Disable collision in OnCollisionEnter without changing velocity of the colliding rigidbody

I have my player that collides with a platform and if the player is below that platform I want to disable the platform and let the player get on top.

Simple, if I ignore how to enable the collider again for now:

Code (CSharp):

1.     private void OnCollisionEnter2D(Collision2D collision)
2.     {
3.         if (collision.collider.CompareTag("Platform"))
4.         {
5.             float platformTop = collision.collider.bounds.center.y + collision.collider.bounds.extents.y;
6.             float playerBottom = col.bounds.center.y + col.bounds.extents.y;
7.  
8.             if (platformTop > playerBottom)
9.                 Physics2D.IgnoreCollision(collision.collider, col, true);
10.         }
11.     }

Now if I jump with the player against the platform from below it disables it just like I want it to.
The Problem is that when that happens the velocity of the rigidbody on my player is still changed to 0 vertically because it hit a ceiling.

I've tried disabling the collision with:

Code (CSharp):

1.     collision.collider.enabled = false;
2.     collision.collider.isTrigger = true;

but the same problem still occurs.


Is there any way to fix this? Can i execute code before the velocity is changed? Or can I prevent a change of velocity in this frame?
Or do I simply have to work around this?


Thank you for any answers

 

poggers thank you, that what i wanted to know