koobas.hobune.stream
Detecting sudden changes in velocity?
I'm working on a racing game where the vehicle is normally colliding with pretty much anything/everything in the level (ground, walls, jumps, etc). So I can't use normal collision detection methods to check if the vehicle has actually "crashed" and not safely glanced off of something.
I think the solution is to check for sudden changes in velocity, but I'm not sure how to do it. I'd like to check if the velocity falls below a specific minimum within a specific amount of time. Any ideas?
I would also like to see a answer to this, as i would like to be able to know how to implement fall damage in a FPS i am working on. i.e I want it so that if i fall off a house, it wont kill me just take away some health,as this is closely related i have commented ins$$anonymous$$d of asking my own question.
For falling damage in a FPS game, see http://www.unifycommunity.com/wiki/index.php?title=FPSWalkerEnhanced I'd say this is a quite different question, since in a FPS game you can stop instantaneously and you don't care; it's only the falling distance you care about.
You could compare the magnitude of the velocity of the previous frame with the magnitude of the velocity of the current frame (or rather, the sqrMagnitude, which is faster):
private var oldVelocity : float; var crashThreshold = 10.0;
function Start () { oldVelocity = rigidbody.velocity.sqrMagnitude; crashThreshold *= crashThreshold; // So it works with sqrMagnitude }
function FixedUpdate () { if (oldVelocity - rigidbody.velocity.sqrMagnitude > crashThreshold) { // Crash } oldVelocity = rigidbody.velocity.sqrMagnitude; }
Thanks, Eric. Works great so far in my initial tests. I had to tweak the crashThreshhold up to 50 for my particular setup.
