The Mirror Symmetry feature () can be added from the model tree under Component using the Topology Optimization context menu. The feature works on domains and boundaries such that any Density Model will have the selection of its filtered, projected, and penalized variables extended (or overwritten) by the Mirror Symmetry selection. The feature can thus be used to reduce design freedom relative to have a larger selection for the Density Model feature.

The Mirror Symmetry feature will only work in conjunction with Density Model features that have the same selection dimension.

Choose a whether the Point on plane of reflection should be Automatic or User defined. The Automatic option will use a point on a flat plane that is adjacent to the feature as well as a Density Model. Similarly, the Normal vector to plane of reflection can either be Automatic or User defined. The Automatic option will use the normal vector of a flat plane that is adjacent to both the feature and a Density Model. When both the Mirror Symmetry feature and the Density Model have a 3D boundary selection, the Automatic option will look for planer edges adjacent to both features and use the cross product between the vector between the end points of the edge and the normal vector of the Mirror Symmetry selection. If the latter is not planar, a User defined value must be provided.