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Collision response KILL

by Bojan Vukojevic · in Torque Game Builder · 03/14/2011 (2:21 pm) · 19 replies

Hello,

I created 2 exactly the same objects and turned send and receive collision on them. Collision response is KILL and when they collide both of them are deleted as it was intended. The thing is i would love just to add maybe an explosion or something similar when that happens. I can do it on onCollision event but i would like to skip unnecessary code when i almost have what i need. Is it possible to capture onKILL or onDeleteObject? I looked around and couldn't find anything similar to that. Only thing that could help me is collision response CUSTOM, but i do not have the source and not sure if it is possible in script. Any ideas?
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Torque 3D Owner Lonnie Shaw
#1
03/28/2011 (3:48 am)
The onCollision function is exactly what you need. Set the 'Class' in the 'Scripting' section for your object to whatever you want (in this case it is set to 'myClass'). Then do something like this in scripting:

function myClass::onCollision(%srcObject, %dstObject, %srcRef, %dstRef, %time, %normal, %contacts, %points)
{
Your_Partical_Effect_Code_Here
}



Bojan Vukojevic
Default Studio Name
#2
03/28/2011 (4:06 am)
Thanks for the reply Lonnie. I am using the onCollision now. The thing is with onCollision you catch every collision with every object. For example, if you have a trigger mounted on that object the 2 will collide all the time and onCollision function will be called who knows how many times per sec. I was just hoping that i can just catch the kill "event" and maybe save some performance, because i may end up with quite a few objects at the end. I had some problems with performance earlier and now i try to minimize as much as i can.

Torque 3D Owner Ronny Bangsund
Torque Cheerleaders
#3
03/28/2011 (4:54 am)
Use the supplied parameters to filter out things. %srcObject could also be named %this. %dstObject is the object being collided with. Using a custom response you can skip processing for some objects, and start fancier animations and sounds for special cases.

Bojan Vukojevic
Default Studio Name
#4
03/28/2011 (5:00 am)
The problem with CUSTOM is that you can only use it if you have a source code if i understood it right, and i do not have the code. Question is can you use CUSTOM just with script?

Bojan Vukojevic
Default Studio Name
#5
03/28/2011 (6:12 am)
One more thing just to explain it a little beter: when i say CUSTOM i mean colliosionResponse not custom if/switch logics in onCollision funciton. According to TDN you can set few responses (rigid, kill etc etc) and one of them is CUSTOM.

Torque 3D Owner Lonnie Shaw
#6
03/30/2011 (12:42 pm)
Filtering out objects to collide with is where things like setCollisionGroups, setCollisionMasks, and setCollisionLayers come in handy. With these you can limit what an object will collide with based on either it's Group number, the Layer it is on, or based on a Mask (list of objects).

Torque Owner Chris Labombard
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#7
03/30/2011 (12:47 pm)
I could be completely off base here but don't sprites have an onAdd and onRemove callback function? Couldn't you use that?

Bojan Vukojevic
Default Studio Name
#8
03/30/2011 (1:17 pm)
Actually masks and layers could help in my case, i completely forgot about that. And tbh i couldn't see what are you pointing at Chris, but after a min of thinking onRemove could actually be what i am looking for. Unfortunately i looked on tdn briefly and in http://tdn.garagegames.com/wiki/TGB/Reference:_t2dSceneObject_Callbacks i can only see onAdd no on remove.

Atm i'm using onCollision but if i get into performance problems i think i will use masks and layers.

Thanks for the help guys :)

Torque Owner Chris Labombard
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#9
03/30/2011 (1:19 pm)
When an object is added to a scene an onAdd callback is called on the object.

I was under the impression that an onRemove was called as well, just before the object was deleted. If one is called then that is exactly what you are looking for.

Torque Owner Chris Labombard
Premium Preferred
#10
03/30/2011 (1:22 pm) 
void TickableScriptObject::onRemove()  
{  
   // Call onRemove in script!  
   Con::executef(this, 2, "onRemove", Con::getIntArg(getId()));  
   Parent::onRemove();  
}

I'm pretty sure it does call onRemove. Try this:

new t2dStaticSprite() {class="myObject";... etc.};

function myObject::onRemove(%this)
{
   echo("IT WORKED");
}

Bojan Vukojevic
Default Studio Name
#11
03/30/2011 (1:25 pm)
Heh i just tried onRemove and it works :) Of to do some changes...

Torque Owner Chris Labombard
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#12
03/30/2011 (1:26 pm)
boo yah!

Bojan Vukojevic
Default Studio Name
#13
03/30/2011 (1:30 pm)
i owe you a beer :)

Torque Owner Chris Labombard
Premium Preferred
#14
03/30/2011 (4:28 pm)
and one day we will meet and you will owe me said beer.... You don't happen to be from Canada, do you? :D

Bojan Vukojevic
Default Studio Name
#15
03/31/2011 (12:58 am)
well i'm not that far. i just need to cross half of Europe and the Atlantic but is relatively near if you consider that beer is involved :)

Torque 3D Owner Lonnie Shaw
#16
03/31/2011 (3:03 am)
Pssst...Bojan

If you like anything stronger, or with a fuller flavor than a Lager bring your own Beer! ;)

Torque Owner Chris Labombard
Premium Preferred
#17
03/31/2011 (5:41 am)
Why you gotta hate? Besides, us Canadians have a wide range of imported beverages from European countries.

Torque 3D Owner Lonnie Shaw
#18
04/01/2011 (3:22 pm)
Just messin' with ya Chris. Hence the wink ;)

Torque Owner Chris Labombard
Premium Preferred
#19
04/01/2011 (3:23 pm)
I know :)