Autodesk AUTOCAD 2008 - PREVIEW GUIDE Technické informace stáhnout pdf (Strana 79)

Creating Surface Data | 69

You can use contour data either as breaklines or as points when you add the

contour data to the Terrain Model Explorer. When you add contour data to

the surface folder, the Contour Weeding dialog box is displayed.

When the Create as Contour Data check box is selected, the contours are

treated as breakline data, so no triangulation occurs across contours. When

the Create as Contour Data check box is cleared, the contour vertices are

treated as point data for the purposes of triangulation.

Creating Boundaries to Use in

Surface Generation

Boundaries can help eliminate certain surface editing tasks.

■ Boundaries control how the surface TIN lines extend to the outer limits of

a surface.

■ Boundaries hide internal areas of a surface.

For example, if a pond exists on the surface, you can either build the surface

and then delete the triangulation lines that cross the pond, or you can create

a boundary around the pond before building the surface so that the area of

the pond is hidden. The same applies to outer surface boundary lines. You

can either delete the TIN lines that extend beyond the survey limits after you

build the surface, or you can create a boundary around the survey limits

before building the surface.

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Autodesk AUTOCAD 2008 - PREVIEW GUIDE Technické informace Strana 79