Explosion on collision at a certain velocity

Hi guys, I was just wondering how I could keep track of a rigidbody's velocity and check to see if it's hit anything.

I think it would work somewhat like this in pseudocode.

if(rigidbody.velocity >= someVelocity && (Some way to check collision))
{
DoExplosion();
}

Please forgive my ignorance on the topic. That's why I'm here though.

I suppose the question is how do I check for collision against anything?

Any help and/or input is greatly appreciated.

 

You might want to check this (and also the other videos) about collisions: http://unity3d.com/learn/tutorials/modules/beginner/physics/on-collision-enter
Also if you check the scripting reference you will find this very handy: http://docs.unity3d.com/ScriptReference/Collider.OnCollisionEnter.html
There you can see, that every collision has information about the velocity that was involved in the impact (relativeVelocity.magnitude)

 

I realized that I could just check the rigidbody's velocity in OnCollisionEnter() as soon as I posted the question, and created a simple working prototype in minutes. Haha. I've probably been using unity way too long to be asking these type of questions, I mainly ask them just to check myself, see if there's a better way of doing what I'm thinking about doing or doing, and to help spread knowledge to anyone who might have a similar question, but sometimes I'm just generally overthinking. Thank you for the help.

 

I think its perfectly valid to ask just to check if there is a better way even if you got a working prototype
Keep one thing in mind though, the velocity you are using may be correct but if you hit a target that is also moving fast, then it might be inapropriate to trigger the explosion because the impact is very small. Then the relativeVelocity ist better. But of course it depends on your game.
Thanks for sharing your solution!