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Differential D6654 Diff 21065 manual/modeling/meshes/editing/mesh_options.rst

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manual/modeling/meshes/editing/mesh_options.rst

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.. _bpy.types.Mesh.use_mirror_x: .. _bpy.types.Mesh.use_mirror_x:
X Mirror Mirror
======== ========
The *X Mirror* option of the *Mesh Options* panel allows you to edit symmetrical vertices on the other side The *Mirror* option of the *Mesh Options* panel allows you to transform vertices symmetrically
of the mesh in a single action. When you transform an element (vertex, edge or face), according to the chosen axis. When you transform an element (vertex, edge or face),
if there is its exact X-mirrored counterpart (in local space), if there is its exact axis-mirrored counterpart (in local space),
it will be transformed accordingly, through a symmetry along the local X axis. it will be transformed accordingly, through a symmetry along the chosen axis.
.. note:: .. note::
The conditions for *X Mirror* to work are quite strict, which can make it difficult to use. The conditions for *Mirror* to work are quite strict, which can make it difficult to use.
To have an exact mirrored version of a (half) mesh, To have an exact mirrored version of a (half) mesh,
it's easier and simpler to use the :doc:`Mirror Modifier </modeling/modifiers/generate/mirror>`. it's easier and simpler to use the :doc:`Mirror Modifier </modeling/modifiers/generate/mirror>`.
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.. note:: .. note::
For *Topology Mirror* to work the *X Mirror* option must be enabled. For *Topology Mirror* to work the *Mirror* option must be enabled.
When using the *X Mirror* option to work on mirrored Mesh Geometry, the vertices that When using any of the three *Mirror Axis* options to work on a mirrored Mesh Geometry, the vertices that
are mirrored must be perfectly placed. If they are not exactly positioned in their mirror 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. locations then the *Mirror Axis* will not treat those vertices as mirrored.
*Topology Mirror* tries to address this problem by determining which vertices are mirrored vertices not only by *Topology Mirror* tries to address 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. using their positions but also by looking at how those vertices are related to others in the Mesh Geometry.
It looks at the overall topology to determine if particular vertices will be treated as mirrored. It looks at the overall topology to determine if particular vertices will be treated as mirrored.
The effect of this is that mirrored vertices can be non-symmetrical and yet still be treated as mirrored when The effect of this is that mirrored vertices can be non-symmetrical and yet still be treated as mirrored.
*X Mirror* and *Topology Mirror* are both active.
.. note:: .. note::
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then delete the default cube and add a Monkey object to the 3D View. then delete the default cube and add a Monkey object to the 3D View.
#. Press :kbd:`Tab` to put the Monkey object into *Edit Mode*. #. Press :kbd:`Tab` to put the Monkey object into *Edit Mode*.
#. With the *X Mirror* option disabled move one of the Monkey object's vertices slightly. #. With all the *Mirror Axis* options disabled move one of the Monkey object's vertices slightly.
#. Then Turn *X Mirror* option on again but leave *Topology Mirror* disabled. #. Then Turn the *X Axis Mirror* on but leave *Topology Mirror* disabled.
#. If you now move that vertex again *X Mirror* will not work and the mirrored #. If you now move that vertex again, the *X Axis Mirror* will not work and the mirrored
vertices will not be altered. vertices will not be altered.
#. If you then enable *Topology Mirror* and move the same vertices again, #. If you then enable *Topology Mirror* and move the same vertices again,
then *X Mirror* should still mirror the other vertex, then *X Axis Mirror* should still mirror the other vertex,
even though they are not perfectly positioned. even though they are not perfectly positioned.
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Enables the Auto Merge feature. Enables the Auto Merge feature.
Split Edges & Faces Split Edges & Faces
Detects the intersection of each transformed edge, creating a new vertex in place and sectioning the edge. Detects the intersection of each transformed edge, creating a new vertex in place and sectioning the edge and the face if any.
Threshold Threshold
Defines the maximum distance between vertices that are merged by the *Auto Merge*. Defines the maximum distance between vertices that are merged by the *Auto Merge*.
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