float angle = systemRandom.randf(-M_PI_2, M_PI_2);
float velocity = systemRandom.randf(45, 90);
float vx = sin(angle)*velocity;
float angle = systemRandom.randf(-M_PI_2, M_PI_2);
float velocity = systemRandom.randf(45, 90);
float vx = sin(angle)*velocity;