9

970 Chapter 9: Surface Modelin g
To delete patches:
1.
Make a selection at the Patch sub-object level.
2. Click Delete.
The patches disappear.
To subdivide a patch:
1.
Make a selection at the Patch sub-object level.
2. Turn on Propagate to maintain surface
continuity.
3. Click Subdiv ide.
The patch select ion is subdivided, increasing
the number of p atches.
You can repeat this process, subdividing
multiple times. Each subdivision increases the
number of patches, which become increasingly
smaller. The following figure is an example of
modeling a hi ghly subdivided surface.
To subdivide a n edge:
1.
AttheEdgesub-objectlevel,makeanedge
selection.
Asingleedgeisindicatedbyitscoordinateaxis
or transform gizmo at the center of the edge.
For multiple edges, the axis icon is at the center
of the selection set.
2. Optionally,turnonPropagatetomaintain
surface continuity.
3. Click Subdiv ide.
The edge selection is subdivided. Each new
edge is on the boundary of a new , smaller patch.
To add a patch:
1.
AttheEdgesub-objectlevel,selectanopen
edge (one that bounds a single patch, and
therefore is not shared with another patch).
2. ClickAddTriorAddQuad.
A new patch is added to the surface.
To unlo ck inter ior edges of selected patches:
1.
At the Patch sub-object level, select one or more
patches.
2. Right-click the selection and choose Manual
Interior from the pop-up menu.
The check mark moves from Auto Interior, the
default, to Manual Interior. Interior edges and
their vertices are now unlocked. If you now
tra nsform the patch, the interior edges remain
static. To tr ansform the interior vertices, see the
following procedure.
To t ra ns for m inter i or ver t ices:
1.
At the Patch sub-object level, select one or more
patches.
2. Right-click the selection and choose Manual
Interior from the pop-up menu.
The check mark moves from Auto Interior, the
default, to Manual Interior.
3. Switch to Handle lev el.
The interior vertices appear as yellow squares.
4. Transform the interior vertices of the selected
patches.
To anchor a pa tch:
By default, the welding process shifts the geometry
of both patches to a common center. You can
anchor one patch so that the other patch moves to
its location when the weld occurs.
1. At the Patch (Patch) level, before you begin the
weld, select the patch you want anchored.
2. Return to Vertex level and weld the vertices.