title: How to make sprite not collide with another sprite but only with player. Phaser 3 and matter js
body: <p>Big story short: I'm using matter js with phaser3 and I have a player, platform, saw and tree. Like in a regular platformer, the saw should be halfway between the ground and the air/space.
  <a href="https://i.stack.imgur.com/DBOC4.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/DBOC4.png" alt="enter image description here" /></a></p>
  <p>The problem is that the platform is a physics body, and so is the saw. The player has to collide with the saw, a tree, the platform. And the saw needs to collide with only the player and not the platform. I thought of using collisionfilters, but I don't know which layer to put it on. Any help would be greatly appreciated. The jsfiddle for a  minimal reproducible example is given below. Thanks!</p>
  <p>Jsfiddle: jsfiddle.net/prateek_1/6Lsjf9w4/29</p>