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Seeker projectile class

by Very Interactive Person · in Torque Game Engine · 10/13/2004 (12:54 am) · 15 replies

I'm using the seeker projectile class from the gamebeavers beaverpatrol demo.
I just added the seekerProjectile.cc and .h to the engine, and those changes alone don't seem to do much. Now I'm guessing I need to set the targets, so what I did is put a shedule on the projectile, and do a radius scan at regular intervals, then set the closest vehicle i find as the target. But, seeker.setTarget(%target) doesn't work. It says there's no such function setTarget(). In the code however i see:

void SeekerProjectile::consoleInit() 
{ 
    Con::addCommand("SeekerProjectile", "setTarget", cSetTarget, "seeker.setTarget(obj)", 3, 3); 
}

Anyone who can help me? Do I need to change something to the engine code? I'm guessing I will have to change something to it, but i haven't got a clue what to do. The scripting part is no problem tough.
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Torque Owner Josh Moore
#1
10/13/2004 (5:54 pm)
I also use the Game Beaver's seekers. You need to replace the old version of the console command with a new one. First, remove that line from consoleInit. Then rplace the static bool setTarget with this:

ConsoleMethod( SeekerProjectile, setTarget, bool, 3, 3, "ShapeBase Target")
{
   ShapeBase* target;
    if (Sim::findObject(argv[2],target)) {
        object->setTarget(target);
        return true;
    }
    else
        object->setTarget(0);
    return false;
}

Torque Owner Very Interactive Person
#2
10/14/2004 (4:03 am)
Hmmz no luck, it keeps saying it doesn't know any setTarget function, so i'm defenetly doing something wrong.

Here's what i have on the script side of things btw:
function checkForTargets(%obj)
{
	error(%obj SPC "is scanning for possible targets");
	InitContainerRadiusSearch(%obj.getTransform(), 20, $TypeMasks::ShapeBaseObjectType);
	%dist=50;
	%target=0;
	while ((%targetObject = containerSearchNext()) != 0) {
		if(%targetObject != %obj.sourceObject){
			%tempDist = vectorDist(%targetObject.getTransform(), %obj.getTransform());
			if(%tempDist<%dist){
				%dist=%tempDist;
				%target=%targetObject;
			}
		}
	}
	%obj.setTarget(%target);
	error("locked on to" SPC %target);
	schedule(1000,%obj,"checkForTargets",%obj);      
}
Does this look like alright to you?

Anyway, would you mind just passing your cc and h file to me? I could trade them for some artwork like skyboxes or something like that if you want.

Torque Owner Josh Moore
#3
10/14/2004 (4:32 pm)
I don't see anything wrong with that function. Did you make sure that you replaced this function with the console method?

static bool cSetTarget(SimObject *ptr, S32, const char **argv)

Torque Owner Very Interactive Person
#4
10/15/2004 (2:57 am)
Yep, I did... that function is no longer there, and the new function was added. Compiled it, replaced the exe, but I still get console warnings there's no setTarget function available.

Torque Owner Very Interactive Person
#5
10/19/2004 (2:41 am)
Turns out it was just me... made a little mistake in the scripts. So its working now.

The only thing with them is that my projectiles fly backwards (they're rockets, and they fly with the rocketengine to the front sometimes). I use the same models for regular projectiles and as far as I know it doesn't do that for regular projectiles.
Also, for some strange reason they sometimes stop in mid air (even tough they're locked on to a target nearby), and just hang there... till they fade out. Is this a problem with my settings, or are you experiencing similar things?

Torque Owner David Tan
#6
10/25/2004 (11:17 pm)
I would be very interested in this.Why not make it a new resource?thanks.

Torque Owner Very Interactive Person
#7
10/26/2004 (2:46 am)
Everything you need to get them to work the same as they do in my game (wich isn't 100% flawless as you can see in my last post above) is in this thread.
Get the files from gamebeavers, replace the console command function just like Josh said, and you can use the script I posted above for scanning.

Torque Owner David Tan
#8
10/28/2004 (11:45 pm)
Thanks your reply.Is it put the scanning function in the MissileLauncherImage::onFire()?I try it for two days,but I could not make it work.

Torque Owner Very Interactive Person
#9
10/29/2004 (2:40 am)
Putting a function inside a function? No, just add the function to your weapon script file... and in OnFire, after you created the projectile (%p in my example), you add this line: 
schedule(200,%p,"checkForTargets",%p);

Torque Owner David Tan
#10
10/29/2004 (6:21 am)
Thanks,It works.But it is not easy to lock target,could other ways to fix it?

Torque Owner Very Interactive Person
#11
10/29/2004 (6:28 am)
Just play around with the settings of your seekerprojectile, and with the scan settings (change the 20 to 80 for example)...

And another ways? Sure there are other ways...

Torque Owner David Tan
#12
10/29/2004 (6:43 am)
Thanks for quick reply.This is the function in the file MissileLauncher.cs that I used.
function MissileLauncherImage::onFire(%this, %obj, %slot)
{
   // %target = %obj.getLockedTarget(%slot);  
    %projectile = %this.projectile;
    %obj.decInventory(%this.ammo,1);
    %muzzleVector = %obj.getMuzzleVector(%slot);
    %p = new (%this.projectileType)() {
        dataBlock        = %projectile;
        initialVelocity = VectorScale(%muzzleVector, %projectile.muzzleVelocity);
        initialPosition = %obj.getMuzzlePoint(%slot);
        sourceObject = %obj;
        sourceSlot = %slot;
        client = %obj.client;
     //   target = %obj.getLockedTarget(%slot);
    };

    schedule(200,%p,"checkForTargets",%p); //add

    MissionCleanup.add(%p);
    return %p;
}
function checkForTargets(%obj)
{
 ...
}

I notice a function "getLockedTarget",But I can't find it in engine.

Associate Joseph Euan
#13
10/29/2004 (8:20 am)
Where can I download the beaverpatrol code?

Sorry for going on the main subject.

Torque Owner David Tan
#14
10/29/2004 (3:05 pm)
DOWNLOAD BEAVER PATROL 1.3 ALPHA:

http://www.gamebeavers.org/modules.php?op=modload&name=Downloads&file=index&req=getit&lid=24

Torque Owner Derk Adams
#15
12/10/2004 (8:53 am)
Greetings,

I was frustrated with the difficulty in getting the Game Beaver's code so I made a resource for Guided or Seeker Projectiles.

It doesn't have all the bells and whistles of the GB code (i.e. it doesn't lose and find targets), but it is simple to implement.

Thanks.