9

1104 Chapter 9: Surface Modeling
objects. The Modify panel provides other ways to
change the values you set in t he Create panel.
Procedure
To cre ate a CV surface:
1.
Go to the Create panel.
2. Turn on Geometry, and choose NURBS
Surfaces from the drop-down list.
3. Turn on CV Surf.
4. In a viewport, drag to specify the area of the
planar segment.
5. Adjust the surface’s creation parameters.
Note: When you edit a CV surface you can add
or move CVs so that more than one CV is at
thesamelocation(orclosetoit)toincrease
the influence of the CVs in that region of t he
surface. Two coincident CVs sharpen the
curvature. Three coincident CVs create an
angular peak in the surface. This technique can
help you shape the surface. However, if you
later mov e the CVs individually, you lose this
effec t. (You can also obtain the influence of
multiple CVs by fu sing (page 3–946) CVs.)
Inter face
Thecreationparametersarethesameforboth
pointsurfacesandCVsurfaces,exceptthatthe
labels indicate which kind of basic NURBS surface
you are creating.
Keyboard Entry rollout
The Keyboard Entr y rollout lets you create a CV
surface by typing. Use the
Tab key to move
betweenthecontrolsonthisrollout.Toclickthe
Create button f rom the keyboard, press
Enter
while the button is active.
X, Y, and Z—Let you enter the coordinates of the
center of the surface.
Length and Width—Let you enter the dimensions
of the surface, in c urrent 3ds Max units.
Lengt h CVs—Lets you enter the number of CVs
along the length of the surface (this is the initial
number of CV columns).
Width CVs—Lets you enter the number of CVs
along t he width of the surface (this is the initial
number of CV rows).
Cr e a te—Creates the surface object.