1. CIS 488/588 Bruce R. Maxim UM-Dearborn
Unreal Bot Navigation
CIS 488/588
Bruce R. Maxim
UM-Dearborn
12/7/2018

2. Basics Must be done in Unreal Tournament 2004 not the runtime version
In general paths are built among PathNodes PlayerStarts, pickups, and actors that let bots deal with obsticles (jump points, doors, lifts)
You need rebuild AI paths using the button on the top tool bar
You can toggle viewing of AI paths using the RMB on one of the viewport title bars and choosing View>ShowPaths
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3. Path Nodes - 1 Tutorial 12.1 Open the map in Tutorial12_01_Start.ut2
If you add any bots added to this level they will do nothing
You can use the RMB to open the context menu and add Path Nodes any where in the level
You want to add enough Path Nodes so that every navigation point is reachable in the map
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4. Path Nodes - 2 Tutorial 12.1
Rebuild the AI paths using the top menu button and use RMB to check path layout
Adjust the position of any node needed to make most of the path Green
Rebuild the level and test it
Open the console in Unreal by typing ~
Type ghost and the type addbots 1
Move outside the map and observe the bot’s movements
12/7/2018

5. Path Color Codes White wide path (big NPC’s or vehicles)
Green relatively wide (big NPC’s)
Blue narrow (small NPC’s)
Purple lift, teleporter, jump pad
Liliac ladder
Yellow forced path (create additional link)
Red proscribed path (break node link)
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6. Jumping Onto Ledge - 1 Tutorial 12.2
Use Tutorial12_02_Start.ut2
Open Actor class browser, expand NavigationPoint>JumpDest and select JumpSpot
Use RMB to place the JumpSpot near the middle edge of the upper level
You need to force a path from the nearest PathNode to the JumpSpot
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7. Jumping Onto Ledge – 2 Tutorial 12.2
In the PathNode Properties window, expand the NavigationPoint category and enter JumpSpot1 and the value of ForcedPath[0]
It’s also a good idea to open the Properties window for the JumpSpot actor, expand the JumpSpot category, and set the value of bForceAllowDoubleJumping to True
Rebuild paths, save, and test (using ghost and addbots)
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8. Translocating Through Hole Tutorial 12.3
I have not gotten this example to work yet
12/7/2018

9. Simple Door - No Door Actor Tutorial 12.4
Use Tutorial12_04_Start.ut2
Open the Properties window for the BlastDoor
Expand the Collision category and set bPathColliding to False
Rebuild the paths and now you see a path passing through the door (the bots will too)
Save and test the map
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10. Simple Door With Door Actor Tutorial 12.5
Use Tutorial12_05_Start.ut2
Open the Actor class browser, expand NavigationPoint, and select Door
Use RMB to add Door in center Door Mover
Open the Properties window for the Door, expand the Door category, set the DoorTag property to BlastDoor, and the DoorTrigger property to BlastDoorTrigger
Rebuild the path, save, and test
12/7/2018

11. Complex Bot-Door Interaction - 1 Tutorial 12.6
Use Tutorial12_06_Start.ut2
We want to set up a bot trigger away from from the door and wait for door to open before entering it
Open the Actor class browser, expand NavigationPoint, and select Door
Use RMB to add a Door in center of the Door Mover
12/7/2018

12. Complex Bot-Door Interaction - 2 Tutorial 12.6
Open the Properties window for the Door, expand the Door category, set the DoorTag property to BlastDoor, and the DoorTrigger property to BlastDoorTrigger
Rebuild the path, save, and test (note that the bots go to the Trigger to open the BlastDoor and not directly to the BlastDoor)
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13. Bot-Navigable Lift - 1 Tutorial 12.7
Use Tutorial12_07_Start.ut2
Open the Actor class browser, expand NavigationPoint, and select LiftExit
Use RMB to add a LiftExit in front of the LiftMover and one at the top of the platform
Open the Properties window for the LiftExit in front of the LiftMover, expand the LiftExit category, set LiftTag to LiftMover, and SuggestedKeyFrame to 0
12/7/2018

14. Bot-Navigable Lift – 2 Tutorial 12.7
Open the Actor class browser, expand NavigationPoint, and select LiftCenter
Use RMB to add the LiftCenter near the lift and move it to the center of the LiftMover
Open the Properties menu for the LiftCenter, expand the LiftCenter categtory, change the LiftTag property to LiftMover (the Tag property of the LiftMover)
12/7/2018

15. Bot-Navigable Lift - 3 Tutorial 12.7
Open the Properties window for the LiftExit on top of the platform, expand the LiftExit category, set LiftTag to LiftMover, and SuggestedKeyFrame to 1
Rebuild the paths, save, and test (use ghost mode and addbots)
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16. Assault Paths
In Capture the Flag or Bombing Run you may wish to have the bots choose paths to objectives more carefully
You can assign priorities to multiple assault paths or designate one path for the attack routes and one for the return route
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17. Using Assault Paths - 1 Tutorial 12.8
Start with the map file Tutorial12_08_Start.ut2
Open the Actor class browser, expand NavigationPoint, and select AssaultPath
Place one AssaultPath in the upper hallway near the Shield Charger
Use the RMB to open the AssaultPath properties window, open the AssaultPath category, set PathTag[0] to AttackPath, set the ObjectiveTag to xBlueFlagBase, and set bNoReturn to True
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18. Using Assault Paths - 2 Tutorial 12.8
Place the second AssaultPath along the lower walkway
In the properties window for this AssaultPath, open the AssaultPath category, set PathTag[0] to AttackPath, set ObjectiveTag to xBlueFlagbase, and bReturnOnly to True
Rebuild the paths, save and test the map (using Ghost mode will make it easier to observe the action)
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19. Creating Defense Points - 1 Tutorial 12.9
Start with map file Tutorial12_09_Start.ut2
Select UnrealScriptedSequence in the Actor class browser
Add the UnrealScriptedSequence actor in front of the blue team’s Sniper Rifle weapons base
Rotate actor to face flag (the area being defended)
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20. Creating Defense Points - 2 Tutorial 12.9
Use RMB to open the properties window, open the Events category set and set Tag property to DefendBlueFlag
Expand UnrealScriptedSequence category and set
bSniping property to True
WeaponPreference to SniperRifle
Save and run the map
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21. Vehicle Navigation RoadPathNodes HoverPathNodes FlyingPathNodes
Placed like PathNodes, make sure paths are white
You should adjust the value of MaxRoadDist to remove connections between parallel roads
HoverPathNodes
Use instead of RoadPathNodes to allow traversal of unusual terrain elements
FlyingPathNodes
Defined by CollisionHeight and CollsionRadius properties
12/7/2018