2016 11 02 direction

The desired direction of a pedestrian is defined following different algorithms: In the section of the chosen model the direction strategy should be specified as follows:

<exit_crossing_strategy>num</exit_crossing_strategy>

with num a positive integer.

The majority of the strategies define how a pedestrian crosses a line L = [P_1, P_2]. Possible values are:

1. The direction of the pedestrian is towards the middle of L (\frac{P_1+P2}{2})

2. The direction is given by the nearest point on L to the position of the pedestrian.
   L is shorten by 20 cm.

3. If the nearest point of the pedestrian on the segment line L is outside the segment, then chose the middle point as target.
   Otherwise the nearest point is chosen.

4. This strategy is still beta. It assumes that the simulation scenario has no loops or U-shaped corridors. Pedestrians, target he exit, even if it is outside their visibility range. In case of intersection with walls or obstacles, the temporary direction is rotated away from the wall.

5. Does not exist.

6. -9. Strategies using floor fields (ff) (vector fields); one ff per target (door, line, ...)

• The following parameters of a enhanced floorfield can be changed:
  - delta_h: discretization/stepsize of grid-points used by the floor field
  - wall_avoid_distance: below this wall-distance, the floor field will show a wall-repulsive character, directing agents away from the wall
  - use_wall_avoidance: {true, false} switch to turn on/off the enhancement of the floor field
  You can use them in the ini-file in the following form:

			<solver>euler</solver>
			<stepsize>0.01</stepsize>
			<exit_crossing_strategy>9</exit_crossing_strategy>
			<delta_h>0.0625</delta_h>
			<wall_avoid_distance>0.8</wall_avoid_distance>
			<use_wall_avoidance>true</use_wall_avoidance>

• 6: This strategy does use a floor field rather than heading towards a point on a line segment.

  For more details see this talk ¹ and the corresponding thesis ².

  (do not use in multi-storage buildings)

• 7: (experimental)

• 8: This strategy uses a floor field collection for each room.

  Thus the floor fields are smaller but cannot steer to targets in a different room.

  The router must provide intermediate targets for every agent, the target being in the same room.

  The projection of the room onto the (x,\, y)-plane must be non-overlapping!

• 9: This strategy uses a floor field collection for each subroom. (broken)

  Thus the floor fields are again smaller but cannot steer to targets in a different subroom.

  The router must provide intermediate targets for every agent, that target being in the same subroom.

  The projection of the room onto the (x,\, y)-plane must be non-overlapping!