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1672 Chapter 16: Material Editor, Materials, and Maps
• Object—Uses an object whose position
determines the falloff direction. Click the wide
button next to Object in the Mode Specific
Parameters group, and then pick an object in
the scene. The falloff direction is the direction
from the point being shaded toward the object ’s
center. Points on the side toward the object
center get the Towards value, and those away
from the object get the Away value.
•
Local X/Y/Z Axis—Sets the falloff direction to
one of the object’s local axes. Changing the
orientation of the object changes the falloff
direction.
•
World X/Y/Z Axis—Sets the falloff direct ion
to one of the world coordinate system axes.
Changing object orientation doesn’t affect the
falloff m ap.
When no object is chosen, the fa lloff direction uses
the local X , Y, or Z axis of the object being shaded.
Mode Specific Parameters group
The first parameter applies and is available only
when you set Falloff Direction to Object:
Object—Picks object from scene and puts its name
on the button.
The following are parameters for the Fresnel falloff
type:
Override Material IOR—Allows change to the Index
of Refraction set by the material.
Index of Refraction—Sets a new Index of Refraction.
This option is unavailable unless Override Material
IOR is tur ned on.
The follow ing are p ar ameters for the Distance
Blend fa l loff type:
Near Distance—Sets the distance at which the blend
effect begins.
Far Distance—Sets the distance at which the blend
effect ends.
Ex trapolate—When on, the effect continues
beyond the Near and Far distances.
Mix Curve rollout
Using the graph on the Mix Curve rollout, you
can precisely control the gradient produced by any
falloff type. You see the resulting gradient in the
bar below the gr aph.
Move flyout
Moves a selected point in any direction,
limited by the unselected points on either side.
Constrains movement to t he horizontal.
Constr ains movement to the vertical.
Scale Point—Scales the selected point within
the range of its g radient. On a Bezier corner point,
thiscontroliseffectivelythesameasavertical
move. On a Bezier smo oth point, you can scale
the poin t itself or either handle. As with the move
cont rols, scale is limited by the unselected points
on either side.
Add Point flyout
Adds a Bezier corner point anywhere on the
graph line. The point makes a sharp angle when
moved.