Move straight until you hit a wall. Then change direction,

1. There are only four walls (NSWE). Describe permutations of each wall with 4bits.
   • This is what GridAuthoring creates and is stored in GridWalls.
   • 4bits per grid cell (so two cells in the same row are packed into a byte)
2. Given grid x,y look up walls in that grid section.
3. For any given permutation of walls, the exit (next) direction is known.

• This is stored Paths in GridPathMovementSystem.
• It may be possible there are two equally good exit directions.
• So two path options are stored in Paths and are arbitrarily selected between.

4. It's possible to move around in a loop because of wall layout.

• While that's fine, just as a bonus we want to break the pattern a little.
• Under rare conditions, provide alternate exit direction from any grid section.
  • Which may be a grid you'd normally move straight through.
• This is stored as four extra path options in Paths in GridPathMovementSystem.