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Saturday 9 July 2011

NURBS Lesson 1: Introduction

Subdividing polygon faces
A real hammer handle is narrower near the head than at the base. In the next steps, you'll adjust the
width of the handle. First, you need to subdivide the faces of the handle to add extra vertices.

Currently the handle has only four vertices, one at each corner. With vertices only at the corners, you
can taper the ends of the handle but not other regions. By creating extra vertices throughout the handle,
you can tune the shape wherever you choose
.
To subdivide the handle
1. Shift-select the faces of the handle, including the bottom face.
Dolly and tumble the view to see all the faces to select them.

2. Select Edit Polygons > Subdivide > . In the options window, enter 2 for Subdivision Levels, then
click the Subdivide button.

This divides the selected faces into multiple faces with corresponding extra vertices. You can then
make fine alterations to the handle's shape.
You could have subdivided the handle faces using the Split Polygons Tool described earlier in the
lesson. Subdivide is easier to use because you merely select the face you wish to subdivide. You
don't need to select exact positions on the faces. The disadvantage is that you might end up with
more faces and vertices than you want to work with.

The advantage of the Split Polygons Tool is that you create only the number of faces and
vertices you want, which makes the surface simpler to edit and faster for Maya to process.

3. To see the vertices, right-click the hammer and select Vertex from the marking menu. Display the
hammer in wireframe mode by clicking the 4 hotkey.

4. Scale each row of vertices on the handle inward as desired. A row refers to the vertices that are
at the same height along the edges of the handle. If a few vertices lie at an odd location, that is,
they lie a little above or below a row, move them into a position even with the row.
Besides scaling a row of vertices, you can also move a row of vertices up or down the handle to
alter the contours.


In the next part of the lesson, you'll smooth the edges of the hammer so it looks more authentic.
Before doing this, you might want to tune the hammer's shape by modifying your prior extrusions
or by moving or scaling vertices.

5. To modify an extrusion, first select the face or faces, and then select Modify > Transformation
Tools > Show Manipulator Tool. Next, click each polyExtrudeFace# in the Channel Box until the
extrude manipulator appears on the desired extrusion.

You can move and scale a face with the standard Move Tool rather than the Show Manipulator
Tool. However, the Show Manipulator Tool moves the face in the direction of the surface normal
rather than in a direction along the View Axis. This surface normal direction is usually the desired
direction.

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