Having issues with AI Health Bars

[hornfreak]

Hello,

My team and I are working on a project with multiple AI on the screen at one time. I've set up a health bar to display over their heads. I've accomplished this by creating a new socket above their head, and attached an empty actor to it (that will display their health @ run time). Also should note that currently we have 3 different types of AI, and 2/3 are extended from the first. The health bar shows up exactly as I want it to for the base AI, but for the other two, one shows up far away from the AI on screen, and the 3rd doesn't show up at all. Also when there are multiple AI of the 2nd and 3rd type, the health bars do not show up at all.

Here's a link to a screen grab of what I was talking about. Note that the health bar that looks like its pinned to the floor stays at that position no matter the camera position/rotation.
http://imgur.com/sCVcMXo
Thanks!

Empty Health Bar Actor:

class HealthBarActor extends Actor;


defaultproperties
{
}

Base AI:

class Turtle extends Pawn placeable;

var HealthBarActor HBActor;
var bool bTouchSnowCheck;
var bool bSlowDown;
var bool IsFullySlowed;
var float speed;
var float halfSpeed;

event PostBeginPlay()
{
    local Vector loc;
    local Rotator myRot;
    Super.PostBeginPlay();
    GetALocalPlayerController().myHUD.AddPostRenderedActor(self);
    if(Mesh != none && Mesh.GetSocketByName('HealthBarSocket') != none)
    {
        Mesh.GetSocketWorldLocationAndRotation('HealthBarSocket',loc, myRot);
        HBActor = Spawn(class'HealthBarActor',,,loc, myRot);
        if(HBActor != none)
        {
            HBActor.Setbase(self,,Mesh,'HealthBarSocket');
        }
    }
}

Simulated event PostRenderFor(PlayerController PC, Canvas Canvas, Vector CameraPosition, Vector CamerDir)
{
    local Vector ScreenPos;
    ScreenPos = Canvas.Project(HBActor.Location);
    Canvas.SetPos(ScreenPos.X - 50, ScreenPos.Y);
    Canvas.SetDrawColor(0, 255, 0);
    Canvas.DrawRect(Health, 10);
}

event TakeDamage(int Damage, Controller InstigatedBy, vector HitLocation, vector Momentum, class<DamageType> DamageType, optional TraceHitInfo HitInfo, optional Actor DamageCauser)
{
    if (Health - Damage < 0)
    {
        WorldInfo.Game.Broadcast(self, "Turtle is Dead!");
        Destroy();
    }
    else
    {
        PlaySound(SoundCue'KismetGame_Assets.Sounds.Turtle_Death_Cue');
        Super.TakeDamage(Damage, InstigatedBy, HitLocation, Momentum, DamageType, HitInfo, DamageCauser);
    }
}

event Touch( Actor Other, PrimitiveComponent OtherComp, vector HitLocation, vector HitNormal )
{

    if(Other.IsA('CloudPawn')) 
    {
        if(bSlowDown == false)
        {
			bSlowDown=true;
			WorldInfo.Game.Broadcast(self, "bSlowDown is true");
			bTouchSnowCheck = true;
			SlowSpeed();
        }
    }
}

event UnTouch(Actor Other)
{
	bSlowDown=false;
	WorldInfo.Game.Broadcast(self, "bSlowDown is false");
}


function SlowSpeed()
{
    if(bTouchSnowCheck && GroundSpeed >= halfSpeed && bSlowDown)
    {
		if(GroundSpeed == halfSpeed)
		{
			GroundSpeed = halfSpeed;
		}
	
    }
}

defaultproperties
{
    GroundSpeed=+0150.0000
    halfSpeed=+0075.0000
    ControllerClass=class'TurtleAI' 
    bTouchSnowCheck = false
    bSlowDown=false
    Begin Object Name=CollisionCylinder
        CollisionRadius=+0034.000000
        CollisionHeight=+0034.000000
        BlockZeroExtent=FALSE
    End Object
    
    Components.Remove(Sprite)
    
    Begin Object Class=SkeletalMeshComponent Name=NanoPawnMesh
    SkeletalMesh=SkeletalMesh'WN_Package.SkeletalMesh.Turtle'
    AnimSets(0)=AnimSet'WN_Package.Anims.Turtle_Anims'
    AnimTreeTemplate=AnimTree'WN_Package.Anims.Turtle_AnimTree'
    BlockZeroExtent=TRUE
    BlockNonZeroExtent=TRUE
    CollideActors=TRUE
    BlockRigidBody=TRUE
    RBChannel=RBCC_Pawn
    RBCollideWithChannels=(Default=TRUE,Pawn=TRUE,DeadPawn=TRUE,BlockingVolume=TRUE,EffectPhysics=TRUE,FracturedMeshPart=TRUE,SoftBody=TRUE)
    bIgnoreControllersWhenNotRendered=TRUE
    End Object
    Mesh=NanoPawnMesh
    Components.Add(NanoPawnMesh)
}

2nd AI:

class BombTurtle extends Turtle;

event Touch( Actor Other, PrimitiveComponent OtherComp, vector HitLocation, vector HitNormal )
{

    if(Other.IsA('CloudPawn')) 
    {
        if(IsFullySlowed == false)
        {
			bSlowDown=true;
			WorldInfo.Game.Broadcast(self, "bSlowDown is true");
			bTouchSnowCheck = true;
			SlowSpeed();
        }
    }
}

event UnTouch(Actor Other)
{
	bSlowDown=false;
	WorldInfo.Game.Broadcast(self, "bSlowDown is false");
}

function SlowSpeed()
{
    if(bTouchSnowCheck && GroundSpeed >= halfSpeed && bSlowDown)
    {
		if(GroundSpeed == halfSpeed)
		{
			GroundSpeed = halfSpeed;
		}
	
    }
}

defaultproperties
{
	GroundSpeed=+075.0000
	halfSpeed = +037.5000
	ControllerClass=class'TurtleAI' 
	
	Begin Object Name=CollisionCylinder
		CollisionRadius=+0034.000000
		CollisionHeight=+0010.000000
		BlockZeroExtent=FALSE
	End Object
	
	Components.Remove(NanoPawnMesh)
	
	Begin Object Class=SkeletalMeshComponent Name=TurtleBombMesh
	SkeletalMesh=SkeletalMesh'KismetGame_Assets.Anims.SK_TurtleBomb_01'
	AnimSets(0)=AnimSet'KismetGame_Assets.Anims.SK_TurtleBomb_01_Anims'
	AnimTreeTemplate=AnimTree'KismetGame_Assets.Anims.TurtleBomb_AnimTree'
	BlockZeroExtent=TRUE
	BlockNonZeroExtent=TRUE
	CollideActors=TRUE
	BlockRigidBody=TRUE
	RBChannel=RBCC_Pawn
	RBCollideWithChannels=(Default=TRUE,Pawn=TRUE,DeadPawn=TRUE,BlockingVolume=TRUE,EffectPhysics=TRUE,FracturedMeshPart=TRUE,SoftBody=TRUE)
	bIgnoreControllersWhenNotRendered=TRUE
	End Object
	Mesh=TurtleBombMesh
	Components.Add(TurtleBombMesh)
}

3rd AI:

class Snake extends Turtle placeable;

event Touch( Actor Other, PrimitiveComponent OtherComp, vector HitLocation, vector HitNormal )
{

    if(Other.IsA('CloudPawn')) 
    {
        if(IsFullySlowed == false)
        {
			bSlowDown=true;
			WorldInfo.Game.Broadcast(self, "bSlowDown is true");
			bTouchSnowCheck = true;
			SlowSpeed(); 
        }
    }
}

event UnTouch(Actor Other)
{
	bSlowDown=false;
	WorldInfo.Game.Broadcast(self, "bSlowDown is false");
}


function SlowSpeed()
{
    if(bTouchSnowCheck && GroundSpeed >= halfSpeed && bSlowDown)
    {
		if(GroundSpeed == halfSpeed)
		{
			GroundSpeed = halfSpeed;
		}
	
    }
}

defaultproperties
{
    GroundSpeed=+0350.0000
    bTouchSnowCheck = false
	halfSpeed=+0175.0000
    Components.Remove(NanoPawnMesh)
    
    Begin Object Class=SkeletalMeshComponent Name=SnakePawnMesh
    SkeletalMesh=SkeletalMesh'KismetGame_Assets.Anims.SK_Snake'
    AnimSets(0)=AnimSet'KismetGame_Assets.Anims.SK_Snake_Anims'
    AnimTreeTemplate=AnimTree'KismetGame_Assets.Anims.Snake_AnimTree'
    BlockZeroExtent=TRUE
    BlockNonZeroExtent=TRUE
    CollideActors=TRUE
    BlockRigidBody=TRUE
    RBChannel=RBCC_Pawn
    RBCollideWithChannels=(Default=TRUE,Pawn=TRUE,DeadPawn=TRUE,BlockingVolume=TRUE,EffectPhysics=TRUE,FracturedMeshPart=TRUE,SoftBody=TRUE)
    bIgnoreControllersWhenNotRendered=TRUE
    End Object
    Mesh=SnakePawnMesh
    Components.Add(SnakePawnMesh)
}

[caseyholcomb]

I noticed that u have placeable set inside of these classes, possibly try spawning them in with kismet

[hornfreak]

Thanks for the suggestion caseyholcomb, but removing the placeable call didn't do anything. Still getting the same bug as before. I did however forget to list some warnings I get in the console during runtime:

ScriptWarning: Accessed None 'HBActor'
	BombTurtle Hudson_Test.TheWorld:PersistentLevel.BombTurtle_0
	Function wateringnature.Turtle:PostRenderFor:004E
ScriptWarning: Accessed None 'HBActor'
	Snake Hudson_Test.TheWorld:PersistentLevel.Snake_0
	Function wateringnature.Turtle:PostRenderFor:004E

It seems to be saying there is something wrong with what I have in my PostRenderFor function. Does anyone know what '004E' is in reference to?

PS this was from a small level I have set up for testing. In it, one unit of each type of AI is spawned into the level via kismet.

[tegleg]

004E is irrelevant
look at what the warning is telling you

Accessed None 'HBActor' - means HBActor does not reference an actor
Function wateringnature.Turtle:PostRenderFor - this is the function it has a problem with

so looking in that function for HBActor i see this line

ScreenPos = Canvas.Project(HBActor.Location);

to fix this make HBActor an actual reference to an actor that exists in the world

[hornfreak]

Thanks for the advice tegleg. Can you elaborate on what you mean by 'actual reference to an actor'? I tried creating another two empty actors and simply copy/paste the stuff from turtle into the other 2 scripts replacing the empty actor reference w/ a new one. That didn't work, still got the warning, just with a different name for the new empty actor. I also tried placing everything inside my game script, and just made it reference any actor of type turtle in the level for what to attach it to. Not only did that not work, but nothing showed up after that.

When you say make an actual reference, do you mean typing something like, "WorldInfo.Game.HealthBarActor"?

[juanitudev1]

Look at the error:

Accessed None 'HBActor'

Which means that your var 'HBActor' is equal to 'None,' which means it does not have a reference to the actor that it should. So when you are trying to Project the actors location in your PostRender function, you get an error - you cannot reference the Location of an actor that does not exist.

Make sure that you set the reference to HBActor correctly and that it is constantly updated. In your PostRender function, you need to add this additional check so that this error is not capable of even occurring in the first place.

Simulated event PostRenderFor(PlayerController PC, Canvas Canvas, Vector CameraPosition, Vector CamerDir)
{
    local Vector ScreenPos;
    
    if ( HBActor != None ) {
        ScreenPos = Canvas.Project(HBActor.Location);
        Canvas.SetPos(ScreenPos.X - 50, ScreenPos.Y);
        Canvas.SetDrawColor(0, 255, 0);
        Canvas.DrawRect(Health, 10);
    } 
}