How to return the previous state of an object after using Physics2D.IgnoreCollision?

Question

C++ / C#

I ran into such a problem that the Physics2D.IgnoreCollision, Physics2D.GetIgnoreCollision, Physics2D.IgnoreLayerCollision tags work only in one direction and I don’t know, in fact, how you can return the previous state of the object when it reacts to all collisions. Or do I need to change the script scheme?

Answer 1

IgnoreCollision can be reset by turning off the collider, as it is written in the documentation:
IgnoreLayerCollision apparently changes the interaction matrix of layers, and it cannot be canceled so easily. Either remember what you ignored, or save the entire matrix with GetIgnoreLayerCollision and GetLayerCollisionMask , and overwrite the current matrix in its entirety when needed.
You can also destroy everything in layers and transfer either moving objects between layers, or obstacles. IgnoreCollision is more of a crutch for special situations, you should not use it everywhere.