Question by Brendtron5000 · Oct 31, 2013 at 07:40 PM · physics force explosion addexplosionforce

AddExplosionForce only goes up

I've got a projectile that explodes when it hits any collider. The problem is that it only seems to produce force in the +y direction. I've tried leaving out the upwardsModifier and setting it to zero. Neither helped. My code:

 Vector3 explosionPos = transform.position;
 Collider[] colliders = Physics.OverlapSphere (explosionPos, radius);
 foreach(Collider hit in colliders) 
 {
 if (!hit)
     continue;
 
 if (hit.rigidbody)
 {
     if(hit.rigidbody != this.rigidbody)
     {
         hit.rigidbody.AddExplosionForce(power, explosionPos, radius);
         Debug.Log(hit);
     }
 }
 }

I can see that it's hitting the correct collider from the debug statement.

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robertbu · Nov 01, 2013 at 12:02 AM 1

As a start between lines 11 and 12, insert:

 Debug.DrawRay(transform.position, hit.transform.position - transform.position, Color.red, 5.0);

The red line will display for 5.0 seconds and should be aligned with the explosion force. This will allow you to visualize your geometry to make sure it is as you expect.

Brendtron5000 · Nov 01, 2013 at 07:14 AM 0

The red line is going from the point of impact to the center of the collider for the hit object. That is where I would like the explosion to force to head, but I don't think it's actually doing that. AddExplosionForce is mysterious...

robertbu · Nov 01, 2013 at 03:51 PM 0

As a text, replace your AddExplosionForce() with:

 hit.rigidbody.AddForce((hit.transform.position - transform.position).normalized * 100.0f);

If this also does not work, check to see if your object is colliding with anything or if a script on the individual objects is impacting movement. For example freezing x and z movement of the rigidbody would cause this behavior.

Brendtron5000 · Nov 13, 2013 at 07:21 PM 0

Yes, I am freezing movement in the z axis. I will try turning that off to see how it reacts. If freezing the z axis is causing the problem I'll have to apply forces manually.

AddExplosionForce only goes up

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