Detect Collision Energy of RigidBody2D Collision

jgrauman

Hi,

I was wondering if anyone knew of an easy way to determine (or calculate) how much energy was transferred via a collision of two RigidBody2D nodes. I would like to calculate damage if something slams hard into something vs just barely bumps into it...

Thanks for any ideas!

Josh

Megalomaniak

Hmm, never looked into it, but I guess you could track some metadata of your relevant nodes such as mass, velocity and direction and on collision calculate something from that? To my mind it should certainly be possible.

If there is an easier way, maybe someone else knows? Would be interesting to know for sure.

jgrauman

Is there a way to connect a signal to right before the collision is processed? That way I wouldn't have to store velocity, I could just check it right before it happens and calculate everything there.

jgrauman

Actually, it's not exactly strictly before, but on_body_entered does get called more or less before the collision is done. I can get velocity and mass of the two bodies then, and I get a good enough calculation of energy.