title: How to get contact points from a trigger?
body: <p>I'm in a situation where I need a 2d sensor that will not collide but will also give me contact points for a collision.</p>
  
  <p>Triggers don't give me contact points and colliders give me contact points but cause a collision.</p>
  
  <p>I've tried disabling collisions when using colliders in the hopes of getting a collision enter callback but not having the collision actually occur, but no luck.</p>
  
  <p>So how do I get contact points from a trigger? Or how do I get a collision callback with rigidbodies without causing a collision?</p>
  
  <p>Basically I have a circle that I want to act as radar, but I'd like it to be fairly accurate with contact points too.</p>