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Mapcraft - Fantasy map designer

WorldGen - SciFi universe generator

Mapcraft Web - Web based fantasy map designer

All code for the project is released under the GPL, and is copyright Samuel Penn.

The text on this wiki is dual licensed CC-BY-SA and GPL.

You can contact the author at


Star Systems

Consists of 1 or more stars, plus 1 or more planets. Non-UWP generated star systems could have zero planets. Systems with multiple stars will tend to have fewer worlds per star, with the majority around the primary star.

Planetary generation is very basic (randomly determine the type of a world, rather than simulating an accretion disc to build worlds or anything clever like that), and will generate systems similar to classical star system theory - i.e., rocky worlds near the star, jovian worlds further out and a few icy worlds on the extremities.

It is assumed that current (real world) methods for finding extra-solar worlds are biased towards finding exceptional cases, and that most systems will be similar to our own. Hot jovians can be generated, but they will be rare.

Main World

The main world is the world described by the Traveller UWP. Normally it is the world with the best star port, otherwise other factors are used to determine which one to use. If there are no populated worlds, then the most habitable world is chosen.

Note that the main world may be a moon. If a UWP defines a very small world, then a moon is chosen.


A system may have several smaller colonies, which can be mining colonies, research bases or just places for people to live.

Only nice worlds will have standard colonies.

Colonies may be controlled by the main world, or be external and/or independent. A low tech world, or one with a poor space port, will not have any colonies of its own. Otherwise, it is assumed colonies in a system are children of the main world.

worldgen/systems.txt · Last modified: 2015/02/04 22:39 (external edit)