detection of intersections without collisions

[SCH]

Hello. The task is to make objects that will not collide with each other, but at the same time trigger the collision start event. Now I have disabled the collision in this way:

this.char.setCollisionGroup(1)
this.char.setCollidesWith(0)

this.lama.setCollisionGroup(2)
this.lama.setCollidesWith(0)

using matter physic engine. 

How to implement it