c# - How can I avoid detection of second collision of same objects in Unity3d? -

i making game in style of old "lotus" games (player's car moves on bottom of screen left , right only, opponents car appear on top , "chased" move down towards player's car). have rigidbodies on cars , when player's car collides other 1 want detect but once.

i use:

void oncollisionenter (collision collision) {     contactpoint contactpoint = collision.contacts [0];      gameobject cube = gameobject.createprimitive (primitivetype.cube);     cube.transform.position = contactpoint.point;  } 

with code cube created 1-5 times , means collision occures several times on same object. achieve after first collision 1 not reported (no cube collision should created) still 1 cube should created when collision opponent car occurs. in short: 1 cube each collision opponent cars. intend use kind of score calculations.

any ideas?

i think should create bool variable. private bool detectedcollision = false; , when detect collision @ first turn variable true , when you'll need detect collision turn false. think easy way it.

void oncollisionenter (collision collision) { if(!detectedcollision){     contactpoint contactpoint = collision.contacts [0];      gameobject cube = gameobject.createprimitive (primitivetype.cube);     cube.transform.position = contactpoint.point; detectedcollision = true; }  }