Ignore collisions between two physics objects

I just tried, and they didn’t seem to work.
Also, here is a playground: https://www.babylonjs-playground.com/#Z0QW21#26
Aim at a 45 degree angle up, and the sphere hits the cylinder physics impostor. shammo is the sphere, player0 is the cylinder.

And, add in question. can I use shammo.intersectsMesh(ground0, true); with it working? When the sphere hits the plane you get moved to where it hit. but it freezes the plaground when un-annotated.
It is in the render loop already.

Thanks for the help!

Givo