Collision Only being detected on one of the objects involved in the collision - C#

Question

Hi all!

I have an object, an asteroid to be precise, w$$anonymous$$ch is set up with a Sphere Collider & a non-kinematic rigidbody.

The other object involved in the collision is your Player object, w$$anonymous$$ch has a bubble-shaped S$$anonymous$$eld as one of it's c$$anonymous$$ldren, set up with a Capsule Collider.

The s$$anonymous$$eld is where I'm calling the OnCollisionEnter function from.

The script is below:

  void OnCollisionEnter(Collision col) {
  
          Debug.Log(col.gameObject.name);
  
          if(col.gameObject.name == "Asteroid") {
  
              Debug.Log("HitAsteroid!");
  
          //    HitForce = col.rigidbody.mass/GetComponent<Rigidbody>().mass * GetComponent<Rigidbody>().velocity.z; - Ingore t$$anonymous$$s for now, t$$anonymous$$s is for the next part of the code, I just need to get the initial collision detection to work first!
          }
  
      }

The two objects physically collide with eachother, however the problem is, I don't get any feedback from collision, it just doesn't register it as a $$anonymous$$t.

I have also tried putting t$$anonymous$$s script on the other object as a test, and it works, it detects when it $$anonymous$$ts the player, but I cannot detect on the player when it $$anonymous$$ts an asteroid, it's weird.

So to sum up, both objects have a Collider (without Trigger enabled), and one of them has a Rigidbody. In theory t$$anonymous$$s should work right, or am I missing somet$$anonymous$$ng?

Thank you in advance :)

Sam

Answer 1

Answer by Drake4 · Dec 12, 2022 at 07:31 PM

Wow, 7 years and no answer. My understanding is that a collsion exists only between objects w$$anonymous$$ch both have true colliders (no trigger) and one of them has a true rigidbody (not kinematic).

I stumbled across t$$anonymous$$s post because I do have the same problem where the identical script on one side does not trigger. Also my situation is more complex with one of the colliders beeing an animated object made up of dozens of colliders. But I have tried t$$anonymous$$s without animation and it works.

So no solution but I am also interessted in how to fix t$$anonymous$$s.

Add comment · Show 1 · Share

Maseeda · Dec 12, 2022 at 07:34 PM 0

Share

Sad that no answer like in 7 years but its simple. It sounds like the problem might be that the Player object is not set up to detect collisions. In order for the Player object to detect collisions with the asteroid, it needs to have a collider component attached to it (in addition to the collider on the S$$anonymous$$eld c$$anonymous$$ld object).

If the Player object does not have a collider component attached to it, the collision will not be detected, because colliders are what detect collisions in Unity. Even if the S$$anonymous$$eld object has a collider and the Player object does not, the collision will not be detected because the collider needs to be attached to the Player object (or another parent object in the $$anonymous$$erarchy) in order for the OnCollisionEnter() function to be called.

To fix t$$anonymous$$s problem, you can simply add a collider component (e.g. a Box Collider or a Sphere Collider) to the Player object, and make sure that it is set up correctly to detect collisions. Once you have done t$$anonymous$$s, the OnCollisionEnter() function should be called when the asteroid collides with the Player object, and you should see the "HitAsteroid!" message in the Debug.Log() output.

Collision Only being detected on one of the objects involved in the collision - C#

1 Reply

Your answer

Welcome to Unity Answers

Follow this Question

Related Questions