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Question by heitaoflower · Jan 12, 2016 at 10:03 AM · rigidbody2dphysics2dboxcollider2d

Why collision2d happend earlier in rigidboy2d?

alt text

In the case of a collision between a tank and an obstacle, there is no contact, but a collision2d happend, and what is the reason?

how to avoid it ? PLZ

qq截图20160112161210.png (286.5 kB)
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avatar image heitaoflower · Jan 12, 2016 at 11:36 AM 0
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By the Way, I use box2d to check.

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Answer by heitaoflower · Jan 12, 2016 at 04:58 PM

ok, I will try ,thanks a lot. There is a paper talk about this situaion,just share it.

https://www.iforce2d.net/b2dtut/ghost-vertices

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Answer by lassade · Jan 12, 2016 at 01:51 PM

I made some test,

This happens if the Rigidbody2D.collisionDetectionMode is in Continious mode change it back to Discrete.

Edit: You can use this code to debug, it will pause the game at collision.

 using UnityEngine;
 using System.Collections;
 
 public class PauseOnTouch : MonoBehaviour {
 
     void OnCollisionEnter(Collision collision)
     {
         Debug.Log(System.String.Format("Recived {1} [OnCollisionEnter] from {0}", collision.collider.name, name));
         Pause();
     }
 
     void OnCollisionEnter2D(Collision2D collision)
     {
         Debug.Log(System.String.Format("Recived {1} [OnCollisionEnter2D] from {0}", collision.collider.name, name));
         Pause();
     }
 
     static void Pause()
     {
         //Debug.DebugBreak();
         Debug.Break();
     }
 }

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