9

1176 Chapter 9: Surface Modeling
Procedure
To create a point curve o n surface :
1.
In a NURBS object that contains at least
onesurface,turnonCreatePointCurveon
Surface in the NURBS toolbox, or Point on Surf
ontheCreateCurvesrollout.
2. Do one of the following:
• Draw the curve in t he viewport, using the
mouseabovethesurface.
• Turn on 2D View. This displays an Edit
Curve on Surface dialog, which lets you
create the curve in a two-dimensional (UV)
representation of the surface.
3. Right-click to end curve creation.
Inter face
Pointcurvesonsurfaceshavepointsub-objects
that you can transform and edit in viewpor ts as
you do with plain point cur ves.
(There is no special Move Surface Points button as
there was prior to 3ds Max 3.)
Point Cur ve on Surface rollout (creation time)
Trim Controls group
Trim—When on, t rims the surface against the
curve. When off, the surface isn’t trimmed.
If it’s impossible to trim with this curve, the surface
is displayed in the er ror color (orange by default).
Forexample,thecurveisunusablefortrimmingif
it doesn’t form a closed loop.
Flip Trim—When on, t rims the surface in the
opposite direction.
2D V iew—When on, displays the Edit Curve on
Surface dialog (page 1–1229),whichletsyou
create the curve in a two-dimensional (UV)
representation of the surface.
Point Cur ve on Surface ro llout (modification
time)
Trim Controls grou p
Tri m—When on, trims the surface against the
curve. When off, the surface isn’t trimmed.
If it’s impossible to trim with this curve, the surface
is displayed in the error color (orange by default).
For example, the curve is unusable for trimming if
it doesn’t form a closed loop.
Flip Trim—When on, t rims the surface in the
opposite direction.
Replace Surface—Lets you replace the parent
surface. Click a button, then click a surface to
replace the original parent surface.
Edit—Click to display the Edit Cur ve on Surface
dialog (page 1–1229), which lets you edit the curve
in a two-dimensional (UV) representation of the
surface.
To edit multiple curves on a surface, select more
thanonepointcurvesub-objectonthesame
surface, then click Edit.