Step 4. Assign Material Properties

a. Click the  button to bring up the dialog box.
b. Select a material by clicking the color square next to it.
c. Click the  button.
d. Click points to draw a polygon that outlines the extent of this material.
e. Hold down the "Ctrl" key when you click the last point of the polygon.

When you have finished, the mesh elements enclosed by the polygon are painted with the color corresponding to the material you selected.

The above procedure may be repeated for assigning additional materials.