9.5.2

226 • CHAPTER 7
OBJECTS MENU • NURBS • 227
Flip Normals
Flips (i.e. reverses the direction of) the normals of the Extrude 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.
Hierarchical
If this option is enabled, you can group, say, several splines within a Null object and place this group
in an Extrude NURBS. Each spline of this group is now extruded separately. This is important especially
for a text spline when you have enabled its Separate Letters option. In this case, a separate spline is
created for each letter; these splines are in an object group. The Hierarchical option must be enabled
to extrude these separate letters.
Untriangulate
This option removes polygon edges where possible by converting triangles to quadrangles. However,
this only works if the spline does not intersect itself when projected onto its average plane. If the
spline intersects itself — such as a gure of eight — a different algorithm will be used (the one from
CINEMA 4D R8.5 and earlier) that does not take the option into account.
Caps and Rounding
Use these settings to add caps and/or rounding to the Extrude NURBS. The Caps and Rounding settings are
described later in this chapter.
Lathe NURBS
The Lathe NURBS rotates a spline about the Y-axis of the local axis system of the NURBS object to
generate a surface of revolution, e.g. you can create a wineglass from a simple prole. The lathed
object appears as soon as you drop the spline into the Lathe NURBS in the Object manager. Usually
the prole should lie on the XY plane (because it will be rotated about the Y-axis).