About rescale function

[xuyaojian123]

def rescale(self, scale: float):
        if scale != 1.:
            self.xyz *= scale
            self.scales += np.log(scale)
            print("rescaled with factor {}".format(scale))

First of all great work! If we scale the Gaussian by two times, why does its center xyz change? Why is self.scales += np.log(scale) instead of self.scales *= scale? Could you explain it?