code/__DEFINES/spatial_gridmap.dm

SPATIAL_GRID_CELLSIZE	each cell in a spatial_grid is this many turfs in length and width
SPATIAL_GRID_CONTENTS_TYPE_HEARING	everything that is hearing sensitive is stored in this channel
SPATIAL_GRID_CONTENTS_TYPE_CLIENTS	every movable that has a client in it is stored in this channel
HAS_SPATIAL_GRID_CONTENTS	whether movable is itself or containing something which should be in one of the spatial grid channels.

Define Details

whether movable is itself or containing something which should be in one of the spatial grid channels.

each cell in a spatial_grid is this many turfs in length and width

every movable that has a client in it is stored in this channel

everything that is hearing sensitive is stored in this channel