2 croman : Well, If you look at any particle of a moving object , you'll see that they remain in their spots after they are created, instead of moving along with the object. And it's very noticable if you stand and then go, since particles are of the proper size if you stand, but seem bigger if you move, because they get closer to the camera (they remain on their initial spots). And "playing" with velocity (p->vel_x,p->vel_y, etc) does not seem to help much.