Character pushing each other (ARG!)

I'm about to give up, I tried everything and I spent days on this forum and google trying to find a solution to something that should be plain simple; make sure characters don't push each other.

The problem;

1) Have players, enemies, invaders, supporters and non-playing characters. Each with their own layers so they can attack and damage each other.
2) All of them should not push each other. Even an enemy cannot push another enemy.
3) They cannot cross each other. An enemy should collide with another enemy.

Changing weight does nothing, there's always one lighter who get pushed.

I tried adding a children with a larger kinematic collider... it works, but characters on the same layer cross each other.
If I put that kinematic collider on a layer that everybody collide with, the character collide with is own children and is send flying. Any way to prevent this? Make a rigidbody ignore its children?

 

Just use Physics.IgnoreCollision() (there is a Physics2D version as well). It's for ignoring collisions between two specific colliders, even if they are on interacting layers. Put it in Start() for each actor.

 

What the... How did I never saw that method after spending so much time in the Physics class?
That sounds amazing. Testing that right away.

EDIT: It is amazing and works perfectly! Thanks!

 

wow thx! this saved my day!

 

Hyblademin, you're an f-ing saint

 

Excellent trick, thanks! Instead of Physics.IgnoreCollision(), you can also use more layers. Let's take the minimal example of two layers A and B. The A-A and the B-B interactions should work normally, but in the A-B interactions, we don't want B to move. To do that, add a kinematic children Rigidbody to the B objects like you suggest, but assign the subobject the layer C. Then in the player physics settings, in the layers matrix, pick the correct combination: we want to select A-A and B-B and A-C, but none of the other combinations of A, B or C.