I'm developing a game which basically involves a lot of collisions and explosions. Now, whenever I have a collision between two bodies, I want to draw a particle effect like an explosion at the collision position, but I'm not sure how do I do that. Normally I know how to draw particles but because I'm using box2d and I'm not using pixels but meters(every pixel is 32 meters), I'm not sure what size should the particle effect be.
If you guys could help me out here I would really appreaciate that.