Page 130 - Divyank Tyagi

96 | ChapTER 3 The Basics of The ToolBox

2. Go to the Massing & Site tab in the ribbon and click the Subregion tool.
3. Switch to Pick Lines mode in the Draw panel of the contextual ribbon.
4. Hover your mouse pointer over one of the dashed detail lines on the left side of the sur-
face, Tab-select the chain of lines, and then click to select them. You will see a purple
sketch line appear.
5. Repeat step 4 for the dashed detail lines at the right side of the surface.
6. Switch to Line mode in the Draw panel of the contextual ribbon, and draw a line connect-
ing each open end of the water edge lines, as shown in Figure 3.31.

Figure 3.31
The sketch boundary
for a subregion must be
a closed loop but can
overlap the edge of the
toposurface.

7. Click Finish Surface in the contextual ribbon to complete the subregion.
8. Activate the Default 3D view and select the subregion you created in the previous steps.

9. In the Properties palette, locate the Material parameter, and click the ellipsis button to
open the Materials dialog box. Locate and select the material named Water. Note that you
can easily find this material by typing Water in the search field at the top of the dialog
box.
10. Click OK to close the Materials dialog box; you will see the results in the 3D view, as
shown in Figure 3.32.
When you use the Subregion tool, the geometry of the original surface remains unchanged.
If you no longer need the subregion, you can select it and delete it. Be aware that topographic
surfaces cannot display surface patterns assigned to materials.

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