UnrealScript Game Programming Cookbook

AI and Navigation

142

NavigationHandle.SetFinalDestination

(NavigationHandle.PathCache_GetGoalPoint());

// The random point is any area within the NavMesh

FinalDest = NavigationHandle.

FinalDestination.Position;

// Draw the line to our pawn

DrawDebugLine(Pawn.Location, FinalDest,255,0,0,true);

/** Draw a red sphere to illustrate the next location

the bot

will stop at */

DrawDebugSphere(FinalDest,16,20,255,0,0,true);

The debug information is now drawn on screen so that we can see where our bot will

go. This visualization makes it far easier to understand if our bot is handling our code

correctly or not, especially the pathfinding.

5. The following code represents what goes on behind the scenes, or within our bot's
   mind as it is looking for a new path. All of the pathfinding code is as follows:
   // While our bot hasn't reached the random point yet...
   while(!pawn.ReachedPoint(FinalDest, none))
   {
   /* If the bot realizes it can't reach this point
   directly.../

if(!NavigationHandle.PointReachable(FinalDest))

{

// Get out of here and pick another point

break;

}

// Otherwise...

else

{

// Move to the random point

MoveTo(FinalDest);

}

// Rest for (X) seconds before picking a new point

Sleep(0.5);

}

// Start from the beginning again

goto 'Begin';

}

}