public void setBField(float intensity, Vector3f direction) {
		if (intensity > ZERO) {
			if (bField == null)
				bField = new BField();
			bField.setIntensity(intensity);
			if (direction != null)
				bField.setDirection(direction.x, direction.y, direction.z);
		} else {
			bField = null;
		}
	}