This section describes how to set up backdrop computations affecting the environment.
Cyclic changes in the environment are governed by a yearly cycle or a daily cycle whose length must be defined.
WorldProperty: year-length n
This property is the number of turns in an annual cycle.
If less than 2, then no seasonal effects will be calculated.
Defaults to 0.
WorldProperty: day-length n
This property is the number of turns in a single day.
If less than 2, then day and night will not be calculated.
Defaults to 0.
Note that year-length and day-length are
completely independent of each other, and it is possible
to have days that are longer than years.
AreaProperty: initial-year-part n
This property is the season of the first turn in the game.
Defaults to 0.
AreaProperty: initial-day-part n
This property is the hour of the first turn in the game,
in 100ths of a day part.
Defaults to 0.
GlobalVariable: season-names list
This global is a list of which turns in a year should be called
which seasons. It has the form (... (n1 n2 name) ...).
Defaults to ().
UnitTypeProperty: acp-season-effect interpolation-list
This property is the effect of the seasons on acp.
The input value is the year part, and the result value
is added to the basic acp-per-turn.
Defaults to ().
TerrainTypeProperty: temperature-average n
This property is the average temperature for each type of terrain.
Defaults to 0.
TerrainTypeProperty: temperature-variability n
This property is the amount of totally random variation
in the temperature in each cell.
Defaults to 0.
GlobalVariable: temperature-year-cycle ((x y) interpolation-list)...
This global is a list of interpolation lists used to set basic temperatures
at given points in the area. The input value for each list is the current year
part, while the result is the temperature at x,y.
Then for each point in the area, its temperature is the interpolation of the
temperature at the two nearest given points.
Defaults to ().
TerrainTypeProperty: temperature-moderation-range distance
This property is the radius of the area whose raw temperatures will be averaged
to get the actual temperature.
This can be very time-consuming to calculate,
so only values of 0 (no averaging)
and 1 (average with adjacent cells) are recommended.
Defaults to 0.
UnitTypeProperty: acp-temperature-effect interpolation-list
This property is the effect of temperature on acp.
The input value is temperature, and the result value
is multiplied with acp, after it has been modified for
night effect, but before modification for season.
The result is divided by 100, so an effect < 100 reduces acp, an effect
of 100 has no effect, and an effect > 100 increases acp.
Defaults to ().
UnitTypeProperty: consumption-temperature-effect interpolation-list
This property is the effect of temperature on material consumption.
Defaults to ().
UnitTypeProperty: temperature-attrition interpolation-list
This property is the effect of temperature on a unit's hp.
The input value is temperature, and the result value is the
number of hp that the unit will lose each turn at that temperature.
Defaults to ().
Transports can protect their occupants from temperature extremes.
Table: temperature-protection u1 u2 -> t/f
TerrainTypeProperty: wind-force-average n
This property is the average wind force in a type of terrain.
Defaults to 0.
TerrainTypeProperty: wind-force-variability n%
This property is the chance that the wind in a cell will increase
or decrease in force each turn.
Defaults to 0.
TerrainTypeProperty: wind-variability n%
This property is the chance that the wind in a cell will
change direction each turn.
Defaults to 0.
GlobalVariable: wind-mix-range n
This variable is the radius out to which winds interact.
If 0, then winds in adjacent cells can vary independently
of each other, and do not interact in any way.
Defaults to 0.