»Click here to display Table of Contents« OptiStruct > User's Guide > Design Optimization > Manufacturing Constraints > Manufacturability for Topology Optimization > Combining Pattern Repetition and Pattern Grouping with other Manufacturing Constraints for > Manufacturability for Topography Optimization > Pattern Grouping Options for Topography Optimization:
For a single plane of symmetry (TYP = 10), the plane is defined normal to the first vector and is located at the anchor node.
TYP = 10: One plane of symmetry