Creo Simulate > Additional Information > Working With Normals > Surface Normals > Surface Normals
  
Surface Normals
Use the Normal > Surface command to display the normal direction for each surface and to change the direction for one or more surfaces. This command appears for 3D models.
Because Creo Simulate sets the normal direction separately for each surface when you create it, the direction of the normals for adjoining surfaces may end up in opposite or inconsistent directions.
See Normal Direction for Surfaces and Shells for information on how Creo Simulate creates and uses normal directions.
When you select Surface, magenta arrows appear displaying the normal direction for each surface in your model. Creo Simulate also displays a utility menu with the following commands:
Fix Normals
Flip Normals
Creo Simulate checks whether you have fixed surface normals at certain points in the modeling process.
Return to Default Material Orientation.