The Prerequisite System
The Prerequisite System controls the conditions required to build a certain object. Those conditions are:
- Is this object's TechLevel valid?
- Checks if the TechLevel of the object is above -1 and below [[[:Template:TTL]]]→Template:TTL.
- Can this house own this object?
- Checks if the house is listed in Template:TTL.
- Is this house not forbidden from owning this object?
- Checks if the house is not listed in Template:TTL.
- Is this house allowed to own this object?
- Checks if the house is listed in Template:TTL.
- Does this house own all the prerequisite structures?
- Checks if the house owns the prerequisite structures listed in Template:TTL
If all conditions are met, the house is theoretically allowed to build that object, signaled by a "New Construction Options" announcement.
Next, the game determines whether the house actually can build the object:
- Does the house own a Template:TTL of the appropriate type?
- Checks whether the house has at least one structure with Template:TTL matching the object's type.
- If the object in question is a VehicleType, does the house have a Template:TTL with the same Template:TTL setting as the object?
- Checks whether the house has a War Factory if it's trying to build land-based (Template:TTL) vehicles, and whether it has a Shipyard if it's trying to build water-based (Template:TTL) vehicles.
Note: If you do not have the appropriate type of Template:TTL, but all other prerequisites are fulfilled, you will probably experience the NCO-Bug.
Overrides
- If an object has a Template:TTL BuildingType set, a house will be allowed to build the object as soon as it possesses the overriding BuildingType, no matter what prerequisites the object usually requires. (Hence the name.)
- The same applies to objects from a Secret Lab: If a house gains an object through a Secret Lab, it will be allowed to build that object immediately, no matter what prerequisites the object usually requires.
- In addition, AI players do not check Template:TTL and Template:TTL tags when they're trying to build the Power Plants listed under Template:TTL,Template:TTL and Template:TTL.
All cases under the presumption that the house owns a factory of the appropriate type.
Prerequisite Groups
A "prerequisite group" refers to a list of structures, and any single one of them is sufficient to fulfill the "prerequisite group". The following "prerequisite groups" are valid:
- POWER (corresponds to Template:TTL)
- PROC (corresponds to Template:TTL and Template:TTL
) - BARRACKS (corresponds to Template:TTL)
- FACTORY (corresponds to Template:TTL)
- RADAR (corresponds to Template:TTL)
- TECH (corresponds to Template:TTL)
In Firestorm, two additional groups were available:
- GDIFACTORY (corresponds to Template:TTL)
- NODFACTORY (corresponds to Template:TTL)
