3dgs.py的错误：mid = 0.5 * (cov[0] + cov[2])

[GTukin]

        # compute radius, by finding eigenvalues of 2d covariance
        # transfrom point from NDC to Pixel
        mid = 0.5 * (cov[0] + cov[1])  

        # 这里应该是mid = 0.5 * (cov[0] + cov[2]) 对应原3dgs的float mid=0.5f*(cov.x+cov.z);

        lambda1 = mid + sqrt(max(0.1, mid * mid - det))
        lambda2 = mid - sqrt(max(0.1, mid * mid - det))