9

1192 Chapter 9: Surface Modeling
Max—
Locatesthelatheaxisatthecurve’spositive
local X-axis boundary.
Min, Center, a nd Max lathes of the same curve
Start Point—Adjusts the position of the curve’s
start point. This can help eliminate unwanted
tw ists or "buckles" in the surface.
Thiscontrolisdisabledifthecurveisnotaclosed
cur ve.
Thestartpointisdisplayedasabluecircle.
Flip Normals—Lets you flip the surface normals
at creation time. (After creation, you can flip
normals using controls on the Surface Common
rollout.)
Cap—When on, two surfaces are generated to close
the ends of the lathe. While they are present, the
cap surfaces are maintained so they match the
dimensions of the lathe surface. The lathe must be
a 360-degree lathe.
The Cap check box appears only on the creation
rollout. If you want to remove the caps later,
simply select them as sur face sub-objects and
delete them. Think of lathe capping as a workflow
shortcut rather than a property (or parameter) of
lathe surfaces.
Toflipthenormalofalathecap,selectitasa
Surface sub-object and use the Flip Normals toggle
on the Surface Common rollout.
Addingacaptoapartiallathe
Lathe Surface rollout (modification tim e )
Degrees —Sets the angle of rotation. At 360 deg rees
(the default), the surface completely surrounds
the axis. At lower values, the surface is a partial
rotation.
Direction group
XYandZ—Choose the axis of rotation. Default=Y.
Align group
Thesebuttonspositiontheaxisofrotationrelative
to the curve.
Min—(The default.) Loc ates the lathe axis at the
curve’s negative local X-axis b oundary.