The entity falls and generates electricity
Several generators are provided, which hit the top of themselves by falling entities to produce Fe.
It can be configured for gravity generator, and the configurable options are:
Maximum storage capacity of generator;
Maximum output of generator (per tick);
The ratio of falling distance converted into power generation;
Whether to use the entity blacklist (the default is true, if false, the whitelist will be used);
Entity blacklist list (empty by default);
Entity white list (empty by default).
