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866 Chapter 8: Modifiers
Inter face
Parameters rollout
Oper ate On—Specifies whether to perform the
tessellationonthetriangularfacesoronthe
polygonal facets (the areas bound by visible edges).
Face s—Treats the selection as a set of
triangular faces.
Poly gons—Divides the polygonal facets.
For example, using the polygonal method on the
side of a box results in cross-shaped edges using
the Edge method, and X-shaped edges using the
Face-Center method.
Edge—Divides the face or polygon from its center
tothemiddleofeachedge. Whenappliedtoa
triangular face, it also divides unselected faces that
share edges with the selected faces.
Face-Center—Select this to divide the face from the
center to the vertex corners.
Tension—Determines if the new faces are flat,
concave, or convex after Edge tessellation. A
positive value rounds faces by pushing vert ices
outward. A negative value creates concave faces
by pulling vert ices inward. A setting of 0 keeps
the faces flat. Also works with the Edge/Polygon
method. Default=25.
Iterations group
Iterations—Specifieshowmanytimesthe
tessellation is applied. For example, setting
Iterations to 2 is similar to clicking the Tessellation
button twice in an editable mesh, except that you
can easily back out at any time w hile using the
Tessellate modifier. If you want more than four
iterations, apply another Tessellate modifier.
Update Options g roup
Always—Tessellation is updated whenever the base
geometry changes.
When R ender i ng—Tessellation is updated only
when the object is rendered.
Manually—Tessellation is updated only when the
user clicks Update.
Update—Click to update tessellation. Has no effect
unlessManuallyistheactiveupdateoption.
Tr im/Ex tend Modifier
Select a shape. > Modify panel > Modifier List >
Object-Space M odifiers > Trim/Extend
Select a shape. > Modifiers menu > Patch/Spline Editing
>Trim/Extend
The Trim/Extend modifier is used primar i ly
to clean up overlapping or open splines in a
multi-spline shape so that l ines meet at a single
point. As with the Fillet/Chamfer modifier, this
modifier operates on the splines at the sub-object
level in the shape. When applied to a selection of
multiple splines, Trim/Extend works as it does on
a single spline.