A system in Master of Orion consists of a single star, optionally up to five planets, and at least one warp point.
When a system has planets, it can be colonized. A single system with several planets can be colonized by different empires, though this will create diplomatic tension between them.
Colony leaders and several colony structures will provide bonuses shared by all colonies in the system.
Modding[ | ]
Orbits are defined in Globals.yaml:
- globals: &Backend.Galaxy.SolarSystemGenerator
PLANETARY_ORBITS:
- minOrbitRadius: 0.40
maxOrbitRadius: 0.40
bodyCapacity: 1
- minOrbitRadius: 0.55
maxOrbitRadius: 0.55
bodyCapacity: 2
- minOrbitRadius: 0.70
maxOrbitRadius: 0.70
bodyCapacity: 3
- minOrbitRadius: 0.85
maxOrbitRadius: 0.85
bodyCapacity: 3
- minOrbitRadius: 1.00
maxOrbitRadius: 1.00
bodyCapacity: 3
LUNAR_ORBITS:
- minOrbitRadius: 0.125
maxOrbitRadius: 0.125
bodyCapacity: 1
- minOrbitRadius: 0.20
maxOrbitRadius: 0.20
bodyCapacity: 1
WARPGATE_ORBIT_RADIUS_OFFSET: 0.20
This defines five planetary orbits and two lunar orbits. Redefining this block can allow to have more orbits, though the outermost orbit should keep a maximum radius of 1.0. Once more planetary orbits are available, they can be implemented in PlanetaryDensityPackages.yaml.
- collection: &Backend.Galaxy.PlanetDensityPackage
items:
- key: normal_planetary_density
name: NORMAL_PLANETARY_DENSITY_NAME
displayOrder: 0
starDensities:
- star_type: star_blue_white
occupationChances:
- planetCount: 0
chance: 3
- planetCount: 1
chance: 16
- planetCount: 2
chance: 23
- planetCount: 3
chance: 25
- planetCount: 4
chance: 22
- planetCount: 5
chance: 11
- star_type: star_white
occupationChances:
- planetCount: 0
chance: 3
- planetCount: 1
chance: 8
- planetCount: 2
chance: 23
- planetCount: 3
chance: 31
- planetCount: 4
chance: 22
- planetCount: 5
chance: 13
...
Additional entries have to be created for each possible greater planetCount, and the chances must be redistributed. Note that any planetCount above 6 will result in the engine hanging, as the game uses a suffix table to name planets, and this table has only six entries. There are six types of stars and four planetary density sets, though the tutorial one can be ignored. But planetary densities are not enough, we also need to cover the stars themselves directly in StarTypes.yaml.
- collection: &Backend.Galaxy.StarType
items:
- key: star_blue_white
name: STAR_TYPE_BLUE_WHITE
nebulaeDensity: 2
description: STAR_TYPE_BLUE_WHITE_DESCRIPTION
occupationChances:
- planetCount: 0
chance: 4
- planetCount: 1
chance: 18
- planetCount: 2
chance: 28
- planetCount: 3
chance: 29
- planetCount: 4
chance: 15
- planetCount: 5
chance: 6
orbitChances:
- orbit: 1
chance: 20
- orbit: 2
chance: 20
- orbit: 3
chance: 20
- orbit: 4
chance: 20
- orbit: 5
chance: 20
orbits:
- orbit: 1
planetChance: 20
asteroidFieldChance: 0
gasGiantChance: 0
multipleObjectChance: 0
- orbit: 2
planetChance: 35
asteroidFieldChance: 0
gasGiantChance: 0
multipleObjectChance: 0
- orbit: 3
planetChance: 45
asteroidFieldChance: 0
gasGiantChance: 0
multipleObjectChance: 0
- orbit: 4
planetChance: 65
asteroidFieldChance: 20
gasGiantChance: 15
multipleObjectChance: 0
- orbit: 5
planetChance: 65
asteroidFieldChance: 15
gasGiantChance: 20
multipleObjectChance: 0
...
Each of the six star types needs to be covered. Once we have additional orbits and a chance for a planet to be generated there, we need to set the necessary information for the generation of this planet. This includes its size, defined in PlanetSizeChances.yaml.
- collection: &Backend.Galaxy.PlanetSizeChances
items:
- key: orbit_1
sizeChances:
- size: planetsize_tiny
chance: 25
- size: planetsize_small
chance: 39
- size: planetsize_medium
chance: 33
- size: planetsize_large
chance: 3
- size: planetsize_huge
chance: 0
- key: orbit_2
sizeChances:
- size: planetsize_tiny
chance: 20
- size: planetsize_small
chance: 35
- size: planetsize_medium
chance: 34
- size: planetsize_large
chance: 9
- size: planetsize_huge
chance: 2
...
Using this model, additional keys must be created for each new orbit.
In addition, it is also possible to have several planets per orbit, as hinted by the bodyCapacity values in orbit definitions. The chance of this happening is covered by multipleObjectChance in the star type definitions. Beware that enabling this risks creating visual glitches, by having planets overlapping each others. This can be alleviated by reducing planet scaling through changing the scaleFactor values in PlanetSizeTypes.yaml:
- collection: &Backend.Galaxy.PlanetSizeType
items:
- key: planetsize_tiny
name: PLANET_SIZE_TYPE_TINY
level: 1
maxTiles: 8
scaleFactor: 0.75
satelliteOrbits: 1
satelliteChance: 0.25
satelliteSizeChances:
- satellitesize_small: 1
pollutionCapacity: 250
terraformingCostFactor: 0.35
minRequiredFood: 75
maxRequiredFoodStart: 80
maxRequiredFoodEnd: 170
...
Besides orbits, planet counts, and planet sizes, a system is also defined by its planet biomes. The data for those is found in BiomeChances.yaml.
---
- collection: &Backend.Galaxy.BiomeChances
items:
- key: galaxy_young
inhabitable_biome_chance:
- star_type: star_blue_white
biomes:
- biome: biome_volcanic
chance: 20
- biome: biome_toxic
chance: 10
- biome: biome_radiated
chance: 31
- biome: biome_barren
chance: 26
- biome: biome_desert
chance: 8
- biome: biome_tundra
chance: 0
- biome: biome_arid
chance: 5
- biome: biome_ocean
chance: 0
- biome: biome_swamp
chance: 0
- biome: biome_terran
chance: 0
- biome: biome_gaia
chance: 0
...
There is a list of available biomes for each star type in each galaxy age category.
Orbits[ | ]
There are inner and outer orbits. This affects terraformation and pollution-induced degradation.
public PlanetBiomeType GetNextAvailableTerraformBiome()
{
if (this.biome.key == "biome_terran")
{
return SerializedData<PlanetBiomeType>.Get("biome_gaia");
}
if (this.orbitIndex < Star.ORBITS_PER_STAR / 2)
{
return this.biome.innerOrbitTerraformBiome;
}
if (this.orbitIndex > Star.ORBITS_PER_STAR / 2)
{
return this.biome.outerOrbitTerraformBiome;
}
return (new GameRandom(this.universe.turn).NextDouble() < 0.5) ? this.biome.innerOrbitTerraformBiome : this.biome.outerOrbitTerraformBiome;
}
private PlanetBiomeType GetDowngradedBiome(PlanetBiomeType biome)
{
PlanetBiomeType planetBiomeType;
if (this.orbitIndex < Star.ORBITS_PER_STAR / 2)
{
planetBiomeType = biome.innerOrbitDowngradeBiome;
}
else if (this.orbitIndex > Star.ORBITS_PER_STAR / 2)
{
planetBiomeType = biome.outerOrbitDowngradeBiome;
}
else
{
planetBiomeType = ((new GameRandom(this.universe.turn).NextDouble() < 0.5) ? biome.innerOrbitDowngradeBiome : biome.outerOrbitDowngradeBiome);
}
if (planetBiomeType != null)
{
return planetBiomeType;
}
Debug.LogError("Planet.GetDowngradedBiome(): Biome Type " + biome + " does not have a downgraded biome set! Returning same biome.");
return biome;
}
Note that this refers to orbit indices, not planet indices. A system with two planets can very well have both in an inner orbit, or both in an outer orbit.
External links[ | ]
- orbit with 2 planets? thread on the official forums