9.5.2

232 • CHAPTER 7
OBJECTS MENU • NURBS • 233
Flip Normals
Flips (i.e. reverses the direction of) the normals of the Loft NURBS. Usually, CINEMA 4D will point the
normals in the correct direction. However, with open contours it is not possible for CINEMA 4D to
know which way they should point. In this case, you can control the direction of the normals, either
by changing the direction of the spline or by enabling the Flip Normals option. This option does not
effect the caps, since their normals are always calculated correctly.
Caps and Rounding
Use these settings to add caps and/or rounding to the Loft NURBS. The Caps and Rounding settings are
described later in this chapter.
Sweep NURBS
The Sweep NURBS requires two or three splines. The rst spline, the contour spline, denes the cross
section and is swept along the second spline, the path, to create the object. The optional third spline
(rail spline) can be used to modify the scale of the contour spline over the object’s length.
The contour spline should lie on the local XY plane.
You can use splines with multiple segments, e.g. you can sweep an entire word along the path.
This logo was swept parallel along two path splines (the nal scale is 30%).
The contour spline is swept along the path in the direction of the contour’s Z-axis. If you are using a
planar (two-dimensional) path spline, there are no further considerations. However, the behavior of
the sweep is a little more complicated with a non-planar (three-dimensional) path.
If you enable Banking, the following rules apply: The contour spline is rotated at the start of the path
spline so that its X-axis is parallel to the average plane of the path spline. The contour is still placed
with its Z-axis tangential to the path spline. All subsequent contours are placed in such a way that
the angle change from start to nish is kept to a minimum. If necessary, the contour is also given a
rotation so that the start and end contours meet with closed path splines.