Symmetric
Id prefix: SYMM · Elements: exactly three · Selection filter: FACE / EDGE / VERTEX · Entry 10 of 16 in the panel's + dropdown
Symmetric holds two elements as mirror images of each other about a planar face: a pair of brackets either side of a frame's centre plane, two wheels either side of a chassis. Pick the two elements first, one on each of two components, then the mirror face. The mirror is usually on a third component, often the grounded base, but it may belong to either of the first two. Pick order matters: the third pick is always the mirror.
The two elements must be alike:
| Elements | Held as | Freedoms removed |
|---|---|---|
| two planar faces | the second face lies on the first one's mirror image and faces the mirrored way | 3 |
| two lines (cylindrical or conical faces, straight edges) | the second axis lies on the first one's mirror image, either way round | 4 |
| two points (vertices, circular edges, spheres, whole components) | the second point is the first one's mirror image | 3 |
The mirror is read on its own component, so when that component moves, the symmetry moves with it. A mixed pair (a face and an axis), a mirror that is not a planar face, or two elements on one component is refused with a message on the row.
Parameters
| Parameter | ||
|---|---|---|
elements | three elements (face / edge / vertex) | The two symmetric elements, then the planar mirror face. |
Offered for three faces or edges, at least one of them a face, across two or three components — see where constraints are offered.