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Buildings & Interactions
Many game features are implemented through interactions with static objects added to the world map. The game code refers to these as 'Buildings' (because initially, most of the time, that's what they were) but they can be any interactable thing. (e.g. You could have a 'building' set to use tree model, and when the user interacts with the tree 'building' they're given some coconuts).
The game provides a range of different building types to perform standard functions ; most commonly this means interactions with the building open up a UI window listing items for sale and items that the building will purchase from the player. In addition, the building will run timed update cycles allowing it to regularly generate new items or manufacture them from others that have been supplied to it. The types of items available in standard buildings are controlled in the Buildings Editor.