The voxel_input inteface allows the equiped voxels to receive other voxels sent through this interface.
As an exemple, an atomic compressor have this interface, so a pump placed nearby can sent to it the pumped water voxels.
Theses voxels can be connected to voxels that uses the voxel_input interface.
Theses voxels can be connected to voxels that have the voxel_input interface