9

CV Surface 1105
Create Parameters rollou t
Lengt h—The length of the surface in current
3ds Max units.
Width—Thewidthofthesurfaceincurrent
3ds Max units.
On the Modif y p anel, the Leng th and Width
spinners are no longer available. You can change
the length or width of the surface by scaling the
surface at the Surface sub-object level. Moving CV
sub-objectsalsoaltersthelengthandwidthofthe
surface.
Lengt h CVs—The number of CVs along the length
of the surface. In other words, the initi al number
ofCVcolumnsinthesurface.Canrangefrom4
to 50.
Width CV s—The number of CVs along the w idth of
the surface. In other words, the initial number of
CV rows in the surface. Can range from 4 to 50.
On the Modify panel, the CV Length and Width
spinners are no longer available. You can change
thenumberofrowsandcolumnsbydeleting
existing rows and columns, or by adding new
rows and columns using t he Refine controls at the
Surface CV sub-object level.
Genera te M apping Coordinates—Generates
mapping coordinates so you can apply mapped
materials to the surface.
The Generate Mapping Coordinates control is
present on the Modify panel. It is at the Surface
sub-object level.
Flip Normals—Turn on to reverse the direction of
the sur face normals.
The Flip Normals control is present on the Modify
panel. It is at the Surface sub-object level.
When you modify a CV surface, a rollout lets you
change its surface appr oximation settings (page
1–1239).
Automatic Reparam e ter ization group
The radio buttons in this group box let you
choose automatic reparameterization. With
reparameterization, the surface maintains
its parameteri zation as you edit it. Without
reparameterization, the surface’s parameterization
doesn’t change as you edit it, and can become
irregular.
None—Do not reparameterize.
Chord L e n g t h —Cho o ses the chord-length
algorithm for reparameterization.
Chord-length reparameterization spaces knots (in
parameter space (page 3–988)) based on the square
rootofthelengthofeachcurvesegment.
Chord-length reparameterization is usually the
best choice.
Unifor m—Spaces the knots uniformly.
A uniform knot vector has t he advantage that the
surface will change only locally when you edit it.
With the other two forms of p a rameterization,
moving any CV can change the entire surface.