Introduction
In this tutorial, you
will learn how to use Lattice Rig to widen the opening of a vase
two different ways, by setting up the lattice differently while
it is disengaged.
Watch
a movie.
Part 1: Widen the opening
using a shear-type modification.
Generate the lattice
- Open tutorialVase.wire.
This file is located in the CourseWare/wire directory
on the documentation CD that came with Alias.
- Choose Object Edit > Dynamic Shape Modeling > Lattice Rig to open the Lattice Rig toolbox.
- Select all surfaces of the vase model.
- Click Accept Targets to
create the lattice. Notice the lattice is formed around the vase model.7
Use the lattice to
enlarge the top
- Use the and click the top four points
of the lattice. They now have arrow manipulators attached to them.
- Click the Scale button
to change the lattice manipulation mode to scale. The manipulators
change to boxes. These are scale manipulators.
- Choose Layouts > Top to switch to the top view.
- In the Lattice Rig toolbox, click on
the Toggle Lattice Engage State tool.
The lattice is drawn with solid lines, and the
surfaces have a yellow-green highlight.
- Use the and drag on the pink manipulator
to scale the selected lattice points.
The pink manipulator in an orthographic view
scales proportionally in that view. In this case, the opening of
the vase enlarges, but the vase does not grow taller.
- Release the mouse button. The target
surfaces update to show the vase enlarged as well.
- Choose Layouts > Front . The top of the vase widens,
and the sides of the vase remain linear.
Part 2: Widen the opening
but leave the bottom stationary.
Follow the steps in Generate
the lattice of Part 1 of this tutorial to load in the
vase model and to generate the initial lattice.
Modify the lattice
- Use the and draw a pick box around
the bottom lattice points.
They now have arrow manipulators attached to
them.
- Use the and click-drag any one of
the blue arrow manipulators to move the bottom of the lattice up,
as shown below.
- Release the mouse button.
The bottom points and
edges of the lattice are now drawn in red. This indicates that the
bottom of the lattice is locked, as it intersects the target surfaces
in this rig.
- Double-click or -click the Lattice
Rig icon in the toolbox to open the option window.
- Under NURBS Control,
increase the value of Minimum Degree (u,v) from 3 to 5.
This changes the degree of the output surfaces to 5 in both U and
V directions. Close the option window.
Use the lattice to
enlarge the top
- Use the and click the top four points
of the lattice.
They
now have arrow manipulators attached to them. Also notice that
the bottom four points are no longer selected.
- Click the Scale button
to change the lattice manipulation mode to scale.
The manipulators change
to boxes. These are scale manipulators.
- Choose Layouts > Top to switch to the top view.
- In the Lattice Rig toolbox, click the Toggle
Lattice Engage State tool.
The lattice is now drawn with solid lines, and
the surfaces have a yellow-green highlight.
- Use the to drag the pink manipulator
to scale the selected lattice points.
The pink manipulator in an orthographic view
scales proportionally in that view. In this case, the opening of
the vase enlarges, but the vase does not grow taller.
- Release the mouse button.
The target surfaces update
to show the vase has enlarged as well.
- Choose Layouts > Front .
The top of the vase has widened, but the bottom
of the vase below the bottom of the lattice remains unchanged. The
sides of the vase change gradually. Contrast this shape with that
from Part 1.