How to Use Navigation Point Rules (Applications)

The screenshots shown below give examples of how navigation points can be used to control the operation of a session.

User Path Selection

1. The Scenario:

A user controlled train stops at a navigation point in front of a junction and the driver is offered a choice of paths to allow a passing movement by an AI controlled train. Each path requires a different set of navigation points to be shown and for the AI train to be given different commands.

2. Rules Used:

• Navigation Display Rule creates the navigation point sets.
• Navigation Set Hide/Show Rule to hide and display the navigation point sets.
• Wait on Navigation Point Rule to trigger the message event.
• Navigation Set Clear Rule to manually terminate a navigation point set.
• Message Popup Rule to open a message window on the screen.
• Set Junctions Rule to set and lock junctions.
• Set Signal Extended Rule to set signals.
• Wait Rule to introduce a short delay.
• Driver Schedule Rule to give commands to the AI controlled train.

3. Session Logic:

Three sets of navigation points are created, one for each location on the map diagram above.

• Set A: at the junction, Point A in the map diagram. The two signals are set to STOP, Switch 2 is locked in position and the user is presented with a choice of using the Main Line or the Loop Line
• Set B: at the end signal on the Main Line. Switch 2 is set to the Loop Line and the AI train is given its instructions to pass on the Loop.
• Set C: at the end signal on the Loop Line. Switch 2 is set to the Main Line and the AI train is given its instructions to pass on the Main.

4. Session Rules Screenshot:

• Creating the Navigation Point Sets

Each set is created separately and sets B and C are hidden.

Each navigation point is attached to a track trigger - Point 1 in Set A is attached to a trigger placed in front of Switch 1 in the map diagram.

Navigation Point Set A

• At Navigation Set A Point 1 - the junction

• Line 1: Wait on Navigation Point The event is triggered when the consist reaches (and stops at) Navigation Point 1 in Set A.
  • Line 2: Navigation Set Hide/Show The Navigation Set B is made visible.
  • Line 3: Navigation Set Hide/Show The Navigation Set C is made visible.
  • Line 4: Set Junctions The junction Switch 2 is locked against user and AI control.
  • Line 5: Set Signals Extended Signal A is set to STOP
  • Line 6: Set Signals Extended Signal B is set to STOP
  • Line 7: Message Popup A message browser window is shown giving instruction to the user to set Switch 1 to the Loop Line or the Main Line and then move the consist forward to the next signal.

Then EITHER ...

• At Navigation Set B Point 1 - the stop signal on the Main Line

• Line 1: Wait on Navigation Point The event is triggered when the consist reaches (and stops at) Navigation Point 1 in Set B.
  • Line 2: Navigation Set Clear The Navigation Set C is deleted and its visible Navigation Point disappears from the screen as the Loop Line path was not selected.
  • Line 3: Message Popup A message browser window is shown giving instruction to the user to wait until the passing train has cleared Switch 1
  • Line 4: Set Junctions The junction Switch 2 is set to the Loop Line but is still locked against user and AI control.
  • Line 5: Wait A wait of 20 seconds then ...
    • Line 6: Driver Schedule The AI train is given commands to move to the next destination via the Loop Line.

... OR ...

• At Navigation Set C Point 1 - the stop signal on the Loop Line

• Line 1: Wait on Navigation Point The event is triggered when the consist reaches (and stops at) Navigation Point 1 in Set C.
  • Line 2: Navigation Set Clear The Navigation Set C is deleted and its visible Navigation Point disappears from the screen as the Main Line path was not selected.
  • Line 3: Message Popup A message browser window is shown giving instruction to the user to wait until the passing train has cleared Switch 1
  • Line 4: Set Junctions The junction Switch 2 is set to the Main Line but is still locked against user and AI control.
  • Line 5: Wait A wait of 20 seconds then ...
    • Line 6: Driver Schedule The AI train is given commands to move to the next destination via the Loop Line.

Related Trainz Wiki Links:
   Controlling Junctions in Sessions
   Message Popup Rule Applications
   Message Popup Rule Examples
   Using Variables in Sessions - Examples