title: What fixture to use for Particles in Box2d?
body: <p>I am making a game using box2D and I need a particle system. I need the particles to eat up as less cpu as possible, while bouncing off other objects. I don't absolutely need the particles to interact with each other or to accumulate on objects. I will be using the particles for graphics and I am planing on simulating a lot of them.</p>
  
  <p>Does anyone know the best kind of fixture to use for each particle? A point with no dimensions and without volume seems to be the best choice, but it seems that it doesn't exist in box2d. What other fixture shape would use the less cpu?</p>
  
  <p>I am using Box2dWeb, a JavaScript port of box2d, but I don't think that matters much, as all Box2d ports are supposed to be similar, right?</p>