9

Trim/Extend Modifier 867
To trim, you need intersecting splines. Click
the portion of the spline you want to remov e.
Thesplineissearchedalongitslengthuntilit
hits an intersecting spline, and deleted up to
theintersection.Ifthesectionintersectsatboth
ends, the entire section is deleted up to the two
int ersections. If the section is open on one end and
intersects at the other, the entire section is deleted
uptotheintersectionandtheopenend. Ifthe
section is not intersected, nothing happens.
To extend, you need an open spline. The end of
thesplinenearestthepickedpointisextended
until it reaches an intersecting spline. If there is
no intersecting spline, nothing happens. Curved
splines extend in a direction tangent to the end of
the spline. If the end of a spline lies directly on a
boundary (an intersecting spline), t hen it looks for
an intersection further along.
Note: As of version 3 of 3ds Max, Edit/Editable
Spline (page 1–289) includes interactive
trim/extend functions. The only reason to use this
modifier is to apply it at a specific location on the
stack.
Before and after initial use of Trim
Before and after second use of Trim on above spline
Before and after using Extend
Procedure
To tr im a shape using the Trim/Ex tend modifier:
1.
Create an open Line shape (page 1–270) in the
form of roughly concentric overlapping circles.
2. Apply the Trim /Extend mo difier.
3. Click Pick Locations.
4. Cl ick the inner spline sections of the concent ric
shape to trim them away, or click the open
spline segment to extend the spline.
Interfa ce
Pick Locations—Click to turn on Pick mo de.
While in this mode, the m ouse cursor changes in
appearance when over par t of the spline that can
be affected by the Trim/Extend modifier. Click
to either trim or extend the spline, based on the
settings below. Default=Auto.