Velocity of projectile on collision or impact
by gamer · in Torque Game Engine · 07/26/2006 (3:47 pm) · 8 replies
Is there a way to get the velocity of a projectile on collision with a player?
I looked into
Player::updatePos() where it calls onImpact(), however it seems that only player's impact velocity is given, not the projectile's impact velocity.
the mVelocity printed is rather small, it never goes above minImpactSpeed, so onImpact never gets called. but I am firing a very high speed bullet onto the player.
1. is there a way to get the bullet's impact velocity from the Player::updatePos()?
2. if not, should I be looking into if weapon or projecile related class has an onImpact method? can someone point me to the right file?
thanks
I looked into
Player::updatePos() where it calls onImpact(), however it seems that only player's impact velocity is given, not the projectile's impact velocity.
//taken from Player::updatePos which is too long to post.
Con::printf(" mVelocity = %g %g %g, minImpact = %g, this one = %g, normal = %g %g %g", mVelocity[0],mVelocity[1],mVelocity[2], mDataBlock->minImpactSpeed, bd, collision->normal);
if (bd > mDataBlock->minImpactSpeed && !mMountPending) {
if (!isGhost())
onImpact(collision->object, collision->normal*bd);the mVelocity printed is rather small, it never goes above minImpactSpeed, so onImpact never gets called. but I am firing a very high speed bullet onto the player.
1. is there a way to get the bullet's impact velocity from the Player::updatePos()?
2. if not, should I be looking into if weapon or projecile related class has an onImpact method? can someone point me to the right file?
thanks
About the author
#2
07/26/2006 (5:34 pm)
Thanks! there's a getVelocity in item class. but this getVelocity function is not made into a console method. is there a way to call getVelocity from the console?
#3
projectile in onCollission() in the following code, but it always returns 0 0 0.
any idea what could be wrong?
07/26/2006 (6:15 pm)
I tried calling getVelocity() on the projectile in onCollission() in the following code, but it always returns 0 0 0.
any idea what could be wrong?
void Projectile::onCollision(const Point3F& hitPosition, const Point3F& hitNormal, SceneObject* hitObject)
{
// No client specific code should be placed or branched from this function
if(isClientObject())
return;
if (hitObject != NULL && isServerObject())
{
char *posArg = Con::getArgBuffer(64);
char *normalArg = Con::getArgBuffer(64);
dSprintf(posArg, 64, "%g %g %g", hitPosition.x, hitPosition.y, hitPosition.z);
dSprintf(normalArg, 64, "%g %g %g", hitNormal.x, hitNormal.y, hitNormal.z);
Con::printf("projectile:onCollission velocity is %g %g %g\n",getVelocity().x,getVelocity().y,getVelocity().z); // prints 0 0 0
Con::executef(mDataBlock, 6, "onCollision",
scriptThis(),
Con::getIntArg(hitObject->getId()),
Con::getFloatArg(mFadeValue),
posArg,
normalArg);
}
} 
#4
07/26/2006 (6:17 pm)
Does the velocity vary from launch significantly? If it does not then store that in the projectile on launch and reference on impact.
#5
07/26/2006 (6:21 pm)
Yes the difference between initial and final velocity will be important in my case.
#6
07/26/2006 (7:38 pm)
There is a Point3F in projectile called mCurrVelocity have you tried that?
#7
projectile.processTick() reset the mCurrVelocity before calling onColission, so I moved that line after onColission. and then I add an extra parameter to onCollission to pass the velocity. I am not sure if it will have other side effects but I can't find an easier way.
Also a second issue is that projectile.getVelocity is a private method. Is there a reason why this is not public? I have trouble making it a console method.
07/26/2006 (7:44 pm)
Yeah getVelocity returns mCurrVelocity. The problem I discovered here isprojectile.processTick() reset the mCurrVelocity before calling onColission, so I moved that line after onColission. and then I add an extra parameter to onCollission to pass the velocity. I am not sure if it will have other side effects but I can't find an easier way.
Also a second issue is that projectile.getVelocity is a private method. Is there a reason why this is not public? I have trouble making it a console method.
Torque 3D Owner Jameson Bennett