Structures
Structures are a feature of 0.4.3 that generate after the initial perlin heightmaps, located within the world.structures array in the World object. They will only generate if the generateStructures parameter is set to true, and their frequency is relative to the structureWeights param. See Parameters for more details on those parameters.
The currently only existing structure is the cactus, which generates in the more arid end of savannahs, and the more humid end of deserts.
