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Alpha 3b Collision Bug?

by Toby Mckenzie · in Torque Game Builder · 01/31/2006 (3:05 am) · 7 replies

I have a situation where I have a number of sprites (shot gun pellets), being fired towards an enemy sprite (zombie). The shotgun pellets have a collision response of Kill and in the onCollision callback the enemy sprite (zombie) is deleted. What I am seeing is that the shotgun pellets are not being killed / deleted when the collide with the enemy sprite, if the enemy is deleted within the onCollision, i.e

function t2dSceneObject::onCollision(%srcObj,%dstObj,%srcRef,%dstRef,%time,%normal,%contactCount,%contacts)
{

   if (%srcObj.tag $="playerBullet" && %dstObj.tag $="zombie")
   {
      %dstObj.safeDelete() ;
      %srcObj.safeDelete() ;      
   }
}

However if I do not delete the the zombie sprite i.e:

function t2dSceneObject::onCollision(%srcObj,%dstObj,%srcRef,%dstRef,%time,%normal,%contactCount,%contacts)
{

   if (%srcObj.tag $="playerBullet" && %dstObj.tag $="zombie")
   {
      %srcObj.safeDelete() ;      
   }
}

Then the shotgun pellets are deleted as I would expect.
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Associate Melv May
#1
01/31/2006 (3:50 am)
I'll have a look a this a little later today and try to confirm the problem.

Thanks for the report Toby,

- Melv.

Associate Melv May
#2
01/31/2006 (4:57 am)
Just one question; why are you deleting the projectiles in the callback when the collision response for it is kill anyway. This shouldn't affect things but it does seem a strange thing to do.

- Melv.

Torque Owner Toby Mckenzie
#3
01/31/2006 (5:07 am)
Good point, think it is just a legacy (i.e me hacking code) from trying to get the projectiles to delete when they where not getting deleted through the kill response. Also worth noting for your debugging / recreating that the projectiles had a setLifeTime(0.3) on them as well.

Associate Melv May
#4
01/31/2006 (6:10 am)
Okay, thanks. I'll look at it this evening when I get home.

I'll let you know what I find here.

- Melv.

Torque Owner Toby Mckenzie
#5
01/31/2006 (11:22 am)
Looks like I made a mistake somewhere as it appears to be working fine now, changed so much code today though cannot isolate what I was doing wrong.

Associate Melv May
#6
01/31/2006 (11:28 am)
Toby,

That's no problem. If you do find out what was going wrong then by all means post back here and let me know.

Glad it's working for you though. :)

- Melv.

Torque Owner Toby Mckenzie
#7
01/31/2006 (1:20 pm)
Hmm, when I put setCollisionPhysics(false,true) on the projectiles I seemed to get the same behaviour again, comment it out and the problem dissapears. In the onCollision method I am not deleting the projectile, rather relying on the collision response of Kill which does not seem to be happening when the setCollisionPhysics is set as per above.