docs: @Pure
  	public static boolean intersectsSphereSphere(
  			double x1, double y1, double z1, double radius1,
  			double x2, double y2, double z2, double radius2) {
  		double r = radius1+radius2;
  		return FunctionalPoint3D.distanceSquaredPointPoint(x1, y1, z1, x2, y2, z2) < (r*r);
  	}