/