Plans API 1.10.2, 1.9.4 provides modders a very flexible API to include in their own mods that allows them to customize the generation of instant structures. Plans uses a rules-based engine to generate Minecraft structures. A JSON file (*.plan.json), called a Plan contains all the properties and rules used to construct a particular structure. The Plan file can be very simple and straight-forward to a very complex set of Plans that substitutes blocks, adds support rules, connectors, conditions, spawners and chests.
How to install:
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Plans API 1.10.2, 1.9.4 Download Links:
For Minecraft 1.8.9
For Minecraft 1.9.4
For Minecraft 1.10.2