You begin the lesson
by creating a pair of profile curves. You then create several copies
of these curves to form the skeletal contours of the salt shaker’s surface.
To create profile curves for the salt
- Make sure you’ve done the steps in
Preparing for the lessons.
Create > NURBS Primitives > Circle > . In
the options window, select Edit > Reset Settings,
enter the following values, then click the Apply button:
of Sections: 24
The Radius sets
the size of the circle in grid units. A value of 4 creates a circle
with enough size so that you can use the grid for convenient size comparison.
of Sections sets the number of CVs in the circle. By
using 24 CVs, you can create a circle with the subtle contours required
in this lesson. Display the CVs of the circle to see the 24 CVs.
A circle is a curve that
loops back on itself. The CVs work the same way as for any other
curve. The more CVs you create for a curve or surface, the more
detail you can give its shape.
The drawback to using
many CVs is that you’ll have a harder time making smooth shape changes
to broad regions. Also, more CVs means slower processing time as
you work with the curve. It’s best to make curves with as few CVs
as necessary. With experience, you’ll learn how many CVs to use
in a situation.
- Create another circle, this time with
- Radius: 2
- Number of Sections:
This creates a smaller
circle inside the first circle as shown below.
- Change the scene view so you can see
the circles from the top view.
- Right-click the inner circle and select Control
Vertex from the marking menu. Repeat for the outer circle.
on Snap to Points (below the menu
- As shown in the following figure, move
CVs from the outer circle to the corresponding inner circle positions.
As you drag a CV near its destination, the Snap
to Points mode causes the CV to jump to the exact CV
- Turn off Snap to Points.
Turn off the display of CVs for both circles by right-clicking on
the circles and selecting Object Mode from
the marking menu.