public void step(double deltaT) {
        for (Collider collider : colliders) {
            //TODO: check Vector3d operations and make physics for sphere jump.
            if (!collider.isStatic()) {
                Vector3d location = collider.getCenter();
                Vector3d velocity = collider.getVelocity();

                location = location.add(velocity.multiply(deltaT).add(gravity.multiply(deltaT * deltaT / 2)));
                velocity = velocity.add(gravity.multiply(deltaT));

                collider.setVelocity(velocity);
                collider.setCenter(location);
            }
        }
    }