118     float det_1;  in Inverse()  local
153     det_1 = pos + neg;  in Inverse()
155     if( det_1 == 0.0 )  in Inverse()
161         det_1 = 1.0f / det_1;  in Inverse()
162         ret.f_[0] = (f_[5] * f_[10] - f_[9] * f_[6]) * det_1;  in Inverse()
163         ret.f_[1] = -(f_[1] * f_[10] - f_[9] * f_[2]) * det_1;  in Inverse()
164         ret.f_[2] = (f_[1] * f_[6] - f_[5] * f_[2]) * det_1;  in Inverse()
165         ret.f_[4] = -(f_[4] * f_[10] - f_[8] * f_[6]) * det_1;  in Inverse()
166         ret.f_[5] = (f_[0] * f_[10] - f_[8] * f_[2]) * det_1;  in Inverse()
167         ret.f_[6] = -(f_[0] * f_[6] - f_[4] * f_[2]) * det_1;  in Inverse()
168         ret.f_[8] = (f_[4] * f_[9] - f_[8] * f_[5]) * det_1;  in Inverse()
169         ret.f_[9] = -(f_[0] * f_[9] - f_[8] * f_[1]) * det_1;  in Inverse()
170         ret.f_[10] = (f_[0] * f_[5] - f_[4] * f_[1]) * det_1;  in Inverse()