Cannon JS Collision detect amount of force

Question

I have two Cannon.js Objects, and have attached the "collide" event listener to both.

carBody.addEventListener("collide",function(e){
});

I want to be able to react differently depending on how much force the collision has is there a way to do this?

What have you tried so far? We are not a code writing service. Please refer to [How to ask a good question?](https://stackoverflow.com/help/how-to-ask). — GrumpyCrouton, Jun 15 '17 at 19:10

score 5 · Answer 1 · answered Jun 16 '17 at 18:14

You can get the relative velocity in the contact point to determine the amount of energy in the collision. Example:

carBody.addEventListener("collide",function(e){
    var relativeVelocity = e.contact.getImpactVelocityAlongNormal();
    if(Math.abs(relativeVelocity) > 10){
        // More energy
    } else {
        // Less energy
    }
});

Cannon JS Collision detect amount of force

1 Answers1