8

1150 Chapter 9: Sur face Modeling
Left: Falloff=20 (the defau lt)
Right: Falloff=40
Pinch—Raises and lowers the top point of the
curve along the vertical axis. Sets the relative
"pointedness" of the region. When negative, a
crater is produced instead of a point. At a setting
of 0, Pinch produces a smooth transition across
this axis. Default=0.
Left: Pinch=.5
Right: Pinch=2
Falloff and Bubble have their default values.
B ubble—Expands and contracts the curve along
the vert ica l axis. Sets the relative "fullness" of
the region. Limited by Pinch, which sets a fixed
starting point for Bubble. A setting of 0 for Pinch
and 1.0 for Bubble produces a maximum smooth
bulge.NegativevaluesforBubblemovethebottom
of the curve b elow the surface, creating a "valley"
around the base of the region. Default=0.
Left: Bubble=1
Right: Bubble=6
Fallo ff and Pinch have their default values.
Ma ter ial Proper ti es R ollout
Modify panel > Select NURBS object. > Stack display >
Surface sub-object level > M aterial Properties rollout
This rollout controls material mapping onto a
NURBS surface sub-object.
Procedures
To a pply a mapped ma ter ial to a surface sub-obj ect:
1.
On the Material Properties rollout, turn on
Gen. Mapping Coordinates.
2. Use the Material Editor (p age 2–1253) to
assign a mapped material to the surface.
To use multiple map channels on a single surface
sub-object (ex ample):
1.
On the Material Properties rollout, turn on
Gen. Mapping Coordinates.
2. Change the Map Channel value to 2, and turn
on Gen. Mapping C o ordinates.
3. Change the U and V ti ling values for map
channel 2.
Now when you assig n a mapped m aterial, maps
on map channel 1 use the default U V tiling,
while maps on map channel 2 use the channel
2 til ing. An easy way to see this is to create a
checker (page 2–1447) map on channel 1, and