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Mirror Editing

X-Mirror

Mode: Edit mode

Panel: Mesh Options » X-mirror

The X-mirror option of the Mesh Options panel allows you edit both “sides” of your mesh in a single action. When you transform an element (vertex, edge or face), if there is its exact X-mirrored counterpart (in local space), it will be transformed accordingly, through a symmetry along the local X axis.

Topology Mirror

The Topology Mirror option is available in the 3D View Editor > Toolshelf Region > Mesh Options Panel whilst in Edit Mode

For Topology Mirror to work the X Mirror option must be enabled.

When using the X Mirror option to work on mirrored Mesh Geometry the vertices that are mirrored must be perfectly placed. If they are not exactly positioned in their mirror locations then X Mirror will not treat those vertices as mirrored. This can be annoying because often the out of position vertices are only very slightly out of position.

Topology Mirror tries to solve this problem by determining which vertices are mirrored vertices not only by using their positions but also by looking at how those vertices are related to others in the Mesh Geometry. It looks at the overall Mesh Geometry topology to determine if particular vertices will be treated as mirrored. The effect of this is that mirrored vertices can be non-symetrical and yet still be treated as mirrored when X Mirror and Topology Mirror are both active.

Note that Topology Mirror functionality will work more reliably on Mesh Geometry which is more detailed. If you use very simple Mesh Geometry such as a Cube or UV Sphere for example the Topology Mirror option will often not work.

For an example of how to use Topology Mirror open up a new Blender scene, then delete Blender's default cube and add a Monkey Object to the 3D Viewport.

Press the TAB Key to put the Monkey Object into Edit Mode.

With the X Mirror option disabled move one of the Monkey Object's vertices slightly.

Then Turn X Mirror option on again but leave Topology Mirror disabled

If you now move that vertice again X Mirror will not work and the mirrored vertices will not be altered.

If you then enable Topology Mirror and move the same vertices again, then X Mirror should still mirror the other vertice, even though they are not perfectly positioned.

Mirror Modifier

The conditions for X-mirror to work are quite strict, which can make it difficult to use. To have an exact mirrored version of a (half) mesh, its easier and simpler to use the Mirror modifier

Snap to Symmetry

Mode: Edit mode

Menu: Mesh  » Snap to Symmetry

The Snap to Symmetry tool works on meshes which are mostly symmetrical but have vertices which have been moved enough that Blender does not detect them as mirrored through the x-mirror function.

This can be caused by accident when editing without x-mirror enabled. Sometimes models imported from other applications are asymmetrical enough that mirror fails too.


Direction
Specify the axis and direction to snap. Can be any of the 3 axes, and either positive to negative, or negative to positive.
Threshold
Specify the search radius to use when finding matching vertices.
Factor
Support for blending mirrored locations from one side to the other (0.5 is an equal mix of both).
Center
Snap vertices in the center axis to zero.
Before Snap to Symmetry
After Snap to Symmetry


Symmetrize Mesh

Mode: Edit mode

Menu: Mesh  » Symmetrize

The Symmetrize tool is a quick way to make a mesh symmetrical. Symmetrize works by cutting the mesh at the pivot point of the object, and mirroring over the geometry in the specified axis, and merges the two halves together (if they are connected)

Direction
Specify the axis and direction of the effect. Can be any of the 3 axes, and either positive to negative, or negative to positive.
Mesh before Symmetrize
Mesh after Symmetrize


Mirroring Geometry

See Mirror for information on mirroring, which allows you to flip geometry across an axis

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