void calcAtomsMinMax(Point3f pointMin, Point3f pointMax) {
		if (atomCount <= 0)
			return; // XIE
		if (atomCount < 2) {
			pointMin.set(-10, -10, -10);
			pointMax.set(10, 10, 10);
			return;
		}
		pointMin.set(atoms[0]);
		pointMax.set(atoms[0]);
		for (int i = atomCount; --i > 0;) {
			// note that the 0 element was set above
			checkMinMax(atoms[i], pointMin, pointMax);
		}
	}