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Get stuck in AiPlayer's onMoveStuck() method :(

by Christin Stock · in Torque Game Engine · 07/19/2009 (7:15 pm) · 3 replies

hi,I have modified the aiPlayer.cpp to fire an "onMoveStuck()" callback, as follows, and the mStuckTolerance is set to 0.01f.

// We should check to see if we are stuck...

//if (location == mLastLocation) {
// throwCallback("onMoveStuck");
// mMoveState = ModeStop;
//}

//new callback for onMoveStuck
F32 xDiffLast = mFabs(mLastLocation.x - location.x);
F32 yDiffLast = mFabs(mLastLocation.y - location.y);
F32 zDiffLast = mFabs(mLastLocation.z - location.z);
if ( xDiffLast< mStuckTolerance && yDiffLast < mStuckTolerance && zDiffLast < mStuckTolerance)
{
mMoveState = ModeStuck;
throwCallback("onMoveStuck");
}
else
{
mLastLocation = location;
}

it does work well! but what really bothers me is how to help the ai get out of stuck. I thought it was easy, define 8 movement offside directions in an array and try to setMoveDestination() of each offside direction in turn, so I wrote my onMoveStuck() (a datablock method) in aiplayer.cs file like this:

$stuckOffsideRadius = 10 ;
$cardinalDirection[0] = "0" SPC $stuckOffsideRadius SPC "0"; // N
$cardinalDirection[1] = $stuckOffsideRadius SPC $stuckOffsideRadius SPC "0"; // NE
$cardinalDirection[2] = $stuckOffsideRadius SPC "0" SPC "0"; // E
$cardinalDirection[3] = $stuckOffsideRadius SPC -$stuckOffsideRadius SPC "0"; // SE
$cardinalDirection[4] = "0" SPC -$stuckOffsideRadius SPC "0"; // S
$cardinalDirection[5] = -$stuckOffsideRadius SPC -$stuckOffsideRadius SPC "0";// SW
$cardinalDirection[6] = -$stuckOffsideRadius SPC "0" SPC "0"; // W
$cardinalDirection[7] = -$stuckOffsideRadius SPC $stuckOffsideRadius SPC "0"; // NW
$NUM_CARDINALS = 8;

...

function DemoPlayer::onMoveStuck(%this)
{

if( %this.stuckTurningDirection $="" )
{
%this.stuckTurningDirection = 0;
}

if( %this.stuckTurningDirection >=8 )
{
%this.stuckTurningDirection = 0;
}

%newpos = vectoradd(%this.getPosition(),$cardinalDirection[%this.stuckTurningDirection]);
%this.SetMoveDestination(%newpos,false);
%this.stuckTurningDirection++;
}

in most cases, when my ai gets in stuck, it just turns its face to a offsie direction in turn but without a move! I think it maybe still stuck in the same place. Is there anything relate to the processtick() defined in player.cpp? in a tick timespan, the ai cannot have a movement offside bigger than mStuckTolerance, so it still in stuck??
I am not sure. do you have any ideas?
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Torque Owner Bryce
Toy Story 2 was O.K.
#1
07/19/2009 (9:44 pm)
My stuck avoidance looks like:

%speed = 700;
    %vector = getRandom(-1,1) SPC getRandom(-1,1) SPC "0";
    %pushVector = VectorScale(%vector,%speed); // The vector we should push ourselves in order to get free
    %player.applyImpulse(%plr.getPosition(),%pushVector);

It "nudges" the player in a random direction to get un-stuck

Torque Owner Christin Stock
#2
07/19/2009 (9:52 pm)
thanks bryce!
Finally I find it is a bug in my ai task schedule method which results in the above ai's weird behaviour. I will give a shoot of your suggestion.

Torque Owner Bryce
Toy Story 2 was O.K.
#3
07/20/2009 (5:21 am)
I recommend raising the value of minImpactSpeed in the AI Player's datablock if you use my system...it's been known to injure them depending on where they are.