Part Modeling > Base Features > Sweeps > Sketch Plane Orientation > Constant Normal (Automatic)
Constant Normal (Automatic)
The z-axis is along the direction defined by the constant normal reference. Creo calculates x and y along the trajectory. For some trajectories, for example, some straight lines (or non-sketched lines), there is no intrinsic default orientation. Therefore, you must select an x-direction at the start. The system cannot automatically set the x-axis.
1. Constant normal reference
2. Origin trajectory