HowTo:Edit Systems:Milkyway

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Autogenerated System Files

Since they are autogenerated, these systems must have some rules so that the generator knows what to make. These systems are autogenerated from the information contained in the XML file universe/milky_way.xml.

XML Schema Description

  • <galaxy> ... </galaxy> - Marks the beginning and end of the XML file.
    • <planets> ... </planets> - Section for defining the basic planet types and their textures.
      • <planet> ... </planet> - (repeatable) Individual planet description.
        • < var ... /> - (repeatable) The variables for each individual planet (var tag to be described later)
    • <systems> ... </systems> - You need it but I don't know why.
      • <sector ... > ... </sector> - (repeatable) A sector containg a group of systems.
        • name - the name of the sector. For, enigma_sector.
        • < var ... /> - (repeatable) The default variables for the entire sector (var tag to be described later)
        • <system ... > ... </system> - (repeatable) A system (to be a system it must be inside another sector tag).
          • name - the name of the system, for example, heavens_gate.
          • < var ... /> - (repeatable) To be described later (see below).

Variables

Variable Types

  • BOOL = boolean value = "true" or "false"
  • INT = integer
  • FLOAT = decimal number
  • FILENAME = the name of a file inside the universe directory.
  • STRING = Text


Planet Variables

Here is a list of all of the possible names and their values so far when using the < var name="" value="" /> tag within the <planet> tag.

  • name
    • Type: STRING
    • Description: Used to describe a type of planet in human-readable form. The type is also defined by an “initial,” which is the cross-reference variable used by the <system> tag to identify the type of <planet>.
    • Example 1: planet name="Frozen_Ammonia". This would use initial “fa”.
    • Example 2: var name="texture" value="planets/industrial"
  • texture
    • Type: FILENAME
    • Description: Defines the graphic to use for the planet, along with its folder location, starting from the “textures” folder. The graphics file is wrapped over a sphere, which is lighted by the system’s sun, so there is a day side and night side. Works in conjunction with the texture_ext to define the exact file to be used.
    • Example: var name="texture" value="planets/industrial"
  • initial
    • Type: STRING
    • Description: Used as a cross-reference value to indicate the types of planets present in a star system. Cross reference is between <planet> types and <system> planetary contents.
    • Example: var name="initial" value="fa" (frozen ammonia).
    • Example from a <system> tag: var name="planets" value="a a fr" (two agricultural planets and a frozen planet).
  • atmosphere
    • Type: BOOL
    • Description: Indicates whether this planet type has an atmosphere. Unclear where this value is used.
    • Example: var name="atmosphere" value="true"
  • lights
    • Type: STRING
    • Description: Name of file (including location) containing lighting information for the planet. Appears to include options for additional lighting files and instructions.
    • Example: var name="lights" value="planets/industrial_light.png planets/industrial_light_repeat.pngwrapx64wrapy64"
  • texture_max
    • Type: INT
    • Description: Used within the <planets> tag, which also contains <planet> tags.
    • Example: var name="texture_max" value="0"
  • texture_min
    • Type: INT
    • Description: Used within the <planets> tag, which also contains <planet> tags.
    • Example: var name="texture_min" value="0"
  • texture_ext
    • Type: filename extension
    • Description: Indicates the type of graphics file used for the texture. Used within the <planets> tag, which also contains <planet> tags.
    • Example: var name="texture_ext" value="png"


FIXME Add variables and definitions for texture_min, texture_max, and atmosphere usage.

Sector and System Variables

Here is a list of all of the possible names and their values so far when using the < var name="" value="" /> tag within the <system> or <sector> tag. If these variables are not set inside any of the sector tags (innermost overrides) the system will randomly use a number between the corresponding values of the unknown_sector/min and max "systems"

  • num_stars
    • Type: INT
    • Description: The number of suns in the system (to make binary systems).
    • Example:
  • sun_radius
    • Type: FLOAT
    • Description: The radius of the sun in the system.
    • Example: < var name="sun_radius" value="26000"/>
  • starlist
    • Type: FILENAME
    • Description: A file with a list of colors/textures/sprites for different sizes of stars:
    • Example < var name="starlist" value="stars.txt"/>
      • Contents of Stars.txt
        • "0 .3 1 .3 .1 stars/white_star.png"
        • "1000 .5 .5 1 .1 stars/white_star.png"
        • ... means, "if the radius of the star is greater than or equal to 0 but less than 1000, then use RGB color (.3,1,.3), variance (?) of .1 and a texture/sprite filename of "stars/white_star.png". The same goes for 1000, etc.
  • planets
    • Type: STRING
    • Description: The possible planet types (defined in the <planets> section in milky_way.xml) in the system.
    • Example: < var name="planets" value="a"/>
  • num_gas_giants
    • Type: INT
    • Description: The number of gas giant planets.
    • Example: < var name="num_gas_giants" value="3"/>
  • num_planets
    • Type: INT
    • Description: The total number of inhabited(?) planets (not including gas giants).
    • Example: < var name="num_planets" value="8"/>
  • num_moons
    • Type: INT
    • Description: The number of moons orbiting any planet.
    • Example: < var name="num_moons" value="2"/>
  • asteroids
    • Type: BOOL
    • Description: Whether there are asteroids or not.
    • Example: < var name="asteroids" value="true"/>
  • nebulae
    • Type: BOOL
    • Description: Whether there are nebulae or not.
    • Example: < var name="nebulae" value="true"/>
  • num_natural_phenomena
    • Type: INT
    • Description: How many asteroids/nebulae/? there are in the system.
    • Example: < var name="num_natural_phenomena" value="2"/>
  • namelist
    • Type: FILENAME
    • Description: a file containing a list of planet names to use.
    • Example: < var name="planetlist" value="planets.txt"/>
  • gasgiantlist
    • Type: FILENAME
    • Description: A list of possible textures for gas giants. If a " " follows the filename, then it will have atmosphere. If a " ^ " and another filename follows the first filename then the next texture will be used for lights.
    • Example: < var name="gasgiantlist" value="gas_giants.txt"/>
  • planetlist
    • Type: FILENAME
    • Description: A list of possible textures for non-gas-giant planets with the same rules as above.
    • Example: < var name="planetlist" value="planets.aera.txt"/>
  • moonlist
    • Type: FILENAME
    • Description: A list of possible textures for moons with the same rules as above.
    • Example: < var name="moonlist" value="moons.txt"/>
  • ringlist
    • Type: FILENAME
    • Description: A list of textures of planetary rings.
    • Example:
  • asteroidlist
    • Type: FILENAME
    • Description: A list of distances and units with the same format as unitlist.
    • Example:
  • nebulalist
  • Type: FILENAME
  • Description: A list of distances and units with the same format as unitlist.
  • Example: < var name="asteroidlist" value="asteroids.txt"/>
  • data
    • Type: INT
    • Description: The random number seed that is used to generate the system. This number ensures that the same system is generated each time.
    • Example: < var name="data" value="1039"/>
  • compactness
    • Type: FLOAT
    • Description: The scale of the star system.
    • Example:< var name="compactness" value="5.8"/>
  • faction
    • Type: FACTION NAME
    • Description: The name of the faction that owns the system.
    • Example:< var name="faction" value="aera"/>
  • backgroundlist
    • Type: FILENAME
    • Description: A list of background spheremaps/cubemaps without the extension (.png, .jpg, etc... ).
    • Example:
  • force
    • Type: BOOL
    • Description: If this is not true, then the system will clamp to the corresponding value of the unknown_sector/minlimit or maxlimit "system__ FIXME What's meant here exactly ??
    • Example:
  • num_starbases
    • Type: INT
    • Description: how many bases there will be (may be changed around with dynamic universe)
  • unitlist
    • Type: FILENAME
    • Description: A list of distances and units with the following format:
    • Example:< var name="unitlist" value="smallunits.txt"/>
    • Contents of smallunits.txt
      • Example: "U800^MiningBase U800^MiningBase A8480^AFieldBaseSparse&U400^MiningBase"
      • Format: "U"|"E"|"B"|"A"|"N"|"gas"|"jump"|"planet" distance-from-orbiting-planet "^" unit-name
      • Description of the Format
        • U = Unit
        • N = Nebula
        • B = Building
        • E = Enhancement
        • A = Asteroid.
      • You can have another object at the same coordinates by putting a "&" and another of these unit-distance pairs with no white space in between.
  • num_jump
    • Type: INT
    • Description: The number of jump points to other systems there are.
    • Example:
  • jumps
    • Type: STRING
    • Description: List of systems that this system jump points connect to.
    • Example: < var name="jumps" value="enigma_sector/harrison enigma_sector/repleetah"/>

Building a System

To create a system, follow these steps;

  • Always put the <system> tags first. Within the <system> tag use the name tag to specify the system name.
  • Using the planets variable define the possible types of planets.
  • Add the data value to specify the random seed value. From this value the same system will be created each time.
  • Using the Faction variable, specify who initially owns the system.
  • Define the number of planets using the num_planets variable. You can also define extra units, have a nebula or an asteroid field if you want.
  • Specfify the size of the sun using the sun_radius variable.
  • Define the position of the system in the galaxy using the xyz variable.
  • Specify the Jump destinations using the jumps variable.
  • Finally, close with the </system> tag.

Examples

These examples are excerpts from universe/milky_way.xml


Crucible/Cephid_17

<galaxy>
  ...
  <systems>
  ...
    <sector name="Crucible">
    ...
      <system name="Cephid_17">
        <var name="planets" value="mol *r v a bs gd bd *r gg gg fr"/>
	<var name="data" value="-932898433"/>
	<var name="faction" value="klkk"/>
	<var name="luminosity" value="0"/>
	<var name="num_gas_giants" value="0"/>
	<var name="num_moons" value="2"/>
	<var name="num_natural_phenomena" value="2"/>
	<var name="num_planets" value="3"/>
	<var name="planetlist" value=""/>
	<var name="sun_radius" value="16600.000000"/>
	<var name="xyz" value="389.551310 -309.661278 348.064561"/>
	<var name="jumps" value="Crucible/17-ar Crucible/Stirling 
             Crucible/Cardell Crucible/Enyo Crucible/Everett Crucible/Oldziey"/>
      </system>
    ...
    </sector>
  ...
  </systems>
</galaxy>

Planet Type Definitions

<galaxy>
  <planets>
  ...
    <planet name="Arid">
       <var name="texture" value="planets/desert"/>
       <var name="initial" value="a"/>    
    </planet>
    <planet name="Arid_Methane">
       <var name="texture" value="planets/frigid_mud"/>
       <var name="initial" value="am"/>     
    </planet>
    <planet name="Bio_Diverse">
       <var name="texture" value="planets/m_class"/>
       <var name="texture_max" value="4"/>
       <var name="initial" value="bd"/>
       <var name="atmosphere" value="true"/>
    </planet>
 ...
    <planet name="Tropical">
       <var name="texture" value="planets/carribean"/>
       <var name="texture_max" value="3"/>
       <var name="initial" value="t"/>
       <var name="atmosphere" value="true"/>
    </planet>
    <planet name="Oceanic">
       <var name="texture" value="planets/ocean"/>
       <var name="initial" value="o"/>
       <var name="atmosphere" value="true"/>
    </planet>
  ...
  </planets>
</galaxy>

See also

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