9

924 Glossary
Con trol Vertex (CV )
Control vertices in the lattice surrounding a NURBS surface
In NURBS modeling, a vertex that controls a CV
Curve or CV Surface. The 3D location of each
CVaffectstheshapeofthecurveorsurface.CVs
aren’t constrained to lie on the curve or surface.
Each CV has a rational weight that can be used to
adjust the influence of the CV on the curve’s or
surface’s shape.
Con troller
Software that controls animation. Controllers
handle the following functions:
•Storinganimationkeyvalues
• Storing procedural anim ation settings
• Interpolating between animation key values
Convex H ul l P ropert y
The property of NURBS curves and surfaces
whereby the control lattice described by CVs forms
a convex hull surrounding the curve or surface.
Cool
It’s useful to be able to edit a material in the
Material Editor and have it immediately updated
in the scene. Sometimes you want to work on a
material without affecting the scene. You want to
adjust a material until you’re sure that it’s what you
want, and then reassign it. In other words, you
want to cool a hot material (page 3–953).
You cool a material by copying it in the Material
Editor sample slots. You can copy a material in
two ways:
•UsetheCopyMaterialbutton.
•Draganddroptocopythematerial.
When you drag to copy a sample, you end up
w ith two materials w ith the same name, but one is
cool while the other is hot. In the Ma terial Editor,
you can hav e up to 24 materials with the same
name, but every m aterial in your scene must have
auniquename.
You can no w adjust the cool material, and compare
it with t he hot material. If you like the changes
you’ve m ade, you can update the scene.
Coor dina te Spa ce
In character studio biped animation, the three
most-used coordinate spaces are world, object,
and body sp ace. T hese are often used to control
the biped’s hands and feet.
Anothercoordinatesystemisusedforthefootstep
gizmos themselves: a foot on a footstep is in that
footstep’s co ordinate space. If the footstep is
move d, the foot moves also. (A sliding footstep
is a footstep that moves relative to the coordinate
system of the corresponding footstep gizmo .)