Next: Editing Initial Conditions: Up: Tutorial # 2: Simple Previous: Creating and Editing a
Next: Editing
Initial Conditions: Up: Tutorial
# 2: Simple Previous: Creating
and Editing a
`Tear-off' the Edit 
Materials widget and select Properties to expose the Material
Properties Widget (see Figure 7) which produces
a list of properties with corresponding parameters to specify coefficients
to be entered into the Partial Differential Equations. The Form-button's
function and how to tailor the form to specify groups of coefficients for
a particular model formulation is described in detail in Appendix III.
Figure 7: Material Properties Widget
In the `Add Material' text field, enter `sandy clay'. In the Color text field, enter `tan3' and edit the parameter text fields in this row to specify model parameters. Add a second material `clay' with color `green3'. You may enter additional Materials now and change values for the various model parameters from their default values or dismiss the Properties widget and return at later time.
From the Edit Materials
widget, select Regions to expose the Material Regions Widget (See
Figure 8) which contains an editable list of
3D regions (sub-grids) of material types chosen from the Material Properties
list. Choose option Display - All from the cascade widget.
The material properties are determined by the order in the list, with suceeding
patches overwriting in their region the values determined by those patches
that come before.
Select the Add Region button to expose the Region Specifier Widget (see Figure 9) and select Material - sandy clay from the cascade widget. Choose the `3-D Select-Region' icon of the Main Window (see Section 2.2 and Figure 1) and in the Draw Area select antipodal vertices by clicking on one vertex and dragging to the other. This determines a 3-D region outlined in 'Red' in the main Draw Area. Choose Import Selection from 3-D Window to import indices into the text fields. Select lock to `lock' these text fields to the outlined region in the Main Draw area. The region may then be adjusted and simultaneously viewed in the Main Drawing area by adjusting the values in the index widget. Select OK after adjusting the bounding box to Min(1,1,1) and Max(17,15,2). (Be sure to select `unlock' before dismissing this widget.) Add a layer region of clay with a bounding box from (1,1,2) to (17,15,8) and a `sandy clay' layer from (1,1,8) to (17,15,9).
Add `green clay' material type to the list of Material Properties (see Figure 7) with color `brown3'. Add a `green clay' region from (4,10,2) to (13,15,8). Change the opacity slider bar to 40% to view the layered model as in Figure 10.
Robert Sharpley
Tue Dec 9 10:30:18 EST 1997
