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# Assign Symmetry

The Assign Symmetry command sets symmetry attributes for a selected body. After you select a symmetry plane, Fusion detects symmetry attributes automatically.

You can select edges to manually assign symmetry. When you select edges, the first selection remains stationary, and the second selected edge adjusts to be symmetrical.

When you edit an edge of the body with symmetry on, the symmetrical counterpart edits automatically.

Symmetry Plane

Define the symmetry plane used to detect or set symmetrical partner edges.

The plane can be a coordinate or work plane, a flat face on the body, or you can define it to be a plane that passes through the center of a selected edge and perpendicular to it.

Symmetry Levels

You can edit any form with two levels of symmetry:

• Form-level symmetry
• Edge-level symmetry

Form-level Symmetry

All edges of the form automatically recognize their symmetrical counterparts. Detected symmetry conditions are indicated with color. When you freeform edit any of the edges, the symmetrical counterpart updates automatically.

Form-level symmetry is useful when you start with a basic geometric form and edit edges to sculpt the form to a complex freeform.

NoteIf any edge fails to recognize its symmetrical counterpart, you can resolve the issue by switching to Edge Symmetry and pairing suitable edges for a symmetrical relationship.

Edge-level Symmetry

No edges of the form are analyzed for symmetry conditions, so no existing symmetry conditions are detected.

Apply symmetry conditions to specific edges by:

• Setting a symmetrical relationship between a pair of edges
• Setting a self-symmetric condition for an individual edge across the symmetry condition.

You can set the Edge Symmetry condition on a few edges of a form, and not set Form Symmetry. This gives you the ability to release a symmetry condition between a pair of edges.

Edge-level symmetry has two main advantages:

• Symmetry Correction

An imported base body feature could have an incorrect or different symmetry condition than the one required for freeform editing. You can set the symmetry condition with exact control and flexibility.

• Local Symmetry

When you freeform edit a form, you many need partial or local symmetry.

Symmetry Conditions

Symmetry conditions are either detected (with Form Symmetry), or you set them (with Edge Symmetry).

Self-symmetric Edge

A self symmetric edge is an edge that passes through the defined symmetry plane.

Edges that have this relationship display with the light blue color.

Twin-symmetric Edge

Symmetric twin edges are edges that are "mirrored" through the defined symmetry plane.

Edges that have this relationship display with the dark blue color.

Edge on Plane

An edge on plane is an edge that lies on the symmetry plane.

Edges that have this relationship display with the light green/blue color.

No Identified Symmetry Condition

Edges that have no identified symmetry conditions display with the magenta color.