Once you’ve finalized one half of your polygon
model (and deleted its construction history) you’ll want to create
the opposite half by copying it across the axis of symmetry so you
have the complete model. You can produce a mirrored copy of a polygon
mesh using Mirror Geometry (
Mesh > Mirror Geometry).
Before copying one half
across the axis of symmetry, you should check that all of the border
edges lie along the axis of symmetry. If any edges do not lie along
this axis, the original half will be copied based on the vertices
that create the widest point and a gap between the two halves may
To ensure that the border vertices lie
along the axis of symmetry
- Enlarge the front view so you can view
the vertices that lie along the axis of symmetry.
If any vertices on the
mesh protrude across the Y axis, you’ll need to snap these to the
Y axis using the Move Tool in combination with
the Snap to grids feature.
NoteAny vertices that
protrude across the Y axis likely occurred as a result of an earlier
extrude operation. Because the extrude feature extrudes components
based on the face normal, a few vertices may have moved across the axis
- In the front view, select all of the
vertices that should lie along the axis of symmetry (Y axis) using
a bounding box selection.
- On the Status Line,
turn on Snap to Grids.
- In the Toolbox,
double-click the Move Tool to display its tool
settings and ensure that the Retain component spacing setting
is turned off.
- In the front view, click-drag the red
arrow on the Move Tool manipulator to the
right a small distance.
The vertices immediately
snap to the grid line to the right. They initially will not be positioned
at the location you want, but you’ll notice that all of the vertices
you selected are now aligned to each other.
- Drag the manipulator towards the left
until the vertices snap to the Y axis.
- On the Status Line,
turn off Snap to Grids.
- Click off the mesh to unselect the vertices.
To mirror copy the polygon mesh
the mesh, change the selection mode to Object, and
then select the helmet mesh.
Mesh > Mirror Geometry > , set
the following options, and then click the Mirror button.
- Mirror Direction:
- Merge with original:
- Merge vertices:
The mesh is copied along
-X to create the opposite half of the model. The two meshes are
combined into one and vertices are merged so they become shared.
- Save your work before proceeding to the
At this point, the low
resolution version of the helmet model is complete. In the next
section you’ll preview how the model appears at a higher resolution using
the subdiv proxy feature.