9

976 Chapter 9: Surface Modelin g
2.
Choose from commands on the quad menu.
The Tools 1 (upper-left) quadrant includes two
options specific to patch vertices:
• Coplanar: If you set a patch control point’s
property to be coplanar, it’s like locking the
handle of the outgoing vector for that point.
Moving a handle attached to a coplanar
vertexcausestheoppositevectorstoadjust
their positions to maintain a coplanar
surface. This option is the default a nd gives
smooth transitions between patches.
• Cor n er : If you set a patch control point’s
property to be corner, it unlocks the handle
of the outgoing vector, so you can create a
discontinuous break in the patch surface.
To switch vertex ty pes f rom Coplanar to Corner, do
one of the fol lowing:
1.
Hold down Shif t as you move a handle of a
Coplanar vertex.
This switches the vertex type to Corner.
IfLockHandlesisoff(thedefault),
Shi f t +Move "breaks" the handle, allowing it
to move independen tly.
IfLockHandlesison,thehandlesremain
locked in their coplanar relationship. However,
the vertex is still switched to Corner, and
turningoffLockHandlesletsyoumovethe
handles separately.
2. Right-click the vertex, and choose Corner from
the quad menu.
To delete a vertex :
1.
At Patch (Vertex) level, select a vertex.
2. Click Delete.
The vertex and all patches sharing this control
point are deleted.
Deleting vertices
To weld ver tices:
1.
At Patch (Vertex) le vel, select two valid vertices
on different patches.
2. Set Weld Threshold to a value at least equal to
the distance between the selected vertices.
3. Click Selected.
The two vertices move together and join.