9
826 Chapter 8: Modifiers
War ning: Sl ice and S ub-Object
Selections
You can use Slice on sub-object selection sets
by slicing or removing only the selected faces.
However, because selected faces are sliced and
unselected adjacent faces are not, there may be
"holes"inthemeshontheedgewheretheslice
occurs. These holes can be problematic, creating
discontinuities in smoothing and rendering. Holes
are cr eated only when Operate On Faces is on.
Procedure
Example: To animate the appearance of a teapot
using the Slice modifier:
1.
Create a teapot (page 1–183) primitive. Set the
viewport to wireframe.
2. Apply a Slice modifier.
TheSlicePlanegizmoappearsatthebaseofthe
teapot.
3. On the stack display, choose the Slice Plane
gizmo.
4. Turn on the Auto K ey button, and move the
time slider to f r ame 100.
5. MovetheSlicePlanegizmoabovethetopofthe
teapot. Play t he animation to verify t hat t he
slice plane is animated.
6. Change the Slice type from Refine Mesh (the
default) to Remove Top. Pla y the animation
again.
7. Makeacopyoftheteapotinthesameposition
(chooseEditmenu>CloneandclickOKto
accept the default settings).
8. PutaWireframematerialonthecloneand
change the Slice type on the clone to Remove
Bottom.
9. Play the animation.
The wireframe teapot magically b ecomes a fully
shaded one.
Example: To slice ver tica lly through an object:
1.
Create a teapot (page 1–183) primitive.
2. Apply a Slice modifier.
TheSlicePlanegizmoappearsatthebaseofthe
teapot.
3. On the stack display, open the Slice modifier
and choose t he Slice Plane gizmo.
4. MovetheSlicePlanegizmosoitintersectsthe
middle of the teapot.
5. Rotate the Slice Plane gizmo so it is vertical.
6. Tu r n on Re move Top.
The back of the teapot is sliced away.
7. Tu r n o n Remove B ottom.
The front half of the teapot is sliced away.
Interfa ce
Modifier Stack
Slice Plane—At this sub-object level, you c an
transform and animate the gizmo like any other
object to determ ine w here the slice occurs. Scaling
the gizmo has no effect, b ecause its extents are
effectively infinite. If you need to limit the extent
of the slice, use it on a sub-object selection set of
faces, rather than on the entire object.