379 			T const invr = static_cast<T>(0.5) / r;  local
381 			real.x = (x[2].y - x[1].z) * invr;
382 			real.y = (x[0].z - x[2].x) * invr;
383 			real.z = (x[1].x - x[0].y) * invr;
388 			T const invr = static_cast<T>(0.5) / r;  local
390 			real.y = (x[1].x + x[0].y) * invr;
391 			real.z = (x[0].z + x[2].x) * invr;
392 			real.w = (x[2].y - x[1].z) * invr;
397 			T const invr = static_cast<T>(0.5) / r;  local
398 			real.x = (x[1].x + x[0].y) * invr;
400 			real.z = (x[2].y + x[1].z) * invr;
401 			real.w = (x[0].z - x[2].x) * invr;
406 			T const invr = static_cast<T>(0.5) / r;  local
407 			real.x = (x[0].z + x[2].x) * invr;
408 			real.y = (x[2].y + x[1].z) * invr;
410 			real.w = (x[1].x - x[0].y) * invr;