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# BlockedPath

Actor >> NavigationPoint >> BlockedPath

This is UT, right? Category To Do

The BlockedPath actor works by telling the AI of Pawns in the level that it is extremely inadvisable to set a course that leads through this point in the navigation network. This is done by setting an ExtraCost value of precisely 100,000,000 in the BlockedPath's properties. However, a BlockedPath can be unblocked simply by triggering it. While this is of no consequence to players, it is of much use to mappers who are trying to get good bot support into their levels, and is often used in Assault maps.

## Extending

Unfortunately a BlockedPath is an one-way actor; once it is triggered, there is no way to make it blocked again. However, it would be simple enough to create a two-way BlockedPath with just a few lines of UnrealScript, and it even works. Also note that setting a path node's ExtraCost to anything less than said 100,000,000 doesn't reliably prevent bots from using this path. (...fill in detailed description here.)

The code necessary to make a BlockedPath actor that can be toggled follows below. Create A Subclass explains how to add this to a map.

    class BlockablePath extends NavigationPoint

    var() bool bInitiallyActive

    function Trigger( actor Other, pawn EventInstigator )
    {
         bInitiallyActive=!bInitiallyActive;

         if (bInitiallyActive)
             ExtraCost=100000000;
         else
             ExtraCost=0;
     }

     function PostBeginPlay()
     {
         if (bInitiallyActive)
             ExtraCost=100000000;
         else
             ExtraCost=0;
     }

## Related Topics

- Artificial Intelligence

Category Custom Class

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