Reset a collider during runtime to lose previous Physics.IgnoreCollision() calls

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I need this functionality for re-using pooled projectiles.

In this post: https://forum.unity.com/threads/clear-ignored-collisions-set-in-physic-ignorecollsion.346846/#post-2243944 The poster says "Just deactivate and reactivate the collider", however setting BoxCollider.enabled to false then true again does not make the projectile forget previous Physics.IgnoreCollision() calls.

What other way is there to deactivate and reactivate the collider? Is there another way to lose previous Physics.IgnoreCollisions() calls?

Answer 1

Best Answer

Answer by Incode · Oct 30, 2019 at 11:35 PM

As I understand it, that post is suggesting that you disable the collider and enable it when you want to use it, as opposed to using Physics.Ignore collision. That is a valid option.

Alternatively just cache the two colliders you were ignoring, and call Physics.IgnoreCollision(collider1, collider2, false) to re-enable their collisions.

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Kikbow · Oct 30, 2019 at 11:39 PM 0

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I wouldn't want the global disable since I only want to ignore specific collisions: "projectile with its owner" and "monster's projectile with other monsters".

I'm working on the cache right now, just hoping it isn't expensive.

Since I want to completly reset IgnoreCollisions I was hoping there would be a one-size-fits-all reset function that would be lighter than undoing all of them one-by-one.

Kikbow · Oct 30, 2019 at 11:46 PM 0

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Here's what I'm using now:

         void OnCollisionEnter(Collision col)
             {
                 // Never collide with owner
                 if (ReferenceEquals(col.gameObject, owner))
                 {
                     ignoredColliders.Add(col.collider);
         
                     if (colliderBox)
                         Physics.IgnoreCollision(col.collider, colliderBox);
                     else
                         Physics.IgnoreCollision(col.collider, colliderCapsule);
                     return;
                 }
         
                 // Ignore monster friendly fire
                 else if (col.collider.tag.Equals("$$anonymous$$onster") && owner.tag.Equals("$$anonymous$$onster"))
                 {
                     ignoredColliders.Add(col.collider);
         
                     if (colliderBox)
                         Physics.IgnoreCollision(col.collider, colliderBox);
                     else
                         Physics.IgnoreCollision(col.collider, colliderCapsule);
                     return;
                 }
         }

and then:

                 if (colliderBox)
                 {
                     while(ignoredColliders.Count > 0)
                     {
                         Physics.IgnoreCollision(ignoredColliders[ignoredColliders.Count - 1], colliderBox, false);
                         ignoredColliders.RemoveAt(ignoredColliders.Count - 1);
                     }
                 }
                 else if(colliderCapsule)
                 {
                     while (ignoredColliders.Count > 0)
                     {
                         Physics.IgnoreCollision(ignoredColliders[ignoredColliders.Count - 1], colliderCapsule, false);
                         ignoredColliders.RemoveAt(ignoredColliders.Count - 1);
                     }
                 }

Kikbow · Oct 30, 2019 at 11:50 PM 0

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Seems to work well enough, I realise now I'm probably over-estimating how often I need to ignoreCollisions() so this will hopefully not slow down my game.

Reset a collider during runtime to lose previous Physics.IgnoreCollision() calls

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