I'm using cocos2d to program a game and am using box2d for collision detection. Everything in my game is a circle and right not for some reason I'm having a problem with some times things are not being detected as a collision when thy should be.

I'm thinking of rolling up my own collision detection since I don't think it would be too hard.

Questions are:

1. Would this approach work for collision detection between circles?
   a. get radius of circle A and circle B.
   b. get distance of the center of circle A and circle B c. if the distance is greater than or equal to the sum of circle A radius and circle B radius then we have a hit
2. Should box2d be used for such simple collision detection? There are no physics in this game.

I'm using cocos2d to program a game and am using box2d for collision detection. Everything in my game is a circle and for some reason I'm having a problem with some times things are not being detected as a collision when they should be.

I'm thinking of rolling up my own collision detection since I don't think it would be too hard.

Questions are:

1. Would this approach work for collision detection between circles?
   a. get radius of circle A and circle B.
   b. get distance of the center of circle A and circle B c. if the distance is greater than or equal to the sum of circle A radius and circle B radius then we have a hit
2. Should box2d be used for such simple collision detection? There are no physics in this game.