With Terracell, the planet will be made up of a number of shaders each of which you enable/disable, and use your own imagemaps in thier place. There is a global topography shader which is responsible for the shapes of the continents, oceans, and islands, and a mountain shader which will give the continents depth with hills, valleys and peaks, as well as providing coastal islands, archipelagos, and ocean trenches. Seperately there will be biome maps which will distribute biomes across the planet according to altitude and randomness. The biomes are more than just coloring. They will determine where things like grass fields, wheat fields, bushes, trees, cacti, quartz veins, etc, will appear on the terrain. One of the important elements of the biome distribution system will be finding a way to determine latitude so that climate zones can modify biome distribution. An arctic desert would become a tundra, whereas a tropical forest would become jungle, and so on. If anyone has any ideas about how to create a latitude system, it would be much appreciated.