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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.

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Life Level

The life level of a world defines (in very broad terms) how advanced native life is on the world. It ranges from no life at all, through simple single celled organisms, to land animals and extensive (Earth-life) conditions.

The life level of a planet is defined in the enum LifeType


Note that these classifications have just undergone a big change. The first three used to be Proteins, Protozoa and Metazoa. This didn't fit evolution very well however unless either Metazoa covered a very large range, or the names didn't fit the type of life they covered.


The evolutionary path on Earth can be considered to have been something like the following.

base organics originally formed, which were simple amino acids. Most worlds with liquid water will form basic organic molecules like this, but few progress any further.

When abiogenesis gives rise to simple organics, a world is rated as being Archaean. These are the first living things, mostly single celled organisms capable of asexual reproduction. Within a few hundred million years, multicelled Metazoa such as bacteria will evolve. At this point, life can stall until suitable levels of oxygen can build up in the oceans. Life more complex than bacteria will be present in small amounts towards the end, including sponges and Algae.

With the rise of oxygen, so the Aerobic stage is reached. Plankton consumes smaller life forms, forcing the evolution of larger and more complex organisms. Larger varieties of algae becomes Seaweed and jellyfish evolve. Eventually, the arrival of simple marine organisms, such as starfish, sea urchins and worms marks the last stages of the Aerobic classification.

The Complex Ocean period is heralded by the arrival of crustaceans, fish and other free swimming vertebrates.

Alien Evolution

The above assumes that things progress in much the same way as they did on Earth. This is unlikely, but easy. The above categories probably fit most evolutionary paths, however the details of each are unlikely to be the same on all worlds - e.g. when grasses first evolve and so on.

worldgen/planets/lifelevel.1248539557.txt.gz · Last modified: 2015/02/04 22:39 (external edit)